HomeMy WebLinkAboutSpecification Section - 04431313 - ANCHORED STONE MASONRY VENEER.pdfTHE EDUCATION CENTER Project No. 122175.00
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ANCHORED STONE MASONRY VENEER 044313.13 - 1
SECTION 044313.13 - ANCHORED STONE MASONRY VENEER
PART 1 - GENERAL
1.1 SUMMARY
A. Section Includes:
1. Stone masonry anchored to concrete backup.
2. Stone masonry anchored to wood framing and sheathing.
1.2 ACTION SUBMITTALS
A. Product Data: For each variety of stone, stone accessory, and manufactured product.
B. Samples:
1. For each stone type indicated.
C. Mockups:
1. Construct mockup panel on site for Architect’s evaluation and approval prior to installing
stone veneer. Mockup panel shall be 4 feet by 4 feet minimum in size.
1.3 FIELD CONDITIONS
A. Protection of Stone Masonry: During construction, cover tops of walls, projections, and sills
with waterproof sheeting at end of each day's work.
B. Cold-Weather Requirements: Do not use frozen materials or materials mixed or coated with ice
or frost. Do not build on frozen substrates. Comply with cold-weather construction
requirements contained in ACI 530.1/ASCE 6/TMS 602.
1. Cold-Weather Cleaning: Use liquid cleaning methods only when air temperature is 40
deg F (4 deg C) and above and will remain so until masonry has dried.
C. Hot-Weather Requirements: Comply with hot-weather construction requirements contained in
ACI 530.1/ASCE 6/TMS 602.
PART 2 - PRODUCTS
2.1 QUARTZ-BASED STONE
A. Quartz-Based Stone: Comply with ASTM C 616, Classification II Quartzitic Sandstone or
III Quartzite.
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1. Products: Subject to compliance with requirements, provide the following:
2. Building Stone Veneer: 4-inch thick (nominal) stone veneer by Telluride Stone
Company, “Aspen Blend.”
3. Stone Caps: 2- or 4-inch (nominal) thick stone caps by Telluride Stone Company,
“Aspen Blend.” Provide cap thickness as indicated on Drawings.
2.2 MORTAR MATERIALS
A. Portland Cement: ASTM C 150, Type I or Type II, except Type III may be used for cold-
weather construction; natural color or white cement may be used as required to produce mortar
color indicated.
1. Low-Alkali Cement: Not more than 0.60 percent total alkali when tested according to
ASTM C 114.
B. Hydrated Lime: ASTM C 207, Type S.
C. Masonry Cement: ASTM C 91.
1. Products: Subject to compliance with requirements, available products that may be
incorporated into the Work include, but are not limited to, the following:
a. Cemex S.A.B. de C.V.; Citadel Type S or Dixie Type S.
b. Lafarge North America Inc.; Magnolia Masonry Cement or Lafarge Masonry
Cement.
c. Lehigh Cement Company; Lehigh Masonry Cement.
d. National Cement Company, Inc.; Coosa Masonry Cement.
D. Aggregate: ASTM C 144 and as follows:
1. For pointing mortar, use aggregate graded with 100 percent passing Black sieve.
2. White Aggregates: Natural white sand or ground white stone.
3. Colored Aggregates: Natural-colored sand or ground marble, granite, or other sound
stone; of color necessary to produce required mortar color.
E. Water: Potable.
2.3 VENEER ANCHORS
A. Materials:
1. Hot-Dip Galvanized, Carbon-Steel Wire: ASTM A 82/A 82M; with
ASTM A 153/A 153M, Class B-2.
2. Hot-Dip Galvanized-Steel Sheet: ASTM A 1008/A 1008M, cold-rolled, carbon-steel
sheet, hot-dip galvanized after fabrication to comply with ASTM A 153/A 153M,
Class B-2.
B. Corrugated-Metal Veneer Anchors: Not less than 0.030-inch- (0.76-mm-) thick by 7/8-inch-
(22-mm-) wide hot-dip galvanized-steel sheet with corrugations having a wavelength of 0.3 to
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ANCHORED STONE MASONRY VENEER 044313.13 - 3
0.5 inch (7.6 to 13 mm) and an amplitude of 0.06 to 0.10 inch (1.5 to 2.5 mm). For use with
stone veneer with concrete wall backing.
C. Adjustable, Screw-Attached Veneer Anchors: Units consisting of a wire tie section and a metal
anchor section that allow vertical adjustment but resist tension and compression forces
perpendicular to plane of wall, for attachment over sheathing to wood studs, and as follows:
1. Products: Subject to compliance with requirements, provide one of the following:
a. Dayton Superior Corporation, Dur-O-Wal Division; D/A 213 or D/A 210 with
D/A 700-708.
b. Heckmann Building Products Inc.; 315-D with 316 or Pos-I-Tie.
2. Structural Performance Characteristics: Capable of withstanding a 100-lbf (445-N) load
in both tension and compression without deforming or developing play in excess of 0.05
inch (1.3 mm).
3. Fabricate sheet metal anchor sections and other sheet metal parts from 0.067-inch- (1.7-
mm-) thick, steel sheet, galvanized after fabrication.
4. Wire Ties: Triangular-, rectangular-, or T-shaped wire ties fabricated from 0.188-inch-
(4.8-mm-) hot-dip galvanized steel wire.
2.4 EMBEDDED FLASHING MATERIALS
A. Metal Flashing: Provide metal flashing, where flashing is exposed or partly exposed and where
indicated, complying with Section 076200 "Sheet Metal Flashing and Trim" and as follows:
1. Stainless Steel: ASTM A 240/A 240M, Type 304, 0.016 inch (0.4 mm) thick.
2.5 MISCELLANEOUS MASONRY ACCESSORIES
A. Asphalt Dampproofing: Cut-back asphalt complying with ASTM D 4479, Type I or asphalt
emulsion complying with ASTM D 1227, Type III or Type IV.
B. Weep/Vent Products: Use one of the following unless otherwise indicated:
1. Wicking Material: Absorbent rope, made from cotton or UV-resistant synthetic fiber, 1/4
to 3/8 inch (6 to 10 mm) in diameter, in length required to produce 2-inch (50-mm)
exposure on exterior and 18 inches (450 mm) in cavity behind stone masonry. Use only
for weeps.
2. Round Plastic Tubing: Medium-density polyethylene, 3/8-inch (10-mm) OD by
thickness of stone masonry.
C. Cavity Drainage Material: Free-draining mesh, made from polymer strands that will not
degrade within the wall cavity.
1. Products: Subject to compliance with requirements, available products that may be
incorporated into the Work include, but are not limited to, the following:
a. Advanced Building Products Inc.; Mortar Break or Mortar Break II.
b. CavClear/Archovations, Inc.; CavClear Masonry Mat.
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c. Dayton Superior Corporation, Dur-O-Wal Division; Polytite MortarStop.
d. Mortar Net USA, Ltd.; Mortar Net.
2. Provide one of the following configurations:
a. Sheets or strips not less than 3/4 inch (19 mm) thick and installed to full height of
cavity with additional strips 4 inches (100 mm) high at weep holes and thick
enough to fill entire depth of cavity and prevent weep holes from being clogged
with mortar.
2.6 MASONRY CLEANERS
A. Proprietary Acidic Cleaner: Manufacturer's standard-strength cleaner designed for removing
mortar and grout stains, efflorescence, and other new construction stains from stone masonry
surfaces without discoloring or damaging masonry surfaces; expressly approved for intended
use by cleaner manufacturer and stone producer.
1. Manufacturers: Subject to compliance with requirements, available manufacturers
offering products that may be incorporated into the Work include, but are not limited to,
the following:
a. Diedrich Technologies, Inc.
b. Dominion Restoration Products.
c. EaCo Chem, Inc.
d. Hydrochemical Techniques, Inc.
e. Prosoco, Inc.
2.7 FABRICATION
A. Cut, Split, or Select stone to produce pieces of thickness, size, and shape indicated, including
details on Drawings.
B. Thickness of Stone: Provide thickness indicated, but not less than the following:
1. Stone Veneer Thickness: 4 inches (100 mm) plus or minus 1/2 inch (13 mm). Thickness
does not include projection of pitched faces.
2. Stone Cap Thickness: 2- or 4-inches (50 - 100 mm) plus or minus 1/4 inch (6 mm).
Provide stone cap thicknesses as indicated on the Drawings.
C. Shape stone for type of masonry (pattern) as follows:
1. Coursed ledge stone with “drystack” appearance.
D. Finish exposed stone faces and edges to comply with requirements indicated for finish and to
match approved samples.
1. Finish for Stone Veneer: Natural cleft.
2. Finish for Stone Caps: Natural cleft.
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2.8 MORTAR MIXES
A. General: Do not use admixtures unless otherwise indicated.
1. Do not use calcium chloride.
2. Use portland cement-lime mortar unless otherwise indicated.
3. Mixing Pointing Mortar: Thoroughly mix cementitious and aggregate materials together
before adding water. Then mix again, adding only enough water to produce a damp,
unworkable mix that will retain its form when pressed into a ball. Maintain mortar in this
dampened condition for one to two hours. Add remaining water in small portions until
mortar reaches required consistency. Use mortar within 30 minutes of final mixing; do
not retemper or use partially hardened material.
B. Mortar for Stone Masonry: Comply with ASTM C 270, Proportion Specification.
1. Mortar for Setting Stone: Type S.
2. Mortar for Pointing Stone: Type N.
PART 3 - EXECUTION
3.1 PREPARATION
A. Accurately mark stud centerlines on face of weather-resistant sheathing paper before beginning
stone installation.
B. Coat concrete and unit masonry backup with asphalt dampproofing.
3.2 SETTING OF STONE MASONRY, GENERAL
A. Perform necessary field cutting and trimming as stone is set.
1. Use hammer and chisel to split stone that is fabricated with split surfaces.
2. Pitch face at field-split edges as needed to match stones that are not field split.
B. Sort stone before it is placed in wall to remove stone that does not comply with requirements
relating to aesthetic effects, physical properties, or fabrication, or that is otherwise unsuitable
for intended use.
C. Arrange stones with color variations uniformly dispersed for an evenly blended appearance. As
stone veneer is stacked, larger stones (face dimensions) shall generally be placed near bottoms
of walls, and smaller stones placed near tops of walls. Work that exhibits poorly-mixed stone
sizes will be rejected.
D. Maintain uniform joint widths except for variations due to different stone sizes and where minor
variations are required to maintain bond alignment if any.
E. Arrange stones in ledgestone pattern with joint widths within tolerances indicated. Insert small
stones into spaces between larger stones as needed to produce joints as uniform in width as
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practical. Work stones as required to achieved desired appearance and avoid excessive use of
“cheater” stones to fill small gaps.
F. Provide sealant joints of widths and at locations indicated.
1. Keep sealant joints free of mortar and other rigid materials.
2. Sealing joints is specified in Section 079200 "Joint Sealants."
G. Install embedded flashing and weep holes at shelf angles, lintels, ledges, other obstructions to
downward flow of water in wall, and where indicated.
1. At stud-framed walls, extend flashing through stone masonry, up sheathing face at least
12 inches (300 mm), and behind weather barrier.
2. At concrete backing, extend flashing through stone masonry, turned up a minimum of 6
inches (150 mm), and insert in reglet.
3. At concrete unit masonry backing
4. At lintels and shelf angles, extend flashing full length of angles but not less than 6 inches
(150 mm) into masonry at each end.
5. At sills, extend flashing not less than 4 inches (100 mm) at ends.
6. At ends of head and sill flashing, turn up not less than 2 inches (50 mm) to form end
dams.
7. Extend sheet metal flashing 1/2 inch (13 mm) beyond masonry face at exterior, and turn
flashing down to form a drip.
8. Install metal drip edges beneath flexible flashing at exterior wall face. Stop flexible
flashing 1/2 inch (13 mm) back from exterior wall face and adhere flexible flashing to top
of metal drip edge.
9. Install metal flashing termination beneath flexible flashing at exterior wall face. Stop
flexible flashing 1/2 inch (13 mm) back from exterior wall face and adhere flexible
flashing to top of metal flashing termination.
10. Cut flexible flashing flush with wall face after completing masonry wall construction.
H. Place weep holes and vents in joints where moisture may accumulate, including at base of
cavity walls, above shelf angles, and at flashing.
1. Use wicking material or round plastic tubing to form weep holes at bottoms of stone
veneer walls.
2. Space weep holes 24 inches (600 mm) o.c.
3. Trim wicking material used in weep holes flush with exterior wall face after mortar has
set.
3.3 INSTALLATION OF ANCHORED STONE MASONRY
A. Anchor stone masonry to concrete with corrugated-metal veneer anchors unless otherwise
indicated. Secure anchors by using power actuated fasteners to concrete.
B. Anchor stone masonry to stud framing with adjustable, screw-attached veneer anchors unless
otherwise indicated. Fasten anchors through sheathing to framing with two screws.
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C. Embed veneer anchors in mortar joints of stone masonry at least halfway, but not less than 1-1/2
inches (38 mm), through stone masonry and with at least a 5/8-inch (16-mm) cover on exterior
face.
D. Set stone in full bed of mortar with full head joints unless otherwise indicated. Build anchors
into mortar joints as stone is set.
E. Fill collar joint (space between back of stone masonry and weather-resistant sheathing paper)
with mortar as stone is set.
F. Provide 1-inch (25-mm) cavity between stone masonry and wood stud backup construction.
Keep cavity free of mortar droppings and debris.
G. Unless “drystack” joints are indicated, rake out joints for pointing with mortar to depth of not
less than 1/2 inch (13 mm) before setting mortar has hardened.
3.4 POINTING
A. Prepare stone-joint surfaces for pointing with mortar by removing dust and mortar particles.
Where setting mortar was removed to depths greater than surrounding areas, apply pointing
mortar in layers not more than 3/8 inch (10 mm) deep until a uniform depth is formed.
B. Point stone joints by placing and compacting pointing mortar in layers of not more than 3/8 inch
(10 mm) deep. Compact each layer thoroughly and allow to it become thumbprint hard before
applying next layer.
C. Tool joints, when pointing mortar is thumbprint hard, with a smooth jointing tool to produce the
following joint profile:
1. Joint Profile: “Drystack” joints.
3.5 ADJUSTING AND CLEANING
A. In-Progress Cleaning: Clean stone masonry as work progresses. Remove mortar fins and
smears before tooling joints.
B. Final Cleaning: After mortar is thoroughly set and cured, clean stone masonry as follows:
1. Remove large mortar particles by hand with wooden paddles and nonmetallic scrape hoes
or chisels.
2. Test cleaning methods on mockup; leave one-half of panel uncleaned for comparison
purposes. Obtain Architect's approval of sample cleaning before cleaning stone masonry.
3. Protect adjacent stone and nonmasonry surfaces from contact with cleaner by covering
them with liquid strippable masking agent, polyethylene film, or waterproof masking
tape.
4. Wet wall surfaces with water before applying cleaner; remove cleaner promptly by
rinsing thoroughly with clear water.
5. Clean stone masonry with proprietary acidic cleaner applied according to manufacturer's
written instructions.
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END OF SECTION 044313.13