SECTION 04 21 00

CLAY MASONRY UNITS

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PART 1    GENERAL
1.1	SECTION INCLUDES
A.	Facing Brick: 
1.	Residential Series
2.	Architectural (Commercial) Series 
B.	Thin Veneer Brick
C.	Mortar and Grout materials.
D.	Ties and anchors.
E.	Embedded flashing.
F.	Accessories.
G.	Mortar mixes
1.2	RELATED SECTIONS
A.	Division 07 specification sections for waterproofing on substrates behind clay masonry unit walls
B.	Section 07 21 00 - Thermal Insulation for insulation installed behind clay masonry unit walls
C.	Section 07 92 00 - Joint Sealants for sealant used in joints in clay masonry unit 
1.3	REFERENCES
A.	ASTM International (ASTM)
1.	ASTM C 216 - Standard Specification for Facing Brick (Solid Masonry Units Made from Clay or Shale).
2.	ASTM C 1088 - Standard Specification for Thin Veneer Brick Units Made from Clay or 
1.4	SUBMITTALS
A.	Submit under provisions of Section 01 30 00.
B.	Product Data:
1.	Manufacturer's data sheets on each product to be used.
2.	Preparation instructions and recommendations.
3.	Storage and handling requirements and recommendations.
4.	Typical installation methods.
C.	Verification Samples: Two representative units of each type, size, pattern, and color.
D.	Shop Drawings: Include details of materials, construction, and finish. Include relationship with adjacent construction. 
1.5	QUALITY ASSURANCE
A.	Manufacturer Qualifications: Company specializing in manufacturing products specified in this section with a minimum of five years documented experience.
B.	Installer Qualifications: Company specializing in performing Work of this section with minimum two years documented experience with projects of similar scope and complexity.
C.	Source Limitations: Provide each type of product from a single manufacturing source to ensure uniformity.
D.	Mock-Up: Construct a mock-up with actual materials in sufficient time for Architect's review and to not delay construction progress. Locate mock-up as acceptable to Architect and provide temporary foundations and support.
1.	The intent of a mock-up is to demonstrate quality of workmanship and visual appearance.
2.	If the mock-up is not acceptable, rebuild the mock-up until satisfactory results are achieved.
3.	Retain mock-up during construction as a standard for comparison with completed work. 
4.	Do not alter or remove mock-up until work is completed or removal is authorized.
1.6	PRE-INSTALLATION CONFERENCE
A.	Convene a conference approximately two weeks before scheduled commencement of the Work. Attendees shall include Architect, Contractor and trades involved. Agenda shall include schedule, responsibilities, critical path items and approvals.
1.7	DELIVERY, STORAGE, AND HANDLING
A.	Store and handle in strict compliance with manufacturer's written instructions and recommendations.
B.	Protect from damage due to weather, excessive temperature, and construction operations.
1.8	PROJECT CONDITIONS
A.	Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacturer's recommended limits.
1.9	WARRANTY
A.	Manufacturer's standard limited warranty unless indicated otherwise.
PART 2    PRODUCTS
2.1	MANUFACTURERS
A.	Acceptable Manufacturer: Palmetto Brick Company, which is located at:<BR />3501 Brickyard Rd.<BR />Wallace, SC 29596<BR />Toll Free Tel: 800-922-4423<BR />Tel: 843-537-7861<BR />Email: request info (jsanderson@palmettobrick.com);Web: https://www.palmettobrick.com 
B.	Substitutions: Not permitted.
C.	Requests for substitutions will be considered in accordance with the provisions of Section 01 60 00.
2.2	PERFORMANCE REQUIREMENTS
A.	Standards Compliance: 
1.	Test bricks in accordance with ASTM C67.
2.	Mortar shall comply with ASTM C270
B.	Facing Brick: ASTM C 216, Grade SW,
1.	Type FBS
2.	Type FBX. (By Request)
3.	Type FBA.
C.	Thin Veneer Brick: ASTM C 1088
1.	Grade Exterior.
2.	Grade Interior.
3.	Type TBS.
4.	Type TBA
2.3	PRODUCT TYPES
A.	Basis of Design (thin brick and full size brick available in all series):
1.	Residential Series:
a.	Ship Ballast
b.	Terra Blend
c.	Old Lynchburg
d.	Laurel Bay
e.	Old English
f.	London Ballast
g.	Old Marlboro
h.	Biltmore
i.	Kingsmill 
j.	Hampton
k.	Ashland
l.	Savannah River
m.	Low Country 
n.	Bucksport
o.	Myrtle Sand
p.	Riviera
q.	Onslow
r.	Hartsville Rose
s.	Woodstock (Queensize & Oversize ONLY)
t.	Oak Grove (Queensize & Oversize ONLY)
2.	Architctural /Commercial Series (standard production sizes are modular and utility) 
a.	Red Wirecut 
b.	Med Red Wirecut 
c.	Dark Red Wirecut 
d.	Flashed Red Wirecut 
e.	Caramel 
f.	Mocha
g.	Walnut 
h.	Chocolate Wirecut 
i.	Brown Wirecut 
j.	Buffstone Wirecut 
k.	.25 Greystone Wirecut 
l.	.75 Greystone Wirecut
m.	1.25 Greystone Wirecut
n.	2.0 Greystone Wirecut 
o.	Light Rose Wirecut 
p.	Dark Rose Wirecut 
q.	Ivorystone
r.	Whitestone 
s.	Pewter Grey 
t.	Platinum Grey 
u.	Blackstone Wirecut 
B.	Dimensions
1.	Thin Brick:
a.	Modular Thin Flat: 5/8 inches x 2-1/4 inches x 7-5/8 inches
b.	Modular Thin Corner: 5/8 inches x 2-1/4 inches x 7-5/8 inches with 3-5/8 inches return
c.	Quenensize Thin Flat: 5/8 inches x 2-3/4 inches x 7-5/8 inches
d.	Quenensize Thin Corner: 5/8 inches x 2-3/4 inches x 7-5/8 inches with 2-3/4 inches return
e.	Oversize Thin Flat: 5/8 inches x 2-3/4 inches x 7-5/8 inches
f.	Oversize Thin Corner: 5/8 inches x 2-3/4 inches x 7-5/8 inches with 3-5/8 inches return
g.	Utility Thin Flat: 3/4 inches x 3-5/8 inches x 11-5/8 inches
2.	Regular Brick:
a.	Modular: 2-1/4 inches x 3-5/8 inches x 7-5/8 inches
b.	Queensize: 2-3/4 inches x 2-3/4 inches x 7-5/8 inches
c.	Oversize: 2-3/4 inches x 3-5/8 inches x 7-5/8 inches 
d.	Closure: 3-5/8 inches x 3-5/8 inches x 7-5/8 inches
e.	Utility: 3-5/8 inches x 3-5/8 inches x 11-5/8 inches
C.	Textures and Colors:
1.	For textures in the commercial series other than wirecut, please contact your Palmetto Brick sales person or distributor.
2.	Thin bricks are available in all the colors available in the Residential and Architectural Series in the aforementioned sizes.
2.4	MORTAR AND GROUT MATERIALS
A.	LEED Requirements:
1.	Regional Materials - Aggregate for mortar and grout, cement, and lime shall be manufactured within 500 miles of Project site from aggregates and cement that have been extracted, harvested, or recovered, as well as manufactured, within 500 miles of Project site.
B.	Masonry Cement: ASTM C 91, Type S load bearing and below ground masonry. Type N for all other masonry including masonry veneer and cast stone masonry.
1.	Mortar color shall be standard gray for CMU (unless otherwise indicated), and shall match for the duration of the project.
C.	Portland Cement: ASTM C 150, Type I; color as required to produce approved color sample.
1.	Hydrated Lime: ASTM C 207, Type S.
2.	Mortar Aggregate: ASTM C 144.
3.	Grout Aggregate: ASTM C 404.
D.	Sand: White, washed masonry sand. UNWASHED SAND WILL NOT BE ALLOWED AND WILL BE CAUSE FOR REJECTION OF WORK. Unless otherwise approved by architect.
E.	Water: Clean and potable.
F.	Moisture-Resistant Admixture: Water repellent compound designed to reduce capillarity action.
2.5	TIES AND ANCHORS
A.	General: Ties and anchors extend at least 1-1/2 inches into veneer but with at least a 5/8-inch cover on outside face.
B.	Materials: Provide ties and anchors specified in this article that are made from materials that comply with the following unless otherwise indicated:
1.	Hot-Dip Galvanized, Carbon-Steel Wire: ASTM A1064/A1064M, with ASTM A153/A153M, Class B-2 coating.
2.	Steel Sheet, Galvanized after Fabrication: ASTM A1008/A1008M, Commercial Steel, with ASTM A153/A153M, Class B coating.
C.	Adjustable Masonry-Veneer Anchors:
1.	General: Provide anchors that allow vertical adjustment but resist a 100 lbf load in both tension and compression perpendicular to plane of wall without deforming or developing play in excess of 1/16 inch.
2.	Fabricate sheet metal anchor sections and other sheet metal parts from 0.1084-inch- thick steel sheet, galvanized after fabrication .
3.	Fabricate wire ties from 0.25-inch- diameter, hot-dip galvanized steel wire unless otherwise indicated.
4.	Masonry-Veneer Anchors; Seismic-Pintle Plate: Rib-stiffened, sheet metal anchor section with screw holes at top and bottom, projecting leg with slotted hole for vertical leg of seismic pintle tie. Tie is rib-stiffened, sheet metal bent plate with down-turned leg to fit in anchor slot and with integral tabs to hold continuous wire in veneer.
a.	Manufacturers: Subject to compliance with requirements, provide products by one of the following:
1)	Hohmann & Barnard, Inc.
2)	Wire-Bond.
3)	Or approved equal.
2.6	EMBEDDED FLASHING
A.	Metal Flashing: Provide metal flashing complying with SMACNA's Architectural Sheet Metal Manual and as follows:
1.	Stainless Steel: ASTM A240/A240M or ASTM A666, Type 304, 0.016 inch thick.
2.	Fabricate continuous flashings in sections 96 inches long minimum, but not exceeding 12 ft.. Provide splice plates at joints of formed, smooth metal flashing.
a.	Manufacturers: Subject to compliance with requirements, provide products by one of the following:
1)	Cheney Flashing Company.
2)	Hohmann & Barnard, Inc.
3)	Keystone Flashing Company, Inc.
4)	Or approved equal.
3.	Fabricate through-wall flashing with snaplock receiver on exterior face where indicated to receive counterflashing.
4.	Fabricate metal drip edges from stainless steel. Extend at least 3 inches into wall and 1/2 inch out from wall, with outer edge bent down 30 degrees and hemmed.
B.	Flexible Flashing: Use the following unless otherwise indicated:
1.	Rubberized-Asphalt Flashing: Composite flashing product consisting of a pliable, adhesive rubberized-asphalt compound, bonded to a high-density, cross-laminated polyethylene film to produce an overall thickness of not less than 40 mil.
a.	Manufacturers: Subject to compliance with requirements, provide products by one of the following:
1)	Carlisle Coatings & Waterproofing Inc.
2)	Heckmann Building Products, Inc.
3)	Hohmann & Barnard, Inc.
4)	W.R. Meadows, Inc.
5)	Or approved equal.
b.	Accessories: Provide preformed corners, end dams, other special shapes, and seaming materials produced by flashing manufacturer.
C.	Adhesives, Primers, and Seam Tapes for Flashings: Flashing manufacturer's standard products or products recommended by flashing manufacturer for bonding flashing sheets to each other and to substrates.
D.	Termination Bars for Flexible Flashing: Stainless steel steel bars 1/8 inch by 1 inch.
2.7	ACCESSORIES
A.	Weep/Vent Products: Use the following unless otherwise indicated:
1.	Cellular Plastic Weep/Vent: One-piece, flexible extrusion made from UV-resistant polypropylene copolymer, full height and width of head joint and depth 1/8 inch less than depth of outer wythe, in color selected from manufacturer's standard.
a.	Manufacturers: Subject to compliance with requirements, provide products by one of the following:
1)	Advanced Building Products Inc.
2)	Hohmann & Barnard, Inc.
3)	Mortar Net Solutions.
4)	Wire-Bond.
5)	Or approved equal.
B.	Cavity Drainage Material: Free-draining mesh, made from polymer strands that will not degrade within the wall cavity.
1.	Mortar Deflector: Strips, full depth of cavity and 10 inches high, with dovetail-shaped notches that prevent clogging with mortar droppings.
a.	Manufacturers: Subject to compliance with requirements, provide products by one of the following:
1)	Advanced Building Products Inc.
2)	Hohmann & Barnard, Inc.
3)	Mortar Net Solutions.
4)	Wire-Bond.
5)	Or approved equal.
2.8	MORTAR AND GROUT MIXES
A.	Mortar for Unit Masonry: ASTM C 270, using the Proportion Specification.
1.	Masonry below grade and in contact with earth: Type S.
2.	Exterior, loadbearing masonry: Type S.
3.	Exterior, non-loadbearing masonry: Type N.
4.	Interior, loadbearing masonry: Type N.
5.	Interior, non-loadbearing masonry: Type N.
B.	Colored Mortar: Proportion selected pigments and other ingredients to match Architect's sample, without exceeding manufacturer's recommended pigment-to-cement ratio. Submit samples to Architect for selection.
1.	Brick Mortar Color - Color as selected by Architect.
C.	Mortar shall be selected from the following mortar manufacturers:
1.	Holcim (US) Inc.
2.	LaFarge North America Inc.
3.	Or approved equal.
D.	Grout: ASTM C 476. Consistency required to fill complete volumes indicated for grouting; fine grout for spaces with smallest horizontal dimension of 2 inches or less; coarse grout for spaces with smallest horizontal dimension greater than 2 inches.
E.	Mixing: Use mechanical batch mixer and comply with referenced standards.
PART 3    EXECUTION
3.1	EXAMINATION
A.	Examine conditions, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of the Work.
B.	Proceed with installation only after unsatisfactory conditions have been corrected.
3.2	INSTALLATION, GENERAL
A.	Leave openings for equipment to be installed before completing masonry. After installing equipment, complete masonry to match construction immediately adjacent to opening.
B.	Use full-size units without cutting if possible. If cutting is required to provide a continuous pattern or to fit adjoining construction, cut units with motor-driven saws; provide clean, sharp, unchipped edges. Allow units to dry before laying unless wetting of units is specified. Install cut units with cut surfaces and, where possible, cut edges concealed.
C.	Select and arrange units for exposed unit masonry to produce a uniform blend of colors and textures. Mix units from several pallets or cubes as they are placed.
D.	Matching Existing Masonry: Match coursing, bonding, color, and texture of existing masonry.
E.	Wetting of Brick: Wet brick before laying if initial rate of absorption exceeds 30 g/30 sq. in. per minute when tested in accordance with ASTM C67/C67M. Allow units to absorb water so they are damp but not wet at time of laying.
3.3	TOLERANCES
A.	Dimensions and Locations of Elements:
1.	For dimensions in cross section or elevation, do not vary by more than plus 1/2 inch or minus 1/4 inch.
2.	For location of elements in plan, do not vary from that indicated by more than plus or minus 1/2 inch.
3.	For location of elements in elevation, do not vary from that indicated by more than plus or minus 1/4 inch in a story height or 1/2 inch total.
4.	Lines and Levels:
a.	For conspicuous horizontal lines, such as lintels, sills, parapets, and reveals, do not vary from level by more than 1/8 inch in 10 ft., 1/4 inch in 20 ft., or 1/2-inch maximum.
b.	For vertical lines and surfaces, do not vary from plumb by more than 1/4 inch in 10 ft., 3/8 inch in 20 ft., or 1/2-inch maximum.
c.	For conspicuous vertical lines, such as external corners, door jambs, reveals, and expansion and control joints, do not vary from plumb by more than 1/8 inch in 10 ft., 1/4 inch in 20 ft., or 1/2-inch maximum.
d.	For lines and surfaces, do not vary from straight by more than 1/4 inch in 10 ft., 3/8 inch in 20 ft., or 1/2-inch maximum.
e.	For vertical alignment of exposed head joints, do not vary from plumb by more than 1/4 inch in 10 ft., or 1/2-inch maximum.
f.	For faces of adjacent exposed masonry units, do not vary from flush alignment by more than 1/16 inch except due to warpage of masonry units within tolerances specified for warpage of units.
5.	Joints:
a.	For bed joints, do not vary from thickness indicated by more than plus or minus 1/8 inch, with a maximum thickness limited to 1/2 inch.
b.	For exposed bed joints, do not vary from bed-joint thickness of adjacent courses by more than 1/8 inch.
c.	For head and collar joints, do not vary from thickness indicated by more than plus 3/8 inch or minus 1/4 inch.
d.	For exposed head joints, do not vary from thickness indicated by more than plus or minus 1/8 inch. Do not vary from adjacent bed-joint and head-joint thicknesses by more than 1/8 inch.
e.	For exposed bed joints and head joints of stacked bond, do not vary from a straight line by more than 1/16 inch from one masonry unit to the next.
3.4	LAYING MASONRY WALLS
A.	Lay out walls in advance for accurate spacing of surface bond patterns with uniform joint thicknesses and for accurate location of openings, movement-type joints, returns, and offsets. Avoid using less-than-half-size units, particularly at corners, jambs, and, where possible, at other locations.
B.	Bond Pattern for Exposed Masonry: Lay exposed masonry in bond pattern indicated on Drawings; do not use units with less-than-nominal 4-inch horizontal face dimensions at corners or jambs.
C.	Stopping and Resuming Work: Stop work by stepping back units in each course from those in course below; do not tooth. When resuming work, clean masonry surfaces that are to receive mortar, remove loose masonry units and mortar, and wet brick if required before laying fresh masonry.
D.	Built-in Work: As construction progresses, build in items specified in this and other Sections. Fill in solidly with masonry around built-in items.
E.	Fill space between steel frames and masonry solidly with mortar unless otherwise indicated.
F.	Build nonload-bearing interior partitions full height of story to underside of solid floor or roof structure above unless otherwise indicated.
1.	Install compressible filler in joint between top of partition and underside of structure above.
2.	At fire-rated partitions, treat joint between top of partition and underside of structure above to comply with Section 07 84 43 Joint Firestopping
3.5	MORTAR BEDDING AND JOINTING
A.	Lay solid masonry units with completely filled bed and head joints; butter ends with sufficient mortar to fill head joints and shove into place. Do not deeply furrow bed joints or slush head joints.
B.	Tool exposed joints slightly concave when thumbprint hard, using a jointer larger than joint thickness unless otherwise indicated.
3.6	ANCHORED MASONRY VENEERS
A.	Anchor masonry veneers to wall framing or concrete and masonry backup with masonry-veneer anchors to comply with the following requirements:
1.	Fasten screw-attached anchors through sheathing to wall framing or to concrete and masonry backup with metal fasteners of type indicated. Use two fasteners unless anchor design only uses one fastener.
2.	Embed tie sections in masonry joints.
3.	Locate anchor sections to allow maximum vertical differential movement of ties up and down.
4.	Space anchors as indicated, but not more than 18 inches o.c. vertically and horizontally. Install additional anchors within 12 inches of openings and at intervals, not exceeding 24 inches, around perimeter.
B.	Provide airspace between back of masonry veneer and face of sheathing or insulation as indicated on Drawings.
1.	Keep airspace clean of mortar droppings and other materials during construction. Bevel beds away from airspace, to minimize mortar protrusions into airspace. Do not attempt to trowel or remove mortar fins protruding into airspace.
3.7	INSTALLATION OF ADHERED THIN BRICK VENEER
A.	Thickset Method:
1.	Mechanically fasten metal lath or mesh securely to substrate per manufacturer's written instructions.
2.	Apply scratch coat and then bond coat over prepared lath or mesh.
3.	Set thin brick into mortar bed, ensuring full coverage on back of thin brick units.
4.	Maintain consistent spacing, coursing, joint width, and alignment.
B.	Thinset Method:
1.	Apply thinset latex-modified mortar to backer board as recommended in writing by manufacturer with notched trowel.
2.	Set thin brick, pressing firmly into mortar for full bond.
3.	Maintain consistent spacing, coursing, joint width, and alignment.
C.	Modular Panel Systems:
1.	General: Follow manufacturers' modular panel systems written instructions for the following: 
a.	Mortar: Type N or latex modified.
2.	Panels and Adhesive: Per panel manufacturer's written instructions.
3.	Interior Applications:
a.	Install, secure and prepare modular panels per manufacturer's written instructions.
b.	Provide polymer-modified mortar as recommended in writing by thin brick manufacturer.
c.	Trowel the mortar onto the panel and expose the coursing on the modular panel.
d.	Back face of thin brick must be dry and clean, free of dirt, oil, or any other foreign contaminant.
e.	Apply a uniform layer of mortar to the entire back surface of each thin brick with notched trowel immediately prior to setting.
f.	Place thin veneer on the panel leg and bag in joints with Type N or Type S mortar.
g.	Strike joints using a joint profile tool.
4.	Exterior Applications:
a.	Install, secure and prepare modular panels per manufacturer's written instructions.
b.	Back face of thin brick must be dry and clean, free of dirt, oil, or any other foreign contaminant.
c.	Where applicable, insert thin brick into panel grooves, rails, or tabs to support and align thin brick courses.
d.	Where panel requires mortar method installation, trowel the scratch coat onto the panel and expose the coursing on the modular panel.
e.	Thin brick to be applied within 10 minutes after thinset adhesive has been applied and before film begins to form on the thinset adhesive.
f.	Lay thin brick in course pattern as indicated on Drawings.
g.	Leave a uniform 3/8- to 1/2-inch gap at openings to allow for movement joint installation.
h.	Keep areas intended to receive sealant clean of thin brick, adhesive, and other materials during construction.
i.	Place thin brick on the panel leg and bag in joints with Type N or Type S mortar.
j.	Strike joints using a joint profile tool.
k.	Do not allow masonry units to bridge movement joints in substrate.
3.8	CONTROL AND EXPANSION JOINTS
A.	General: Install control- and expansion-joint materials in unit masonry as masonry progresses. Do not allow materials to span control and expansion joints without provision to allow for in-plane wall or partition movement.
B.	Form control joints in concrete masonry as follows:
1.	Install temporary foam-plastic filler in head joints, and remove filler when unit masonry is complete for application of sealant.
C.	Form expansion joints in brick as follows:
1.	Form open joint full depth of brick wythe and of width indicated on Drawings for installation of sealant and backer rod specified in Section 07 92 00 Joint Sealants
D.	Provide horizontal, pressure-relieving joints by either leaving an airspace or inserting a compressible filler of width indicated on Drawings for installing sealant and backer rod specified in Section 07 92 00 Joint Sealants
1.	Locate horizontal, pressure-relieving joints beneath shelf angles supporting masonry.
3.9	LINTELS
A.	Install steel lintels where indicated.
B.	Provide offset angle support lintels where indicated and where openings of more than 12 inches for brick-size units are indicated without structural steel or other supporting lintels.
C.	Provide minimum bearing of 8 inches at each jamb unless otherwise indicated.
3.10	FLASHING, WEEP HOLES, AND CAVITY VENTS
A.	General: Install embedded flashing and weep holes in masonry at shelf angles, lintels, ledges, other obstructions to downward flow of water in wall, and where indicated. Install cavity vents at shelf angles, ledges, and other obstructions to upward flow of air in cavities, and where indicated.
B.	Install flashing as follows unless otherwise indicated:
1.	Prepare masonry surfaces so they are smooth and free from projections that could puncture flashing. Where flashing is within mortar joint, place through-wall flashing on sloping bed of mortar and cover with mortar. Before covering with mortar, seal penetrations in flashing with adhesive, sealant, or tape as recommended by flashing manufacturer.
2.	At masonry-veneer walls, extend flashing through veneer, across airspace behind veneer, and up face of sheathing at least 8 inches; with upper edge tucked under water-resistive barrier or air barrier, lapping at least 4 inches. Fasten upper edge of flexible flashing to sheathing through termination bar.
3.	At lintels and shelf angles, extend flashing 6 inches minimum , to edge of next full unit at each end. At heads and sills, extend flashing 6 inches minimum, to edge of next full unit and turn ends up not less than 2 inches to form end dams.
4.	Install metal flashing termination beneath flexible flashing at exterior face of wall. Stop flexible flashing 1/2 inch back from outside face of wall, and adhere flexible flashing to top of metal flashing termination.
5.	Install reglets and nailers for flashing and other related construction where they are indicated to be built into masonry.
6.	Install weep holes in exterior wythes and veneers in head joints of first course of masonry immediately above embedded flashing.
a.	Use specified weep/cavity vent products to form weep holes.
b.	Space weep holes formed from plastic 24 inches o.c.
7.	Place cavity drainage material in airspace behind veneers to comply with configuration requirements for cavity drainage material in Accessories Article.
8.	Install cavity vents in head joints in exterior wythes at spacing indicated. Use specified weep/cavity vent products to form cavity vents.
a.	Close cavities off vertically and horizontally with blocking in manner indicated. Install through-wall flashing and weep holes above horizontal blocking.
3.11	FIELD QUALITY CONTROL
A.	Testing Agency: Engage a qualified testing agency to perform tests and inspections. Allow inspectors access to scaffolding and work areas as needed to perform tests and inspections. Retesting of materials that fail to comply with specified requirements will be at Contractor's expense.
B.	Inspections: Special inspections in accordance with Level in TMS 402 as required by Authority Having Jurisdiction.
1.	Begin masonry construction only after inspectors have verified proportions of site-prepared mortar.
2.	Place grout only after inspectors have verified compliance of grout spaces and of grades, sizes, and locations of reinforcement.
3.	Place grout only after inspectors have verified proportions of site-prepared grout.
4.	Testing Prior to Construction: One set of tests.
5.	Testing Frequency: One set of tests for each 5000 sq. ft. of wall area or portion thereof.
6.	Clay Masonry Unit Test: For each type of unit provided, in accordance with ASTM C67/C67M for compressive strength.
7.	Mortar Aggregate Ratio Test (Proportion Specification): For each mix provided, in accordance with ASTM C780.
3.12	REPAIRING, POINTING, AND CLEANING
A.	Remove and replace masonry units that are loose, chipped, broken, stained, or otherwise damaged or that do not match adjoining units. Install new units to match adjoining units; install in fresh mortar, pointed to eliminate evidence of replacement.
B.	Pointing: During the tooling of joints, enlarge voids and holes, except weep holes, and completely fill with mortar. Point up joints, including corners, openings, and adjacent construction, to provide a neat, uniform appearance. Prepare joints for sealant application, where indicated.
C.	In-Progress Cleaning: Clean unit masonry as work progresses by dry brushing to remove mortar fins and smears before tooling joints.
D.	Final Cleaning: After mortar is thoroughly set and cured, clean exposed masonry as follows:
1.	Remove large mortar particles by hand with wooden paddles and nonmetallic scrape hoes or chisels.
2.	Test cleaning methods on sample wall panel; leave one-half of panel uncleaned for comparison purposes. Obtain Architect's approval of sample cleaning before proceeding with cleaning of masonry.
3.	Clean exposed brick masonry surfaces as recommended by BIA Technical Notes Cleaning Brick Masonry. Clean exposed masonry from top down. Chemical cleaners shall be mixed and applied in accordance with the manufacturer's recommended specifications. Use of muriatic acid is prohibited.
4.	BRICK: PRIOR TO APPLICATION OF CHEMICAL CLEANERS, THE EXPOSED FACE OF THE BRICK SHALL BE THOROUGHLY SATURATED WITH WATER. APPLY CHEMICAL CLEANERS IN CAREFUL ACCORDANCE WITH MANUFACTURER'S INSTRUCTIONS. AFTER CLEANING OPERATIONS ARE COMPLETED, THOROUGHLY FLUSH THE FACE OF THE BRICK WITH WATER UNTIL ALL CLEANING RESIDUE HAS BEEN REMOVED.
5.	PROTECT ALL ADJACENT NON-MASONRY SURFACES FROM COMING INTO CONTACT WITH CHEMICAL CLEANERS. ANY DAMAGE TO ADJACENT SURFACES SHALL BE REPAIRED AT CONTRACTOR'S EXPENSE.

END OF SECTION