SECTION UNIT MASONRY

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1 PART 1 GENERAL 1.01 SECTION INCLUDES A. Concrete Block. B. Architectural Concrete Block. C. Clay Facing Brick. D. Mortar and Grout. E. Reinforcement and Anchorage. F. Flashings. G. Accessories ADMINISTRATIVE REQUIREMENTS SECTION A. Preinstallation Meeting: Convene a preinstallation meeting one week before starting work of this section; require attendance by all relevant installers SUBMITTALS A. See Section Administrative Requirements, for submittal procedures. B. Product Data: Provide data for dampproofing, masonry units, fabricated wire reinforcement, mortar, and masonry accessories. C. Samples: Submit four samples of facing brick and architectural block units to illustrate color, texture, and extremes of color range. D. Manufacturer's Certificate: Certify that masonry units meet or exceed specified requirements. E. Shop Drawings: Stainless Steel Drip Flashings; Indicate material profile, jointing pattern, jointing details, fastening methods, flashing terminations, and installation details.' 1.04 QUALITY ASSURANCE A. Comply with provisions of ACI 530/530.1/ERTA, except where exceeded by requirements of the contract documents. B. Comply with provisions of the Brick Industry Association (BIA) Technical Notes on Brick Construction, except where exceeded by requirements of the contract documents. C. Comply with provisions of National Concrete Masonry Association (NCMA) Tek Notes, except where exceeded by requirements of the contract documents MOCK-UP A. Construct a masonry wall as a mock-up panel sized 8 feet long by 6 feet high; include reinforcement, mortar and accessories, structural backup, wall openings, flashings, wall insulation, and weather barrier in mock-up. Opening shall be a minimum of 2' x2' and illustrate complete head, jamb and sill masonry and flashing details. Coordinate with all related Sections. B. Build, protect and retain mock-up during construction as a standard for judging the completed work. C. Locate where directed. D. Mock-up may not remain as part of the Work. E. Mock- up must be approved before proceeding with work. F. Do not conceal critical parts of the mock- up, such as flashings and end dams prior to Architects observing work DELIVERY, STORAGE, AND HANDLING A. Deliver, handle, and store masonry units by means that will prevent mechanical damage and contamination by other materials. PWA oo I 1

2 PART 2 PRODUCTS 2.01 CONCRETE MASONRY UNITS A. Concrete Block: Comply with referenced standards and as follows: 1. Size: Standard units with nominal face dimensions of 16 x 8 inches and nominal depths as indicated on the drawings for specific locations. 2. Special Shapes: Provide non-standard blocks configured for lintels, headers, control joint edges, and bull nose external corners on interior block walls. 3. Load-Bearing and Non Load Bering Units: ASTM C90, normal weight. a. Both hollow and solid block. All block hollow except 4 inch nominal b. Exposed faces: Manufacturer's standard color and texture. Use split face texture where indicated BRICK UNITS A. Facing Brick: ASTM C216, Type FBX, Grade SW. 1. Color and texture: Match existing color, texture and blend. 2. Actual size: 3-5/8" x 7-5/8" x 2-1/4". 3. Special shapes: Molded units as required by conditions indicated, unless standard units can be sawn to produce equivalent effect MORTAR AND GROUT MATERIALS A. Portland Cement: ASTM C150, Type I. 1. Not more than 0.60 percent alkali. B. Hydrated Lime: ASTM C207, Type S. C. Mortar Aggregate: ASTM C144. D. Grout Aggregate: ASTM C404. E. Water: Clean and potable REINFORCEMENT AND ANCHORAGE A. Manufacturers of Joint Reinforcement and Anchors: 1. Blok-Lok Limited: 2. Hohmann & Barnard, Inc (including Dur-0-Wal brand): 3. WIRE-BOND: 4. Heckmann Building Products, Inc: 5. Substitutions: See Section Product Requirements. B. Reinforcing Steel: ASTM A615/A615M Grade 60 (420) deformed billet bars; uncoated. C. Vertical Rebar Positioners: H and B- RB Rebar Positioner and H and B Twin Rebar Positioner. D. Horizontal Rebar Positioner: Heckmann Building Products #379 Centering clip for horizontal rebar. E. Rebar Lap- Joint Ties: H and B Spyra- Lox Rebar Lap- Joint Ties F. Joint Reinforcement: Use ladder type joint reinforcement where vertical reinforcement is involved and truss type elsewhere, unless otherwise indicated. G. Partition Top Anchor: as shown on structural drawings. H. Single Wythe Joint Reinforcement: Ladder type; ASTM A 82/A 82M steel wire, mill galvanized to ASTM A 641 /A 641 M, Class 3; inch side rods with inch cross rods; width as required to provide not more than 1 inch and not less than 1/2 inch of mortar coverage on each exposure. I. Adjustable Multiple Wythe Joint Reinforcement: Ladder type with adjustable ties spaced at 16 in on center and fabricated with moisture drip; ASTM A 82/A 82M steel wire, hot dip galvanized after fabrication to ASTM A 153/153M, Class B; inch side rods with inch cross rods and adjustable components of inch wire; width of components as required to PWA I 2

3 provide not more than 1 inch and not less than 1/2 inch of mortar coverage from each masonry face. (H and B 270 Ladder- Adjustable Ladder Eye and Pintle ties). 1. Vertical adjustment: Not less than 2 inches. J. Brick Expansion/ Control Joint Stabilizers: H and B Slip- Set Stabilizer, Type 304 Stainless Steel FLASHINGS A. Rubberized Asphalt Flashing: Self-adhering polymer-modified asphalt sheet; inch total thickness; with cross-linked polyethylene top and bottom surfaces. 1. Manufacturers: a. H and B; Product Textroflash; (Basis of Design). b. Carlisle; Product CCW TWF; c. WR Grace; Product Perm-A-Barrier; d. Substitutions: See Section Product Requirements. B. Stainless Steel Drip Edge Pan Flashing: Custom flashing as shown on the drawings, ASTM A666, Type 304, soft temper; 26 gage (0.45 mm) thick; finish 2B to 2D. Coordinate with Section , Sheet Metal Flashing and Trim. C. Lap Sealant: Polyurethane type as specified in Section ACCESSORIES A. Preformed Control Joints: Rubber material. Provide with corner and tee accessories, fused joints. 1. Manufacturers: a. Blok-Lok Limited: b. Hohmann & Barnard, Inc (including Dur-0-Wal brand); Product RS Series- Rubber Control; Joint: c. WIRE-BOND: d. Substitutions: See Section Product Requirements. B. Joint Filler: Specified in Section C. Cavity Mortar Control: Semi-rigid polyethylene or polyester mesh panels, sized to thickness of wall cavity, and designed to prevent mortar droppings from clogging weeps and cavity vents and allow proper cavity drainage. 1. Mortar Diverter: Panels designed for installation at flashing locations. a. Manufacturers: 1) Mortar Net USA, Ltd; Mortar Net with Insect Barrier: 2) H and B; Product Mortar Trap; 3) Keene Building Products; Product Keene Stone; 4) Substitutions: See Section Product Requirements. D. Weeps: Polyester mesh. 1. Manufacturers: a. CavCiear/Archovations, Inc: b. Mortar Net USA, Ltd; Mortar Net Weep Vents: c. Substitutions: See Section Product Requirements. E. Cleaning Solution: Non-acidic, not harmful to masonry work or adjacent materials. Use only products and methods approved in writing by the masonry manufacturer for each type of masonry being cleaned. F. Primer for Rubberized Asphalt Flashing: H and B Self- Adhering Primer. G. Mastic/ sealant: H and B Mastic. H. Termination Bar: H and B T-2, Aluminum. I. Weather Barrier: Coordinate with Section , Weather Barriers. PWA I 3

4 2.07 MORTAR AND GROUT MIXES A. Mortar for Unit Masonry: ASTM C270, using the Proportion Specification. 1. All masonry block: Type S. 2. Facing brick masonry: Type N. B. Grout: ASTM C476. Consistency required to fill completely 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. C. Admixtures: Use admixtures only if approved by Architect in writing. Add to mixture at manufacturer's recommended rate and in accordance with manufacturer's instructions; mix uniformly. D. Mixing: Use mechanical batch mixer and comply with referenced standards. PART 3 EXECUTION 3.01 EXAMINATION A. Verify that field conditions are acceptable and are ready to receive masonry. B. Verify that related items provided under other sections are properly sized and located. C. Verify that built-in items are in proper location, and ready for roughing into masonry work PREPARATION A. Direct and coordinate placement of metal anchors supplied for installation under other sections. B. Provide temporary bracing during installation of masonry work. Maintain in place until building structure provides permanent bracing COLD AND HOT WEATHER REQUIREMENTS A. Comply with requirements of ACI 530/530.1/ERTA or applicable building code, whichever is more stringent COURSING A. Establish lines, levels, and coursing indicated. Protect from displacement. B. Maintain masonry courses to uniform dimension. Form vertical and horizontal joints of uniform thickness. C. Concrete Masonry Units: 1. Bond: Running. 2. Coursing: One unit and one mortar joint to equal 8 inches. 3. Mortar Joints: Concave. D. Brick Units: 1. Bond: Running. 2. Coursing: Three units and three mortar joints to equal 8 inches. 3. Mortar Joints: Concave PLACING AND BONDING A. Lay solid masonry units in full bed of mortar, with full head joints, uniformly jointed with other work. B. Lay hollow masonry units with face shell bedding on head and bed joints. C. Buttering corners of joints or excessive furrowing of mortar joints is not permitted. D. Remove excess mortar and mortar smears as work progresses. E. Interlock intersections and external corners. F. Do not shift or tap masonry units after mortar has achieved initial set. Where adjustment must be made, remove mortar and replace. G. Perform job site cutting of masonry units with proper tools to provide straight, clean, unchipped edges. Prevent broken masonry unit corners or edges. PWA I 4

5 H. Cut mortar joints flush where weather barrier is applied. Coordinate with Section , Weather barriers. I. Isolate top joint of masonry partitions from horizontal structural framing members and slabs or decks with compressible joint filler WEEPS/CAVITY VENTS A. Install weeps in veneer and cavity walls at 24 inches on center horizontally above through-wall flashing, above shelf angles and lintels, and at bottom of walls. Install in accordance with manufacturers printed installation instructions CAVITY MORTAR CONTROL A. Do not permit mortar to drop or accumulate into cavity air space or to plug weep/cavity vents. B. For cavity walls, build inner wythe ahead of outer wythe to accommodate accessories. C. Install cavity mortar diverter at base of cavity and at other flashing locations as recommended by manufacturer to prevent mortar droppings from blocking weep/cavity vents. Install in accordance with manufacturers printed installation instructions REINFORCEMENT AND ANCHORAGE - GENERAL A. Unless otherwise indicated on drawings or specified under specific wall type, install horizontal joint reinforcement 16 inches on center. B. Place masonry joint reinforcement in first horizontal joints above and below openings. Extend minimum 16 inches each side of opening. C. Place continuous joint reinforcement in first joint below top of walls. D. Lap joint reinforcement ends minimum 6 inches REINFORCEMENT AND ANCHORAGE - SINGLE WYTHE MASONRY A. Install horizontal joint reinforcement 16 inches on center. B. Place masonry joint reinforcement in first horizontal joints above and below openings. Extend minimum 16 inches each side of opening. C. Place continuous joint reinforcement in first joint below top of walls. D. Lap joint reinforcement ends minimum 6 inches REINFORCEMENT AND ANCHORAGE - MASONRY VENEER A. Install horizontal joint reinforcement 16 inches on center. B. Place masonry joint reinforcement in first horizontal joints above and below openings. Extend minimum 16 inches each side of opening. C. Place continuous joint reinforcement in first joint below top of walls. D. Lap joint reinforcement ends minimum 6 inches. E. Masonry Back-Up: Embed anchors in masonry back-up to bond veneer at maximum sq ft of wall surface per anchor. Place additional anchors at perimeter of openings and ends of panels, so maximum spacing of anchors is 8 inches on center MASONRY FLASHINGS A. Whether or not specifically indicated, install masonry flashing to divert water to exterior at all locations where downward flow of water will be interrupted such as at lintels. B. Remove or cover protrusions or sharp edges that could puncture flashings. C. Install stainless steel drip edge flashing specified in Section , in full bed of mastic. D. Lap stainless steel seams 4 inches and "bayonet" seal watertight with mastic. E. Extend stainless steel metal flashings through exterior face of masonry and turn down to form drip as shown on drawings. Install joint sealer with bond breaker below drip edge to prevent moisture migration under flashing. PWA I 5

6 F. Apply membrane flashing primer to substrate at approximately 150 s.f. per gallon. Let primer dry for approximately 30 minutes or when dry to touch. Re- prime surface if primed area has been left exposed for 24 hours. G. Apply membrane to primed surfaces including drip edge flashing, in sections of 8ft. in length or less. Lap all seams a minimum of three inches. Use a roller to firmly press membrane onto surface without air pockets. Neatly apply mastic on top of the overlap at 1/8"-1/4" thickness x 1-1/2" wide. H. Extend throughwall membrane flashings full width at such interruptions and turn up at least [8] inches onto back up wall. Use a roller to firmly press membrane onto surface of wall and drip edge flashing without air pockets or wrinkles. Neatly apply mastic on top at 1/8"-1/4" thickness x 1-1/2 " wide. Install termination bar at top of flashing and seal. Turn both stainless steel and membrane flashings up at ends a minimum of 4 inches to form watertight pan. I. Hold the outer edge of membrane back 3/4 inch from the exposed face of wall and install a neatly tooled bead of mastic along the front edge of membrane using a caulking gun LINTELS A. Install loose steel lintels over openings. See Structural Drawings for sizes GROUTED COMPONENTS A. Lap splices as shown on structural drawings. Tie together with Rebar Lap- Joint Ties. B. Support and secure reinforcing bars from displacement. Maintain position within 1/2 inch of dimensioned position. C. Place and consolidate grout fill without displacing reinforcing CONTROL AND EXPANSION JOINTS A. Do not continue horizontal joint reinforcement through control and expansion joints. B. Install preformed control joint device in continuous lengths. Seal butt and corner joints in accordance with manufacturer's instructions. C. Form expansion joint as detailed BUILT-IN WORK A. As work progresses, install built-in metal door frames, glazed frames, anchor bolts, and plates and other items to be built into the work and furnished under other sections. B. Install built-in items plumb, level, and true to line. C. Bed anchors of metal door and glazed frames in adjacent mortar joints. Fill frame voids solid with grout. 1. Fill adjacent masonry cores with grout minimum 12 inches from framed openings. D. Do not build into masonry construction organic materials that are subject to deterioration TOLERANCES (FOR SINGLE WYTHE MASONRY VERIFY WITH ARCHITECT WALL SURFACE REQUIRING THE MORE STRINGENT TOLERANCE) A. Maximum Variation from Alignment of Columns: 1/4 inch. B. Maximum Variation From Unit to Adjacent Unit: 1/16 inch. C. Maximum Variation from Plane of Wall: 1/4 inch in 10ft and 1/2 inch in 20ft or more. D. Maximum Variation from Plumb: 1/4 inch per story non-cumulative; 1/2 inch in two stories or more. E. Maximum Variation from Level Coursing: 1/8 inch in 3ft and 1/4 inch in 10ft; 1/2 inch in 30ft. F. Maximum Variation of Joint Thickness: 1/8 inch in 3ft. G. Maximum Variation from Cross Sectional Thickness of Walls: 1/4 inch. PWA I 6

7 3.17 CUTTING AND FITTING A. Cut and fit for pipes, conduit, and sleeves. Coordinate with other sections of work to provide correct size, shape, and location. B. Obtain approval prior to cutting or fitting masonry work not indicated or where appearance or strength of masonry work may be impaired FIELD QUALITY CONTROL A. Clay Masonry Unit Tests: Test each variety of clay masonry in accordance with ASTM C67 requirements, sampling 5 randomly chosen units for each 50,000 installed. B. Concrete Masonry Unit Tests: Test each variety of concrete unit masonry in accordance with ASTM C140 for conformance to requirements of this specification. C. Mortar Tests: Test each type of mortar in accordance with ASTM C780, testing with same frequency as masonry samples CLEANING A. Remove excess mortar and mortar droppings. B. Replace defective mortar. Match adjacent work. C. Clean soiled surfaces with cleaning solution. D. Use non-metallic tools in cleaning operations PROTECTION A. Without damaging completed work, provide protective boards at exposed external corners that are subject to damage by construction activities. END OF SECTION PWA 201 i

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