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Home My WebLink AboutDRB130537 Project Name:VAIL BUS BARN REROOF DRB Number: DRB130537 Project Description: REROOF BUS BARN. REMOVE EXISTING, INSULATE AND REPLACE WITH 60 MIL THERMOPLASTIC ROOFING SYSTEM (GRAY COLOR TO MATCH). Participants: OWNER TOWN OF VAIL 11/06/2013 75 S FRONTAGE RD W VAIL, CO 816575096 APPLICANT STAY DRY ROOFING SERVICE LLC 11/06/2013 Phone: 719-966-4761 1727 FOUR SEASON BLVD LEADVILLE CO 80461 License: C000003416 CONTRACTOR STAY DRY ROOFING SERVICE LLC 11/06/2013 Phone: 719-966-4761 1727 FOUR SEASON BLVD LEADVILLE CO 80461 License: C000003416 Project Address:1289 ELKHORN DR VAILLocation: VAIL TOWN SHOPS BUS BARN Legal Description:Lot: Block: Subdivision: UNPLATTED Parcel Number:2101-092-0000-1 Comments:Please see conditions below. BOARD/STAFF ACTION Motion By: Action: STAFFAPP Second By: Vote: Date of Approval: 11/08/2013 Conditions: Cond: 8 (PLAN): No changes to these plans may be made without the written consent of Town of Vail staff and/or the appropriate review committee(s). Cond: 0 (PLAN): DRB approval does not constitute a permit for building. Please consult with Town of Vail Building personnel prior to construction activities. Cond: 201 (PLAN): DRB approval shall not become valid for 20 days following the date of approval, pursuant to the Vail Town Code, Chapter 12-3-3: APPEALS. Cond: 202 (PLAN): Approval of this project shall lapse and become void one (1) year following the date of final approval, unless a building permit is issued and construction is commenced and is diligently pursued toward completion. Planner:Jonathan Spence DRB Fee Paid: $250.00 0 Vail,Department of Community Development 75 South Frontage Road TOWN OF VAII CO 81657 Tel: 970-479-2128 www.vailgov.com _ Development Review Coordinator Application for Design Review Minor Exterior Alteration General Information: This application is required for all proposals involving minor changes to buildings and site improvements, such as roofing, painting, window additions, landscaping, fences, retaining walls, etc. Applicable Vail Town Code sections can be found at www.vailgov.com under Vail Information — Town Code Online. All projects requiring design review must receive approval prior to submitting a building permit application. An application for Design Review cannot be accepted until all required information is received by the Community Development Department, as outlined in the submittal requirements. The project may also need to be reviewed by the Town Council and/or the Planning and Environmental Commission. Design review approval expires one year from the date of approval, unless a building permit is issued and construction commences. Fee: $250 for Multi-Family/Commercial $20 for Single Family/Duplex Single Family Duplex Multi-Family ✓ Commercial Description of the Request: K(f — Roo-a R L.S f3 rti Rerw0 V (Y x�s�-�„� �ay�i�v Sys�c.�s. 2 ` -xSocYQNVrQT)a Fbof t ufgiIgnoN . 3.� _�,�,5, ,r Der- /csT �0 'Ile►"70rf�,5 N 'qZ1af1^Js SY,s�rw► Physical Address: 130'? E(Jr, r t�t' f l/Q r( � cc, 0 Parcel Number: Z-161 O 9 Z Ooo O I (Contact Eagle Co. Assessor at 970-328-8640 for parcel no.) Property Owner: _T_a to ni o f U Q C Mailing Address: Fu d Ll c la a fC kS Phone: Owner's Signature. 11. Primary Contact/ Owner Representative: 57'Cy Dry Rvo- A-vf S�rL scc, CL.0 Mailing Address: T r'Ao_l*kY 2 . SCtY L«No Phone: Fla - 3?L - 2 53 3 E-Mail: S 'r'�y OrY (�! Lc�,Apu,i/e Fax: 7IF- 3 9S- 13C7 For Office Use Only: Cash_ CC: Visa/ MC Last 4 CC # Exp. Date: Auth # Check# Fee Paid: Received From: Meeting Date: DRB No.: P)M � 5.337 Planner: Project No PP,:Y 13 -•QC,8,2 Zoning: Land Use: Location of the Proposal: Lot: Block: Subdivision: (A(A)PLA FrEb CxP1/t 6.0 -- l02--o �- 77 "7�o 0 PAS!1-0&3 1 FraAL srA•ruS Property Information Property Address Parcel # Z1016c12 13e q _oboe)� Legal Description Development Site Area sq ft acres buildable sq ft Zone District/SDD# Hazard Zones Snow Avalanche High Severity Moderate Severity N/A Sections 12-21 & 14-7 Debris Flow _High Flow _Moderate Flow __ High Avalanche N/A Rockfall High Severity Medium Severity _ N/A Excessive Slopes _?30% _N/A Floodplain _100 year floodplain _Floodway Wetlands _N/A Creeks, Streams _Gore Creek _on site _adjacent to site _N/A Section 12-14 17 _Other tributary: _on site _adjacent to site _N/A Project Information Project Descriription ] 7��C�rnov� °k � P�fe of- C2�45-r..Uy r4 2C��aof YItJS QrN z� �Cl/ 2�5r: 3� MSY2l( '?L'90-LC5,T 4.Q °m`1- Capt'i•v -$, ,�?�✓k Development Standards Allowed Existing Proposed Gross Residential Floor Area Primary sq ft (maximum) Chapter 12-15 Secondary sq ft EHU sq ft TOTAL sq ft 250 Addition Interior Conversion Credits: Setbacks (minimum) Front ft Section 14-10-4 Side ft Side ft Rear ft Watercourse ft Site Coverage (maximum) see definition Section 12-2-2 Building Height(maximum) Sloping ft see definition Section 12-2-2 Flat ft Landscaping Softscape sq ft See definition Section 14-2-1 Section 14-10-8 Hardscape sq ft TOTAL s ft Driveway Max Curb-cuts Sections 14-3-1 & 14-3-2 Max Grade @ centerline Min Width Heated drive? Yes No Yes No Snow Storage% Parking #Enclosed Spaces Sections 12-10& 14-5 #Unenclosed TOTAL Outdoor Lighting(maximum) #fixtures Section 14-10-7 ^ f Y• 1 / � 1 per_ sl� It # r :jff�I?ALE �ju�,2 W i ROM ST - THE PROVEN PERFORMER® fAs Chairman of the Board of Duro-Last, Inc., it is my pleasure to welcome you to Duro-Last- manufacturer of the "World's Best Roof".LA Over three decades of innovation and hard work have driven Duro-Last to become the largest manufacturer of prefabricated, thermoplastic, single-ply roofing systems in the country. We continually test and improve our products so that our customers receive high-quality materials that deliver watertight roof protection for years to come. We are also proud of our record of providing excellent service, giving our customers exactly what they need for a worry-free roof. Whether you are an architect, specifier, facility manager, property manager, building owner or contractor, we hope the information in this manual will help you understand why the Duro-Last roofing system is The Proven Performer®, with over a billion square feet of membrane installed throughout North America. We are committed to ensuring that your experience with Duro-Last is excellent. Please do not hesitate to contact me with any questions. We look forward to working with you on future roofing projects. Cordially, This Specification Manual has been prepared to provide information needed to install the Duro-Lust roofing system. Additional resources, such as elec- tronic versions of detail drawings and product data Jack Burt sheets can be obtained by visiting our web site at Chairman of the Board www.duro-last.com. If you have questions or are in need of assistance, please call us at 800-248-0280. VJ0 Spec Manual Letter 3110-MYDL25-0008 e�sr Roo`` ;INTRODUCTION: "THE WORLD'S BEST ROOF®" "THE WORLD'S BEST ROOF®" Duro-Last, Inc. is the pioneer and one of the nation's largest manufacturers of custom prefabricated roofing systems. Every Duro-Last roofing system is prefabricated in one of four Duro-Last manufacturing plants to meet your specific roofing needs. Approximately 80% of the field seams and roughly 95%of the remaining critical areas (projections and perimeters)are welded under ideal factory conditions. The result is a consistent, high quality roofing system designed and manufactured for each building on which it's installed; a concept that renders other roofing systems obsolete. The Duro-Last single-ply membrane outperforms other roofing products in all critical areas. We believe our warranties are the best in the industry Commercial projects may be eligible for (at the choice of the building owner) either a 15-year or 20-year labor and material warranty. Residential projects receive a separate 15- I year material warranty. The warranty section in this manual covers each warranty in detail. When a commercial roof installation is completed, a Duro-Last quality assurance specialist will inspect the roof for compliance with the Duro- Last specification. Upon final inspection, acceptance, and payment of all related invoices, Duro-Last will immediately issue the warranty to the Duro-Last contractor. The Duro-Last roofing system meets or exceeds major national fire and wind code requirements as well as most of the regional approvals throughout the country. Duro-Last is approved by Factory Mutual Global (FMG), Underwriters Laboratories, Inc. in both the United States (UL) and Canada (ULC), and has been evaluated by the International Code Council (ICC) and is compliant with the International Building Code(IBC). Duro-Last actively participates in the major technical committees in the roofing industry including the American Society of Testing Materials (ASTM), and the Single Ply Roofing Industry (SPRI), Cool Roof Rating Council (CRRC), and the United States Green Building Council (USGBC). In addition, Duro-Last maintains and continually updates a highly sophisticated in-house laboratory for quality control testing for all phases of manufacturing. i Duro-Last and its subsidiary companies employ more than 800 people, including 69 who are factory trained quality assurance specialists strategically located throughout the country. In addition, Duro-Last has a network of over 60 independent sales representatives based throughout North America. As Duro-Last has grown into its position of distinction, several major industrial leaders, corporations and sources of specifications throughout the country have recognized Duro-Last for its technological contributions to the roofing industry. Nationally recognized roofing experts have visited the Duro-Last facility, and have stated that its quality control procedures are the best in the roofing industry. Duro-Last was awarded the "State of Michigan New Product of the Year" award in 1986. Governor Blanchard presented Duro-Last's founder John R. Burt, with the "Small Businessman-Of-The-Year" award in 1987. In 1991, Burt was honored with the"Entrepreneur of the Year' award for the State of Michigan, and in 1997-1998, he was a finalist for this same award. Also in 1998, Burt received the"Vision of Free Enterprise"award followed by a special award in 1999, recognizing his outstanding contributions to the economy of Saginaw County. In 2003 Burt was posthumously awarded the"Excellence In Business" award by Davenport University. Duro-Last's increasing penetration into commercial and institutional sectors has generated "controlled"growth at more than twice the rate of the roofing industry. As a result, Duro-Last has made major capital improvements and investments towards increased manufacturing capacity, allowing for growth and vertical integration of manufacturing as well as improved quality control of the entire Duro-Last Roofing System. All of this translates into a roofing system that provides the consistent watertight integrity that building owners look for. By manufacturing virtually all of the components of the roofing system in its facilities, using rigorous quality-controlled procedures, and by providing the majority of the labor for"building"the roof system in it's factory, Duro-Last minimizes the liabilities commonly associated with a roofing investment. Furthermore, Duro-Last backs its claims by offering the most comprehensive warranty coverage in the industry. In short, Duro-Last, Inc. is committed to the roofing industry. Duro-Last has earned the respect of the roofing and business communities throughout North America and has assumed a leading role in roofing manufacturing technology. Duro-Last looks forward to providing the best solution to your roofing needs. 2 800-248-0280 "Duro-Last"and"The World's Best Roof are registered marks owned by Duro-Last.Inc. 2009 INTRODUCTION: FOREWORD FOREWORD j I$ This manual is intended to create a good understanding of the specifications and conditions for the installation of the 1 Duro-Last roofing system. There are hundreds, if not thousands, of different installation details, and not all can be covered. However, with a basic understanding, you will be able to accommodate almost any situation. Should you have any questions, do not hesitate to call Duro-Last, Inc. at 800-248-0280. This manual does not attempt to make judgments on whether or not an existing roof system should be removed. Nor can this manual make structural judgments for weight considerations. Use this manual as a guide for installing the Duro-Last roofing system. It will prove itself valuable in achieving an installation that will provide top-notch performance, security, longevity for the roof system and product satisfaction for the building owner. NOTES 1 The authorized contractor is responsible for following all applicable building, plumbing, electrical, and any other local codes. 2. The authorized contractor is responsible for taking core cuts and conducting pull-out tests. These tests will be used to determine fastener type and length as well as to determine the condition of the existing roof deck and the r presence of water in the existing roof system. 3. Duro-Last, Inc. does not approve of the practice of roofing over existing roof systems that contain moisture. This includes water that flows into openings created by core cuts or water that is discovered by squeezing the core sample taken from the existing roof system. Any decision to re-cover a roof containing moisture is the responsibility of both the installer and the building owner. Duro-Last, Inc. reserves the right to deny the issuance of a warranty in the instances where a Duro-last Roofing System is installed over an existing roof system that contains moisture. 4. The authorized contractor is responsible for following standard roofing practices, proper safety procedures, and compliance with OSHA, as well as all state, local, and other safety rules, regulations, and codes. It is the responsibility of the roofing contractor to obtain any building permits and insurance necessary that are above and beyond what Duro-Last, Inc. may require. 5. The authorized contractor assumes the responsibility of assuring that the installed system meets or exceeds all project specifications. For special conditions, an authorized contractor may contact the Duro-Last Engineering Services Department for assistance However, Duro-Last, Inc. is not and will not be responsible for any project specifications. 6. Duro-Last, Inc. is not responsible for any alterations to a roofing system (new or existing) which may change the thermal characteristics or dew point of the roofing assembly. 7. The sole purpose of the Duro-Last warranty inspection process is only to determine whether the Duro-Last roofing system was installed in accordance with Duro-Last's specifications. This inspection in no way extends to adjacent building components or other areas the Duro-Last quality assurance technical representative ("QA Tech Rep") may come in contact with, such as structural defects, architectural design or modifications made to the building by the installing contractor. The Duro-Last QA Tech Rep does not promote himself as knowledgeable about roofing or construction practices other than the proper installation of the Duro-Last roofing system. The ultimate goal of the inspection process is to confirm general compliance with Duro-Last, lnc's. specifications and to ensure the overall watertight integrity of the Duro-Last Roofing System. 800-248-0280 "Duro-Last"and"The World's Best Roof are registered marks owned by Duro-Last,Inc. 2009 it t I i i 40A P V O ROO Cry Duro-Last Roofing, Inc. i w d ,�.j• J, Mechanically Fastened Systems I I�Bl4t� ` SPECIFICATION e�sr o OF CONTENTS Introduction 2 Requirements 2 Tools T 2 Membrane Description 3 Applicability 3 Drainage/Slope 3 Weather Considerations 3 Delivery 3 Handling 3 Storage 3 Substrate_Separation _ 4 i Chemical Resistance 4 a Paint Application 4 Pre Job Inspection 5 j � Core Cuts 5 Pull Tests 5 Fastener Selection and Deck Types 5 Roof Preparation 8 Recover—Built-Up Roofs(BUR) 8 Recover—Single-Ply Roofs 8 _Recover—Metal Roofs Recover/Retrofit 8 New Construction 9 Installation 9 i Wood Nailer 9 ---------- Insulation Selection and Installation 10 Perimeter Membrane Installation 10 Membrane Installation 10 Hot-Air Welding 11 Flashings 11 Two-Way Air Vent 11 Roof Drains and Scuppers 11 Expansion Joints, Pitch Pans 12 Walkway Pad 12 Cautions and Warnings 12 vrwtiv.duro-last cpm ; of 12 .', 800-248-0280 'Duro-last'and"The Worlds Best Roof are registered marks owned by Duro-Last,Inc. 2009 t i TION: MECHANICALLY FASTENED SYSTEMS SECTION 1 - - - GENERAL INTRODUCTION The following is the information required to install the Duro-Last roofing system. Each installation should be in compliance with the detail drawings, instructions, material descriptions, and other information stated herein. REQUIREMENTS 1 The Duro-Last roofing system must be installed by an authorized Duro-Last contractor. 2 A Duro-Last Technical Representative must inspect the Duro-Last roofing system for compliance with the j Duro-Last specifications before a commercial/industrial warranty is issued. Note: Duro-Last does not perform destructive testing unless visual inspection necessitates a need for further investigation. 3 All materials used in the installation of the Duro-Last roofing system must be products of Duro-Last, Inc. or accepted products as defined and described in the specification. Other materials must be accepted in writing by the Duro-Last Engineering Services department prior to being used in the Duro-Last roofing system. 4 The Duro-Last contractor is responsible for following all applicable building, plumbing, and electrical codes. 5 Buildings 40-feet(12 m) or taller and/or located within high wind zones(greater than 110 mph [177 km/h])or special wind regions the following applies: a. The Duro-Last Engineering Services Department should be involved in determining the fastening requirements. Typically, the ASCE 7 Specification will be used to determine the fastening requirements. When appropriate, specifications set forth by entities such as FM Global, SPRI or State/Local Agencies i will be utilized. b. Fastening tab spacing may not exceed 60-inches(1.5 m)on center unless approved, in writing, by the Duro-Last Engineering Services Department. 6. It is the contractor's responsibility to verify the accuracy of information provided to Duro-Last, including but not limited to pull test results, building height, and roof dimensions. Measurements used during the quotation phase of a project must be checked for accuracy by the installing contractor. TOOLS The authorized Duro-Last contractor should have the following tools, which are necessary for the efficient and proper installation of the Duro-Last roofing system. • Safety Equipment(such as fall protection) • Equipment necessary to raise materials to the rooftop • Hand welders(hot-air)with a spare heating element • Silicone hand roller O tional: Automatic welder • Extension cords-cord length of 100' (30 m), #12/3 . Ground fault interrupter wire wt round • Variablespeed power screw driver with reverse . P-3 screwdriver tips for screws • Electric hammer drill w/de th gauge • R-3 s uare drive tips for concrete screws • Metal snips, hacksaw, keyhole saw, hammers, . Measuring tapes(100' and 25') (30 and 7.5 scissors, utility knives with retractable blades m), chalk line, markers, lumber crayon • 2-inch (50 mm)flat chisels, pry bar • Vise clamps, nail aprons, caulk gun, screw drivers • Tack claw • Ladders • Tars • Gri ull • Core cutter . Pull tester • Detergent-based cleaning fluid and rags • Panduit bander 800-248-0280 "Duro-Last"and"The World's Best Roof are registered marks owned by Duro-Last.Inc. 2009 i ' TION: MECHANICALLY FASTENED SYSTEMS MEMBRANE DESCRIPTION A. The Duro-Last membrane is a polyvinylchloride polymer blend, which is reinforced with a high-strength weft- inserted polyester scrim that has a thread pattern of 18 x 14 threads per inch. Refer to the Spec Data Sheets in the"Product Data Sheets"section for a listing of all of the test results and physical properties of the membrane. j 1. The 40 mil(1 mm)thick membrane has a system weight of approximately 0.25 lb/ft'(1.22 kg/m2). The prefab- ricated roof cover is supplied in sections that are either folded or rolled. Individual sections may be as large as 2,500 ft2 (232 m2), with no single dimension exceeding 100-ft(30 m). Deck sheets can be fabricated up to 3,000 ft2(279 m2)when using 10-ft(3.05 m) laps, 30'-6"(9.3 m)wide with a full reverse, not to exceed 100-ft(30.5 m) I long. 2. The 50 mil (1.27 mm)thick membrane has a system weight of approximately 0.32 lb/ft2 (1.56 kg/m2). The prefab- ricated roof cover is supplied in sections that are either folded or rolled. Individual sections may be as large as 2,000 ft2(186 m2), with no single dimension exceeding 80-ft(24 m). Deck sheets can be fabricated up to 2,500 ft2 (232 m2)when using 10-ft(3.05 m) laps, 30'-6" (9.3 m)wide with a full reverse, not to exceed 80-ft(24.4 m) long. 3. The 60 mil(1.52 mm)thick membrane has a system weight of approximately 0.39 lb/ft' (1.9 kg/m2). The prefab- ricated roof cover is supplied in sections that are either folded or rolled. Individual sections may be as large as 1.500 ft2 (139 m2), with no single dimension exceeding 60-ft(18.28 m). APPLICABILITY The Duro-Last roofing system consists of the Duro-Last membrane, fasteners, prefabricated corners, parapet flashings, stack flashings, curb flashings, two-way vents, and other related Duro-Last approved products. The Duro- Last roofing system consists of products manufactured by Duro-Last, Inc., or accepted products as defined and described in the specifications. Alternate materials must be pre-approved in writing by the Duro-Last Engineering Services Department prior to their use with the Duro-Last roofing system. Drainage/Slope Duro-Last warrants its membrane even where ponding water accumulates. Duro-Last has found no adverse effects on its membrane because of a lack of positive drainage, however, good roofing practices incorporate the use of positive drainage for the safety of the structure. The installing contractor is responsible to make sure roof drainage meets local building code requirements. WEATHER CONSIDERATIONS The Duro-Last membrane is designed to perform in all types of weather. The Duro-Last membrane is regularly subjected to DSET, EMMAQUA Exposure and low temperature cracking (ASTM D-2136)testing. Installation of the Duro-Last membrane is limited only by the exposure limitations of the installers. It is Duro-Last's recommendation that installation be performed within the temperature range of—15 to 115°F (-26 to 46°C). DELIVERY The Duro-Last roofing system and related materials will be delivered to the location designated by the Duro-Last contractor in the original packaging and with shipping labels intact. Containers will be labeled with manufacturers/supplier's name, product name, and identification. Each shipment should be checked for damages and/or shortages at the time of delivery. The freight agent must note damaged materials and/or shortages on the freight bill. Concealed damage must be reported to the freight agent immediately. Materials damaged in shipping, handling, or storage cannot be used. HANDLING Once the Duro-Last roofing system is delivered, the contractor and contractor's crew are responsible for all handling and installation of the roofing system. Adequate personnel and equipment should be available to safely lift and place the Duro-Last roofing system onto the rooftop. Folded or rolled prefabricated sections of membrane must be placed on the roof near load-bearing members, and in a manner convenient to final placement. 800-248-0280 'Duro-Last"and"The World's Best Roof are registered marks owned by Duro-Last,Inc. 2009 �' SPECIFICATION: MECHANICALLY FASTENED SYSTEMS ! STORAGE Duro-Last materials should be kept clean and dry. Materials should be stored on pallets and covered with tarps. Care should be taken to place materials away from areas where water may pond or areas that water falls onto from higher elevations. All sealants must be stored at temperatures above 40 °F(5 °C). Keep combustible materials away from heat, sparks, and open flames. Follow precautions outlined on the containers or supplied by the material manufacturer SUBSTRATE SEPARATION The Duro-Last membrane is defect-free when it leaves the factory. Certain substrates are not compatible with the Duro-Last membrane and may cause premature failure of the membrane. Over the substrates listed below, install a minimum 3 mil polyethylene or polypropylene slip sheet prior to the installation of the Duro-Last membrane. Acrylic Coatings _ Extruded Polystyrene Modified Bitumen Shingles Aluminum Coated Asphalt Granulated Cap Sheet Old Duro-Last Roofs TPO(Thermoplastic Pol olefin Coated or Smooth Asphalt Hypalon CSPE Polyurethane Sprayed Urethane Foam Expanded Polystyrene Mineral Surfaced Cap Coal Tar Pitch PVC/CPA Membranes The Duro-Last membrane is compatible with the following substrates, and no separation is required. CPE Roofing GP DensDeckTm and DensDeckTM Primed Glass Fiber Board Cellular Glass Boards Pol isoc anurate Insulation Boards EPDM(clean) Lightweight\Structural Concrete Decks Wood Decks Smooth Gypsum Smooth Pre-stressed Concrete Decks CHEMICAL RESISTANCE Duro-Last membrane is resistant to the chemicals listed below. If any other chemicals are present on a particular roof, please contact the Engineering Services Department. Acrylic Paint Linseed Oil Copper Sulfate Lard (Animal Fats) Latex Paint Masonry Cleaner Ferric Chloride Phosphoric Acid Fertilizer Solution Muriatic Acid ------Fiberglass Mat Polypropylene Fruit Juice Oleic Acid Furnace Residue Zinc Chloride Hydrogen Peroxide Sodium Hydroxide Detergent Solution Bleach PAINT APPLICATION The Duro-Last membrane may be painted, although vinyl edging may not be painted. See the Chemical Resistance section for approved paint types for the membrane. If the vinyl edging is painted and causes damage to the edgings, Duro-Last Roofing, Inc. will not be held responsible for repair or replacement under the warranty. Should you have any questions, please contact the Duro-Last Quality Assurance Department. iE i 3 6 800-248-0280 Duro-Last'and"The World's Best Roof are registered marks owned by Duro-Last,Inc. 2049 TION: MECHANICALLY FASTENED SYSTEMS SECTION 2 - -- QUALITY ASSURANCE I PRE-JOB INSPECTION When recovering an existing roofing system, the authorized Duro-Last contractor is responsible to conduct an inspection of the proposed job site roof conditions to determine the needed fastener type and length, evaluate the moisture content of the existing roofing system, and to note damaged areas to be repaired prior to installation of the Duro-last roofing system. CORE CUTS 1 The Duro-Last contractor is responsible for performing a series of core cuts to determine and verify the above information. The Duro-Last contractor and/or building owner is responsible for the repair of all core cuts. 2 Duro-Last, Inc. does not approve the practice of roofing over existing roofing systems that contain excess moisture. Excess moisture is defined as water observed within a core cut or water squeezed from the core sample taken. i 3 Duro-Last's post-installation warranty inspection does not check the moisture content of the substrate. PULLOUT TESTS 1 Fastener pullout tests must be conducted on the roof deck with approved fasteners to verify the integrity of the deck and to establish fastening patterns that meet the requirements of Duro-Last specifications. Contact the Duro-Last Engineering Services Department with any questions. 2 It is the responsibility of the Duro-Last contractor to make sure pullout tests are performed on site. The tests can be performed by either the fastener manufacturer or the authorized Duro-Last contractor. The sections of decking where integrity is in question should be the locations for the tests. The pullout tests must be documented on a roof drawing showing the location and pullout value of each test. In situations where new construction prevents on-site pullout tests, a pre-assembled deck representing the proposed deck type should be constructed and tested. 3 The number of pullout tests required will be as follows: perform a minimum of 10 tests for up to 50,000 ft1 (4,645 m1)and five additional pull tests for each additional 50,000 ft1 or portion thereof, on each project. Areas of low pullout results will require additional pullout tests. 4 It is the responsibility of the Duro-Last contractor to verify pullout values prior to installation. FASTENER SELECTION AND DECK TYPES The fasteners used to attach insulation, recover board and Duro-Last membrane must be supplied by Duro-Last, Inc. The following tables summarize the appropriate fasteners to use for different deck types and system components. If a fastener type is needed that is not listed below, the Duro-Last Engineering Services Department must approve its use, in writing, prior to installation. Plate Selection When determining which plates to use and where to use them, refer to this table. 2-inch {50 mm} 2.4-inch (61 mm} 3-inch (76 mm) Insulation Plate Poly-Plate Cleat Metal Plate S u ire Metal Plate Membrane Fastening Fastening Tabs Yes Yes No' No Parapet Flashings Yes Yes Yes No Base of Walls/Penetrations Yes Yes Yes No Insulation Boards Yes Yes Yes Yes Cover Boards Yes Yes Yes No Allowed by deviation only or on the Duro-Roof system. 800-248-0280 "Duro-Last"and'The World's Best Roor are registered marks owned by Duro-Last,Inc. 2009 I SPECIFICATION: MECHANICALLY FASTENED SYSTEMS Fastener Selection Based on Deck Type When determining which fastener type to use for a specific deck type, refer to this table. Note that pullout tests must be performed on each deck and that fastener spacing must be determined based on the"Fastener Spacing Tables'on the following page. If the minimum pullout values required cannot be achieved contact the Duro-Last Engineering Services Department for assistance. q Deck Type Fastener Type Notes Steel Duro-Last HD Screws Must penetrate a minimum of 1-inch (25 mm) from Duro-Last XHD Screws the top surface of deck. Wood Duro-Last HD Screws Must penetrate a minimum of 1-inch (25 mm)from Duro-Last XHD Screws the top surface of deck. Structural Concrete Duro-Last Concrete Nail Must penetrate a minimum of 1-inch (25 mm)from Duro-Last Concrete Screw the top surface of deck. Pre-drill a minimum of Duro-Last HD Screws 112-inch (12.7 mm)deeper than the required Duro-Last XHD Screws depth of the fasteners using a 3/16-inch (5 mm) bit Gypsum Auger Fastener* Minimum pullout requirements must be met. See Liquid Auger Fastener** "Fastener Spacing Tables', page 7. Pre-drill required for auger fasteners. Use a 7/16- 9/16-inch 11 — 14mm bit. *Must penetrate a minimum of 1-1/2-inch (38 mm)from the top surface of deck. *Factory Mutual designed systems require minimum of 2-inch(50 mm) penetration. ** Liquid Augers must penetrate a minimum of 2- inch (50 mm)from the top surface of the deck. Cementitious Wood Auger Fastener* Minimum pullout requirements must be met. See Fiber(Tectum) Liquid Auger Fastener— "Fastener Spacing Tables'; page 7. Do not pre-drill. * Must penetrate a minimum of 1 1/2-inch (38 mm) from the top surface of deck. * Factory Mutual designed systems require minimum of 2-inch 50 mm penetration. ** Liquid Auger must penetrate a minimum of 2- inch 50 mm beyond the top surface of the deck. Lightweight Auger Fastener* Minimum pullout requirements must be met. See Concrete Liquid Auger Fastener** "Fastener Spacing Tables", page 7. Duro-Last Concrete Screw Pre-drill required. Duro-Last Concrete Nail Augers: Use a 7/16-9/16-inch (11 — 14 mm) bit. Duro-Last HD Screws Others: Use a 3/16-inch 5 mm bit. Duro-Last XHD Screws *Must penetrate a minimum of 1-1/2-inch (38 mm)from the top surface of deck. *Factory Mutual designed systems require minimum of 2-inch (50 mm) penetration. ** Liquid Auger must penetrate a minimum of 2- inch 50 mm from the top surface of the deck. Walls and Curbs Notes Cinder and Zinc Plated Metal Anchors Must penetrate a minimum of 1-inch (25 mm)from Concrete Block Duro-Last Concrete Screw the top surface. Pre-drill a minimum of 1/2-inch Duro-Last Concrete Nail (12.7 mm)deeper than the required depth of the Duro-Last HD Screws fasteners using a 3/16-inch (5 mm) bit(1/2-inch Duro-Last XHD Screws 12.7 mm for metal anchors). 800-248-0280 'Duro-Last'and*The World's Best Roof are registered marks owned by Duro-Last,Inc. 2009 FICATION: MECHANICALLY FASTENED SYSTEMS FASTENER SPACING TABLES'—FOR USE WITH ALL DECK TYPES 1 Fastener Spacing Along Laps 1. For buildings 40-feet(12 m) Fastener Pullout 120-inch or taller and/or located within Resistance Lap 60-inch Lap 28-inch Lap high wind zones (greater than m Spacing Spacing Spacing 110 mph [177 km/h])or @ lb. I N in. mm in. mm in. mm special wind regions; r 450 2000 9 230 j 18 457 24 610 a. The Duro-Last .m c 375 I 1670 6 230 15 380 18 455 Engineering Services d O 350 1550 6 150 1 15 380 18 455 department should be E0 325 1445 6 150 I 12 305 18 455 involved in determining -0 300 1330 6 150 l 12 305 18 455 the fastening rn v requirements. The ASCE N iZ 275 1220 N.A. 12 305 18 455 7 Specification will be 225 1000 N.A. 9 230 18 455 used to determine the oa 210 930 N.A. 6 150 18 455 fastening requirements. CO 175 780 N.A. 6 150 15 380 When appropriate, speci- I 150 665 N.A. 6 1 150 15 380 fications set forth by 140 620 N.A. N.A. 12 305 entities such as FM Less than 140 620 N.A. N.A. N.A. Global, SPRI State/ Local Agencies will be utilized. Fastener Spacing Along Laps b. Fastening tab spacing Fastener Pullout 120-inch may not exceed 60 in. Resistance Lap 60-inch Lap 28-inch Lap (1.5 m)on center unless S �acing Spacing Spacing approved, in writing, by Ib. N in. in. mm in. mm the Duro-Last Engineering c 450 2000 6 12 305 18 455 Services department. wO o (0 375 1670 N.A. 9 230 18 455 The tables to the left indicate the 350 1550 N.A, 6 150 18 455 membrane fastening within the -0 325 1445 N.A. 6 150 18 455 FIELD AREA only. Membrane 300 1330 N.A. 6 150 15 380 attachment on Duro-last de- signed roof systems, buildings in w 275 1220 N.A. 6 150 15 380 special wind regions or those 40- a 225 1000 N.A. 6 150 18 455 � feet or taller, and all Factory 210 930 N.A. N.A. 12 305 Mutual-insured buildings will 175 780 N.A. N.A. 9 230 require special field, perimeter, Less than 175 780 N.A. N.A. N.A. and corner fastening. The width of the perimeter area Pullout values greater than 450 ibs can only be used with the Duro-Root system, is determined by the either the lesser of 40%of the building height at the eaves or 10% of the overall plan width of the building and/or roof area. The perimeter must never be less than five-feet wide. Contact the Duro-Last Engineering Services department for additional information. 800-248-0280 "Duro-Last and"The World's Best Roof are registered marks owned by Duro-Last.Inc 2009 N: MECHANICALLY FASTENED SYSTEMS SECTION 3 - - - IMPLEMENTATION ROOF PREPARATION RECOVER—Built-up Roofs(BUR) i s a. If the BUR is gravel surfaced and the pea gravel or crushed stone is 1/4-3/8-inch (6- 10 mm) in size, it must be leveled and maintained at 4 lb./ft' (20 kg/m'). A minimum 3/8-inch (10 mm)fan fold board, supplied by Duro-Last, approved recover board, or 1-inch (25 mm)thick insulation must be used to overlay the gravel b. If the loose stone on an old BUR is vacuumed or swept, A minimum 3/8-inch (10 mm)fan fold board, supplied by Duro-Last, approved recover board, or 1-inch (25 mm)thick insulation must be used to overlay the existing system. CAUTION: Removing more than the loose gravel may affect the fire rating. Contact the Duro-Last Engineering Services Department for assistance regarding fire rated assemblies. c. If the BUR is a smooth or granular surfaced application, and is free of sharp edges and debris, it can be recovered with a minimum of a 3 mil polyethylene slip sheet, though Duro-Last fan fold board is recommended. d. EPS insulation cannot be used over coal tar pitch or asphalt without a slip sheet between the coal tar pitch and the insulation as well as between the membrane and the insulation. Duro-Last underlayments are approved for direct application over aged coal tar pitch roofs. e. When roofing over asphalt or coal tar roofs(including tear-off), an approved separator sheet must be used. Asphalt-based products are incompatible with the Duro-Last roofing membrane. Note: Should the Duro-Last membrane become soiled with roofing asphalt, the affected membrane must be cleaned immediately using approved cleaners and procedures. If the asphalt cannot be properly cleaned from the membrane, the affected membrane must be removed and new membrane installed, or overlay the affected area with an approved slip sheet and new membrane. Extreme caution should be taken if you are doing a tear-off while installing the membrane. RECOVER—Single-Ply Roofs a. The existing single-ply roofing membrane must be cut free from the entire roof perimeter, cut free around all penetrations, and cut in between fastener rows prior to the installation of the Duro-Last membrane. When reroofing after a tear-off, caution should be used to prevent the Duro-Last membrane from contacting incompatible materials. (See"Substrate Separation", page 4) b. If the existing system is mechanically fastened, there is often a problem with loose fasteners. Because of this problem, cut the membrane open and remove all loose fasteners before installing the slip sheet_ c. If a PVC membrane has been installed directly over styrene insulation without a separation sheet, then the old membrane must be removed, damaged insulation replaced, and an approved slip sheet installed. d. If the existing membrane is ballasted and the Duro-Last membrane is to be mechanically fastened, it is necessary to do fastener pullout tests on the deck. Also, the type of insulation and its density needs to be determined to ensure that the insulation will meet the Duro-Last specification. (See"Substrate Separation", page 4). Be aware that if the existing insulation is"loose-laid" it must be fastened with an approved fastening pattern (See Detail 1020). RECOVER—Metal Roof Recover/Retrofit a. The metal roof panel must be clean, smooth, and free of sharp edges and loose foreign material. Damaged areas and other factors affecting the installation of the Duro-Last roofing system must be repaired prior to the installation of the membrane. b. A metal roof panel must be separated from the Duro-Last membrane by using a recover board of at least 7/16-inch thick (11 mm) hardboard (gypsum), plywood, or oriented strand board (OSB)or 1-inch (25 mm) rigid insulation. When 1-inch rigid insulation is used, flute filler must be used and must consist of polyisocyanurate insulation. Note: According to international Building Code(IBC), the use of above-deck 800-248-0280 "Duro-Last"and"The World's Best Roof are registered marks owned by Duro-Last,fnc. 2009 I 3 TIO : MECHANICALLY FASTENED SYSTEMS thermal insulation(including extruded or expanded EPS) is covered with an approved roof covering and passes the tests of FM 4450 or UL 1256 when tested as an assembly. The gaps between the ribs of the metal and the insulation fill cannot exceed the recover board manufacturer's recommendation for spanability. Flute filler must be fastened as needed to hold the flute fill in place. (Note: Duro-Last fanfold may be used if the flutes are filled with no gaps exceeding 1/4-inch total in between metal ribs.) c. Insulation/recover board must be neatly fitted to the roof deck and its penetrations. Four by eight-feet (1.2 x 2.4 m)boards must be attached with a minimum of five fasteners/distribution plates. See details 1020& 1030 found in the detail section of this manual for mechanical attachment of additional sizes of recovery boards. Gaps between insulation/recovery boards cannot exceed 114-inch (6 mm) in width. No more insulation/recovery board will be installed than can be covered with membrane and completed before the end of the day's work or before the onset of inclement weather. Duro-Last fasteners and plates as well as approved fastening patterns are required for attachment of all insulation/recover board. Contact the Duro-Last Engineering Services Department with any questions. d. High-density wood fiberboard is acceptable on metal building recovers when the building slope is at least 1-inch (25 mm)vertical for every 12-inches(305 mm) horizontal. High-density wood fiber will not be accepted as flute filler. e. Plywood is acceptable to recover metal roofs. The minimum thickness, if it is being used as recover board, shall be 7/16-inch (11 mm). Fasteners must penetrate through both the plywood and the existing metal roof f. If plywood will be acting as the new substrate for membrane attachment, the plywood must be a minimum of 9/16-inch (14 mm)thick and a pull-test must be conducted on the new lumber to determine the proper lap spacing and attachment along the tab. Contact the local building authority to determine compliance of deck attachment to the building structure. Note. It is the responsibility of the contractor to ensure that the weight requirements of the building are not exceeded when installing additional materials over pre-engineered buildings. NEW CONSTRUCTION a. All concrete surfaces must be troweled smooth. If the concrete surface is not smooth, a minimum 3/8- inch (10 mm)fan fold board, supplied by Duro-Last, is required. b. The roof deck or existing roof system must be clean, smooth, free of sharp edges, and loose foreign material. Damaged areas and other factors affecting the installation of the Duro-Last roofing system must be repaired prior to the installation of the membrane. c. A metal deck must be separated from the Duro-Last membrane by at least 7/16-inch (11 mm) hardboard (gypsum, plywood, or oriented strand board) or 1-inch (25 mm) rigid insulation. It is the responsibility of the contractor to ensure that the selected insulation is adequate to span the flutes of the deck. If it is not, the flutes must be filled with an approved insulation See"Insulation Selection and Installation"for further details. d. All plywood surfaces must be smooth and free of all foreign material. Gaps between sheets of plywood should not exceed 1/4-inch (6 mm). Prior to the installation of the membrane a slip sheet such as geotextile, 3-mil polyethylene film or duct tape must be installed over any H-clips if they are used on any plywood decking. INSTALLATION WOOD NAILER Wood nailers must be a#2 grade lumber, or better and must be fastened to the deck, wall or existing secured nailer in such a manner that they resist 180 lb. of force per linear foot(2,643 N/M) of nailer in any direction. Fasteners used to attach wood nailers must be spaced no greater than 18-inches (455 mm)apart. Wood nailers are required in any situation where 1-inch(25 mm)or greater of insulation is added to the roof perimeter edge. The top of the nailers must be flush with the top of the insulation. Wood nailers are not required at a change of plane such as the intersection between a parapet wall and the decking. 800-248-0280 Turo-Last*and"The World's Best Roof are registered marks owned by buro-last,Inc. 2009 i f j it I SPECIFICATION: MECHANICALLY FASTENED SYSTEMS E Duro-Last Engineering Services requires that for nailers and other lumber supports identified as ACQ or CA I treated, only stainless steel fasteners be used. Additionally,for all new construction, untreated lumber should be E used for nailers with standard e-coated fasteners. Further, treated lumber dating 2003 or earlier is acceptable for use with e-coated fasteners as lumber prior to 2003 of age is unlikely to contain the copper based treatments. E INSULATION SELECTION AND INSTALLATION Insulation products must be neatly fitted to the roof deck and its penetrations. 4 x 8-feet(1.2 x 2.4 m) insulation boards must have a minimum of five fasteners/distribution plates installed per board. No gap should exceed 1/4- inch (6 mm) in width. No more insulation products should be installed than can be covered with membrane and completed before the end of the day's work or before the onset of inclement weather. Duro-Last fasteners and Duro-Last plates as well as approved fastening patterns are required for attachment of all insulation products. The minimum compression characteristics of insulation products as determined by ASTM D-1621 will be as follows: • Polyisocyanurate products: 20 psi (137.8 kPa) • Fiberglass products: 16 psi (110.3 kPa) • Extruded polystyrene products: 25 psi (172.3 kPa) • Expanded polystyrene products: 15 psi (124.1 kPa) and 1.5 pcf(24 kg/ma)density (certified)and a {� minimum 1-inch (25 mm)thick. } s • Expanded polystyrene products covered with or laminated to a hardboard facer: 12 psi (82.7 kPa)and 1.25 pcf(20 kg/m3)densities and a minimum of 1-inch (25 mm)thick. PERIMETER MEMBRANE INSTALLATION a The first fastening tab on all perimeter roof sections that have tabs parallel with the roof edge or parapet wall, must be between 24- 36 inches(610-915 mm)from the edge or the wall. If the parapet wall is greater than 24-inches(610 mm)tall, the perimeter tab may be placed up to 63-inches(1.6 m)away from the roof edge when utilizing roof sections with maximum lap spacing of 60-inches(1.5 m)on center. b. When using roof sections with fastening tabs spaced 120-inches(3 m), the first tab along all perimeter roof edges must be located 24 - 36-inches(610—915 mm)from the edge. The second tab must be placed 84-96-inches(2130—2440 mm) from the edge. Parapet wall height does not change this requirement. c. On buildings with multiple roof levels, treat all roof edges as perimeter edges if they stand 3-feet(915 mm)or more above adjacent or surrounding roof areas. d. On buildings located in high wind zones(greater than 110 mph [177 km/h])or on structures that are 40- feet(12 m)or taller, additional wind tabs and/or increased fastener density may be required. Contact the Duro-Last Engineering Services department for assistance. MEMBRANE INSTALLATION a. The prefabricated roof section is unrolled and positioned on the deck to expose the first securement tab. The securement tab is mechanically fastened to the deck with approved fasteners and stress distribution plates(see"Fastener Selection and Deck Types", page 6). The roof section is then unfolded and pulled taut to remove any wrinkles exposing the second securement tab. This process is repeated until the entire roof section has been mechanically fastened to the deck, including all securement tabs and edges. The next section of roofing membrane is then positioned to provide a minimum 6-inches (152 mm)overlap. The above procedure is repeated for each roof section. b. The edge of the stress distribution plate must be installed flush with the outside edge of a fastening tab. c. The maximum fastener spacing is 18-inches(457 mm) on center in rows 60-inches (1.5 m)apart. For tab spacing greater than 60-inches (1.5 m), the maximum fastener spacing is 12-inches(305 mm)on center. (Refer to the Fastener Spacing Table, page 7.) 800-248-0280 "Duro-Last"and"The World's Best Roof are registered marks owned by Duro-L"t,hr. 2009 CIFICA'TION: MECHANICALLY FASTENED SYSTEMS d When installing membrane, ensure that the appropriate side of the membrane is exposed to elements. For white and gray membrane, the smooth side should be exposed. On the tan membrane, it will be the embossed side of the membrane that should be exposed. e. If the membrane is attached to the support structure beneath the roof deck, special precautions must be taken. If the membrane is attached to a steel purlin structure, all fasteners must penetrate a minimum of 1-3/4-inch (44 mm)from the top of the purlin using Duro-Last purlin fasteners. If the membrane is being attached to a wood truss structure, all fasteners must penetrate a minimum of 1-inch (25 mm)from the top surface of the truss with approved Duro-Last fasteners. HOT-AIR WELDING a. Position the membrane so that the top membrane overlaps the bottom membrane a minimum of 6-inches (152 mm). Ensure the welding area is dry, clean and free of foreign material. b. Weld the top membrane to the bottom membrane using a hand-held welder or an automatic welding machine, and silicone roller. A minimum 1-1/2-inch (38 mm)wide continuous weld is required. c. All field-welded seams must be inspected with a tack claw or similar tool (cotter key extractor), and all deficiencies repaired prior to inspection by Duro-Last. FLASHINGS a. The Duro-Last membrane must not contact surfaces which maintain or exceed temperatures of 120°F including all insulated chimney pipes, exhaust pipes, and combustible fuel pipes. b All flashings must be terminated at a minimum of 8-inches (203 mm)above the roof surface. c. See`Mechanically Fastened"details section for installation references. TWO WAY AIR VENT a. Install Duro-Last Two-Way Air Vents following these guidelines: 1. Install at a rate of one vent for every 1,000 ftz of deck area. 2. Do not install the vents near drains or in valleys. 3. Evenly space the vents across the roof area and center them between fastening tabs. b. It is the contractor's responsibility to ensure that adequate secondary drainage exists to prevent flooding during extreme weather when water could infiltrate the two-way vent. c. See Details 5020 for installation references ROOF DRAINS AND SCUPPERS a Drain Assemblies with Clamping Rings 1. All existing roofing materials must be removed from drain bowl and clamping ring. 2 Use Duro-Caulk Plus between the membrane and clamping ring (1/2 tube minimum). 3. After the Duro-Last membrane is properly installed onto the bowl and the clamping ring set in place, all bolts securing the ring must be installed to provide constant, even compression on the sealant. If bolts are broken or missing, replacements must be installed. 800-248-0280 'Duro-Last'and"The World's Best Roof are registered marks owned by Duro-Last.Inc. 2009 I 5PECIFICATION: MECHANICALLY FASTENED SYSTEMS b. Duro-Last Drain Boots 1. If the Duro-Last drain boot is to be used, apply one-half(1/2) tube of sealant minimum to the outside of the drain boot and insert it into the drain. 2. Install composite compression drain rings as low into the drain as possible. c. See Details 2011, 2020, 2021, 2025, 2030, 2041, 2050, 2060, 2061, 2070 and 2071 for installation references j I EXPANSION JOINTS a See Details 1140, 1150, 1160, 1170 and 6160 for installation references. PITCH PAN a. Use pitch pans only when standard Duro-Last flashings cannot be used. b. Only Duro-Last Duro-Caulk Plus or approved sealer may be used when creating a pitch pan. c. See Details 4030,4040 and 4045 for installation references. WALKWAY PAD a. Duro-Last Roof Trak III Walkway Pad is recommended at all roof access points, service units and high traffic areas. The risk of potential third party damage to the Duro-Last roofing system may increase should the building owner choose not to utilize the Duro-Last Roof Trak III Walkway Pad. Note: Prior to inspection of the installation by Duro-Last, attach only one side of any Walkway Pads that will be covering any field seams. This will allow the Duro-Last Technical Representative to inspect the entire field seam. After the inspection, hot-air weld the remaining side to complete the attachment of the pad. CAUTIONS AND WARNINGS 1 Duro-Last Roofing, Inc. is not responsible for damage that may occur as a result of moisture created from condensation occurring within or beneath a roof deck subassembly or building. 2 All Polystyrene insulation (Styrofoam, Formular, Dow, EPS, etc. -blue, white, gray, green, or pink)must have an approved non-styrene facer or a 3 mil polyethylene slip sheet covering when installed in direct contact with existing or new PVC membranes. Polyethylene or polypropylene facers are acceptable only after testing. and approval by Duro-Last for compatibility. 3 Phenolic foam is not an approved insulation in new construction or re-roofing applications. The Duro-Last roofing system may not, under any circumstance, be installed over phenolic foam. 4 Perlite and wood/mineral fiber-boards are not acceptable substrates for the Duro-Last membrane. (See#5 below for exception on wood fiber board) 5 High density wood fiber boards are only acceptable on a metal roof that is being retrofitted where the slope of the roof will be 1-inch (25.4 mm) per 12-inch (305 mm) slope or greater. 6 If asbestos is encountered, the building owner must be notified at once. The owner is solely responsible for determining the proper course of action. 7. A Duro-Last roof shall not be installed over areas of roofs if one or more of the following conditions exist. a. The building structure is not sufficient to handle the load of the completed system. b. It is not possible to find an approved fastener that will properly hold in the substrate. c. Roofs are subject to hot embers, slag, or burning debris. d. Incompatible chemicals exhausted directly onto the roof or may come in contact with the roof in liquid form. (See"Chemical Resistance page 4) e. Steam is exhausted directly onto the roof that is in excess of 120° F (49°C). -z; 800-248-0280 'Duro-Last°and'The World's Best Roof are registered marks owned by Duro-Last,Inc. 2009