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Home My WebLink AboutB10-0027 chimney reconstruction letter 2010-05-03Rod Hcail Company F/REPL4CE5 + GAS LOGS • GRS 6RlLLS � ATT/C FANS PR�FESSIONAL JIVSTA�LAT/ON 255 Wyandot St. Denver, CO 80223 PHONE: (303) 777-7700 FAX: (303) 777-1169 May 3, 2010 To: Chris Gunion Vail Building Department Re: Antlers Chimney Reconstruction Contractor. J.L. vele Permit # 610-0027 Dear Chris, 1 [�C�L�[i�/I[� MAY � 4 2010 /i(i TOWR� 0�= �"��L � We have been asked to provide the materials and installation of new fireplace chimney covers for the Antlers Condominium project in Vail. One of the stipulations for providing the new product requires that the chimney covers comply with the Intemational Fuel Gas Code, section 503.5.4 which reads in part "decorative shrouds shall not be installed at the terntination of factory�built chimneys except where such shrouds are listed and labeled for use with the speciic factory-built chimney system and are instal/ed in accor�dance with the manufacturers installation instructions." There are several mitigating circumstances with this project which require additional consideration. The first is that the factory-buitt fireplace manufacturer, Pr+eway, is no longer in business. Secondly, the existing flues require terminafion caps which are currerrtly missing. Third, all of the fireplaces except one have been converted to gas-buming appliances. Fourth, the structure above the fireplace chase is a cover, and not a shroud. Shrouds typically have closed sides to hide or `shroud' the vent teRninations. In this instance all the flues are completely exposed. We have researched and reviewed the shroud requirements of other manufacturers such as Simpson DuraVerrt and compared their UL listed designs to those of this project. We have evaluated the clearances for designs that approximate the irrtentions for this project and have found what we consider to be acceptable conditions. In fact, the new design of chase covering provides improved conditions compared to the existing structure. We have consulted with American Chimney Shroud, a leading manufa�turer of listed shrouds. They have concurred with our assessment that the new design of chase oovers will meet and/or exceed the requirements for a safe and functionaF fireplace system. I have attached a copy of their letter for your review. Since we cannot speak with the fireplace manufacturer we are requesting that, under the currerrt circumstances as outlined above, you witl consider the installation of the new chimney caps and covers to have been thoroughly evaluated and safe for this intended application. Sincerely, .�..�%aH.� �� Dave Hall T� �� Rod Hall Company �� .� ., � �� (� — c�C�Z� 26401 Via De Anza, San ]uan Capistrano Ca. 92675 Ph. 949-364-5118 Fx. 949-364-5478 emaii@acs.com Custom Chimney Shrouds • Bonderized Steel • Copper • Stainless Steel To: Vail Building Department Re: Antlers Chimney Refurbishing To whom it may concern, American Chimney Shroud Inc, has been asked to supply Colorado Comfort Products with custom chimney products for the Antlers Condominium project in the Vail Building Deparhnent's jurisdiction. Being one of very few UL approved decora.tive chimney cap manufacturers in the country has given American Chimney Shroud an unpaxalleled expertise with safe chimney configurations. Unfortunately, in this situation the The ICC (International Commercial Code) R1004.3 stating that "Decorwtive chininey shrouds should not be installed at the termination of air cooled chimneys for factory built fireplaces e.xcept where the shrauds are listed and labeled for use with the specific jactory built fireplace systein and installed in accordance with manufacturers i�rstulla�ion insd�udions" can not be "precisely" satisfied. However, logically and reasonably, this standard can be met, considering the fireplace and flue manufacturer in question has been defunct for almost two decades, and many identically engineered fireplace and chimney products still remain on the market that do offer specifications for UL approved custom tops. American Chimney Shroud has laboratory tested to these specifications and is therefore preferred and recommended by the current flue manufacturers as a source for custom chimney tops. Moreover, in regard to the actual architectural design, the chimney cover will in no way hinder or even affect the function of the fireplace systems involved. The lid will sit several feet off the top of the chase, and is completely open and frce flowing around its perimeter. The lid will also include an open top maintaining complete and free air flow around all dimensions of the fireplace flues. The new caps in question will be a significant improvement in design, quality and safety over the existing site conditions. Thank you for your consideration in this matter, Gavin Peterson American Chimney Shroud, Inc. American Chimney Shroud, Inc. �� 4/24/10 Dave Hall Rod Hall Company 255 Wyandot St. Denver, CO 80223 BELFAY ENGIN�ERING Mechanical & Electrical Consulting Engineers 2811 West 9'" Ave. TEL: (303) 892-5980 Denver, CO 80204 FAX: (303) 892-5979 email: belfay@beffay.com Project: Antlers Chunney Reconstruction Subject: Review of Proposed Design Dave, Field construction of chimney shrouds is acceptable, if constructed in accordance with the chimney manufacturer's specifications. Since the original chimney manufacturer, Preway is no longer in business, I have researched 2 cutrent chimney manufacturers; Selkirk and Dura-Vent. found the shroud construction requirements for each manufacturer were identical. On page 3 of the Dura-Vents publication L157, the following is stated: "A shroud built and installed in compliance with these instructions is LTL listed for use with DuraTech chimney (listing number MH7399)." Therefore I conclude that if the shrouds on the subject project are construc�ed in accordance with Dura-Vent's requirements, the shroud will be UL listed for the application, and the intent of 2006 IFGC 503.5.4 is sa.tisfied. After reviewing and performi.ng area calculations on the proposed shroud design drawing (see attached), I find the proposed chimney cover design in compliance with the shroud requirements from Dura-Vent publication L157, dated 10/2007. Please find my calculations attached. When the construction is complete, the chimneys will be in compliance with the 2006 IFGC, and be demonstrably safer than the existing conditions. Respectfully bmitted, f David Bellefeuille, PE President Belfay Engineering, PC Attachments. Dura-Vent Publication L157 PrOposed Shroud Drawing. Shroud Area Calculations. �£�o: ' 7a �: ;�• _�,��. 3 /v :. . Ssee •�a ,��i�.,,. �'i � t� ,�; 46 Antlers Chimney Cover design specifications Rod Hall Company 303-777-7700 Open Ridge Vent 24 ga; Painted Steel Standing Seam Roof 12 1 1/2x5 1/2 Steel Tube 3"x3" Tube Steei Frame Coppe�eld HS Pro Cap Air-Cooled , _ . , T:• ' ' � . i ' . . , � _ . ' . . ' ' � � V - � ' � �� fi�'O . l NTL.�l� S �.}/ �'lN� �/ �OUl� Gs��GG:-� ��lo uS�. �� C �� {�-.. ; - . iy �:�4c�- . 4"� ��u�� ` '� r-`v� �4-� �= GQ�t � � J �- . � ; ':�p� � ��'ct�� +v�,�c'�"�� _ ��t20vv� - G�UP�.SX'c.;�::�,.fb`�i h►i►� �.# ;- _ �Z �� t�i r�:�. �! -- �-� '' � C'► �� I,.; — �`� �' � . ` ; - .. � rM �,.� ¢p�N � ,� � _ . A!e��l r.u� � �� _ - . �►�� t�� r�ur�s = 1��2�1� =�. � �� ; . �O�D Ge6d s1�UG�C'1D'tal {�.,.�" . ��1�+�-Y�. _ ��.� �� - , � # � j��µ- � . ��1� p� ; : - ::;::�Z�'?� . ��l�l(�1`t�! — l27" � _,...: � �� ,' ; � I �.{�.,�;� �ND � �� =��5� ��C� �zZ.-�s . , - t3d2 � »= . �� o . ; . �� % �- . - '; i^. � � � . � . . . , � . _ � . . . .. � . � . . . . . . . . . �� -� (,� . � ��, 9 �,� F��,� �w�u�-s �P.�rK u�4�, i�'�� ou� � C vtin� r� }+� : = zz" y�t� i�l V� � z�{ " _ Zyy M i r� +� : - �e1�a14 1cLv'� � � �q �• � N� �c�,� ��' w►iu op�-' � w„ � r�c� oP'E� f� �.�4 - �3Z �. � �� %oe . �ko pr�.�t� C;oas��na� . -�i Etb�+T = ZZ� � S y v� ►b� _ �iZ" . � . �Eµ��.:E _ ?3 � - " : � : �- .1. � Zz.�s� .�� ,s � z,� �Wz . �, .; � _ _ ��OZ 54. � t� • � 6A�-Brt;,� � � � . ; �� Z�� - DuraTech 5' - 24' Chimney Shroud . � � � . . COMPLETE VENTING SOLUTIONS FOR THE HEARTH INDUSTRY A MAJOR CAUSE OF CHIMNEY RELATED FIRES IS FAILURE TO MAINTAIN REQUIRED CLEARANCES (AIR SPACES) TO COMBUSTIBLE MATERIALS. IT IS OF THE UTMOST IMPORTANCE THAT THIS CHIMNEY BE INSTALLED ONLY IN ACCORDANCE WITH THESE INSTRUCTIONS. NOTE: Read through all �eae inatructions before beginning your installa�on. Failure toinstall the chimney aa deacribed in theae instructiona will void the manufacturer'a warranty and may have an effect on your homeowner insurance and UL Iisting statua. Refer to the DuraTech Chimney Inatailatlon Inatructiona for complete details on Installing the DuraTech Chimney system. Keep these instructlons for future use. Dear Cu�tomer, Installer, or End User, I welcome any comments regarding matters pertaining to our Simpson Dura-Vent products. I weicome any ideas, input or complaints and I'il make sure that someone responds directly back to you. Send your emails to: president@duravent.com If you are searching.for tech support or product information, please phone us at 800-835-4429. Or email us at: techsupport@duravent.com Sincererly, Steve Eberhard, President and CEO Simpson Dura-Vent Co., Inc. APPLICATION AND LISTING As specified in these instructions, Shrouds are approved for use with DuraTech Chimney (5"-24" diameter). A Shroud built and installed in compliance with these instructions is UL listed for use with DuraTech chimney (listing number MH7399). INSTALLATION NOTES Practice good workmanship. Exercise extreme caution when working on roofs, Be sure to wear appropriate safety gear and clothing as needed. Refer to the DuraTech Chimney Installation Instructions for further safety details. MH7399 �L SHROUD REQUIREMENTS Shrouds can either be field-fabricated or factory-fabrfcated, but they must meet the requirements as specified in these instructions. Shrouds must be constructed of a minimum 24 gauge (.024") stainless steel, aluminized steel, galvanized steel, or copper, Other materials may also be used, such as brick, mortar, stucco, stone, etc., provided they are compietely non-combustible. Check with your local building code authorities for any additional shroud requirements. Shrouds must be able to be remaved to allow chimney access to properly clean the chimney. DuraTech installations which include the use of a shroud must comply with the following requirements (Fl�ure 1): • DuraTech chimney must maintain at least 2" clearance from combustible materials. • The chase enclosure must be ventilated. • The Chase Top Flashing or fleld-fabricated chase pan must be used. Fieldfabricated chase pans are acceptable if they meet these requirements: • Materiai must be 24 gauge (.024") Galvanized steel or equivalent, • Chase pan must have opening 3" larger than outside diameter of chimney pipe with at least a 1/2" upturned flangelcollar, • Chase pan must overhang chase by 1/2" per side for proper air flow, ■ Chase pan must have a 1" down urned outside edge (weather protection). ALLOW A 1-INCH AIR GAP BEfWEEN STORM COLLAR AND CHASE TOP FlASHING � 5"-16" DIAMETER � CHIMNEY MUST EXTEND AT LEAST 3- INCHES, 18"-24" MUST EXTEND AT LEAST 6- INCHE$ ABOVE CHASE TOP FLASHING 1/2" AIR SPACE ESTABLISHED BYSPACERS CHIMNEY CAP STORM COLLAR a �CHASE TOP FLASHING OR CHASE PAN d � DURATECH CHIMNEY �--� � 1/2-INCH�\ , , f �� 1 MAINTAIN 2-INCH � CLEARANCE BEfWEEN i i DURATECH CHIMNEY AND FIELD-FABRICATED CHASEENCLOSURE � SPACERSFORCHASE � `. TOP FLASHING ,' � ,� Figure 1 • Field-fabricated spacers (1/2" tall, 24 gauge or .024" Galvanized steel) must be used to suppo�t the Chase Top Flashing or chase pan, in order to provide air flow. • 5"-16u DuraTech chimney must extend at least 3" above the chase pan/flashing, • 18"-24" DuraTech chimney must extend at least 6" above chase panlflashing. • A DuraTech chimney cap must be used inside the shroud. • The Shroud must not be in direct contact with any of the DuraTech components (other than Chase Top Flashing), • All Open Areas of the shroud must be covered with 112" stainless or galvanized steel mesh screen to prevent debris from entering the Shroud. • Shrouds must follow the dimensional requirements specified in Tables 1, 2 or 3, depending on the style of shroud used, The three basic shroud styles are a) House, b) Arch or Mailbox, and c) Pyramid. Most factory-fabricated shrouds will fail under one of these basic sryle categories. WARRANTY Simpson Dura-Vent makes no warranty or representation of any kind, either express or implied, conceming the materials, quality, workmanship or installation of the third-party manufactured shrouds that may be used in connection with the DuraTech Chimney System. Simpson expressly disclaims any and ail ifability of any kind related to the materials, quality, workmanship or installation of such third party manufactured shrouds, Simpson warrants the accuracy of its specifications for the selection of third-party manufactured shrouds, Should a third-party manufactured shroud require replacement due to the inaccuracy of a Simpson selection specification, Simpson's sole obligation and liability will be to replace such shroud with one of similar size and quality appropriate to the installation, Simpson's warranties are otherwise limited to the warranties set forth in the DuraTech Lifetime Limited Warranty, HOUSE STYLE SHROUD Shaded area represents saeened openArea. Actual shape The House style shroud is roughly square or of Shroud may vary as long as minimum dimensions and minimum Open Area requirements are met, rectangular with a closed top and exhaust openings on four (4) sides. (Figure 2) Table 1 lists the minimum Shroud dimensions, the minimum Open Area per side, ,� �- _,� and the minimum Totai Open Area -�' �� for the Shroud, depending on the diameter of �� ; ��`;.� �� OuraTech chimney used. �--,._T � �'� � H � � Y � Figure 2 � H; Minimum height of Shroud L: Mlnlmum length of Shroud W; Mlnimum width of Shroud Table 1: House Style Shroud Mlnimum Dimenslons ARCH 1 MAILBOX ST1(LE SHROU D Shaded area represents saeened Open Area. Actual shape The Arch or Mailbox s le shroud enerali has of Shroud may vary as long as minimum dmensions and tY 9 Y minlmum Ooen Area reaulrements are met two solid sides and a solid top. The exhaust openings are on the two (2) open ends of the arch. (Flgure 3) Table 2 lists the minimum Shroud dimensions, the minimum Open Area per side, and the minimum Total Open Area for the Shroud, depending on the diameter of DuraTech chi � Figure 3 H; Minimum height of Shroud L: Minimum length of Shroud W; Minimum width of Shroud Table 2: Arch/Mallbox Style Shroud Mlnlmum Dimensions PYRAMID STYLE SHROUD Shaded area represents saeened Open Area. Actual ahape The Pyramid style shroud is roughly square af Shroud may vary as long as minimum dimensions and minlmum Open Area requirements are met or rectangular with an open top for exhaust as well as openings along the base of the four (4) sides. (Flgure � Table 3 lists the minimum Shroud dimensions, including the minimum height and length of the base openings on the sides, depending on the diameter of DuraTech chimney. nyui@ 4 L: Mlnlmum length of Shroud top opening W; Minimum width of Shroud top opening H1: Mlnimum total height of Shroud B: Minimum length of opening along base H2; Minimum height of opening along base Table 3: Pyramld Style Shroud Minlmum Dimensions Sir�On Dura-Vent ��c PO Box 1510 VacaviAe CA 956961510 Simpson Dura-Vent 50 years of Engi� Exceller� Manufactured in VacaviNe CA and Vidcsbu�g MS SIMPSON Customer Service Support 800-835-4429 707-446-4740 FAX wwwwKduravent.com canvent, DirecNent Poo, a,raelack, a,raa,4nney ��, a,racamed, a,raFle�c, ouiali�er DuraTecn, axa�us, Dur�M�s HTC, o�verd. DVL. P�et�/e�, and Pe�lent Pro are regi�ed i�aae�r�fcs af aie S�mpson Du�vEnt co., tric. AY rigMs re.s�ved, 2om. Maae in nie usa Simpson Ux�Vent is a dn'sion � Srnpsai Manufa�ring Cortpeny. NYSE:SSO. L157 102007