Section 04000.pdf

UNIT MASONRY 04200 - 1

SECTION 04200 - UNIT MASONRY

PART 1 - GENERAL

RELATED DOCUMENTS

Drawings and general provisions of Contract, including General and Division 1 Specification Sections, apply to this Section.

SUMMARY

This Section includes the following:

Clay unit masonry in the form of brick.

Concrete unit masonry, including unit masonry with vertical reinforcement.

Related Sections: The following sections contain requirements that relate to this Section:

Division 2 Section "Unit Pavers" for exterior applications.

Division 5 Section “Expansion Joint Cover Assemblies” for expansion joint cover assemblies.

Products installed but not furnished under this Section include the following:

Steel lintels in unit masonry are specified in Division 5 Section "Metal Fabrications."

Wood nailers and blocking built into unit masonry are specified in Division 6 Section “Rough Carpentry”.

Hollow metal frames in unit masonry openings are specified in Division 8 Section "Steel Doors and Frames."

SUBMITTALS

General: Submit the following in accordance with Conditions of Contract and Division 1 Specification Sections.

Product data for each different masonry unit, accessory, and other manufactured product indicated.

Shop drawings for reinforcing detailing fabrication, bending, and placement of unit masonry reinforcing bars. Comply with ACI 315 "Details and Detailing of Concrete Reinforcing" showing bar schedules, stirrup spacing, diagrams of bent bars, lateral ties, and arrangement of masonry reinforcement.

Samples for initial selection purposes of the following:

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Unit masonry samples in small-scale form showing full extent of colors and textures available for each different exposed masonry unit required.

Samples for verification purposes of the following:

Full-size units for each different exposed masonry unit required showing full range of exposed color, texture, and dimensions to be expected in completed construction.

Include size variation data verifying that actual range of sizes for brick falls within ASTM C 216 dimension tolerances for brick where modular dimensioning is indicated.

Accessories embedded in the masonry.

Material certificates for the following signed by manufacturer and Contractor certifying that each material complies with requirements.

Each different cement product required for mortar and grout including name of manufacturer, brand, type, and weight slips at time of delivery.

Each material and grade indicated for reinforcing bars.

Each type and size of joint reinforcement.

Each type and size of anchors, ties, and metal accessories.

Cold-weather construction procedures evidencing compliance with requirements specified in referenced unit masonry standard.

Hot-weather construction procedures evidencing compliance with requirements specified in referenced unit masonry standard.

QUALITY ASSURANCE

Unit Masonry Standard: Comply with ACI 530.1/ASCE 6 "Specifications for Masonry Structures," except as otherwise indicated.

Special inspection services to inspect foundations for compliance with dimensional tolerances as specified in the referenced unit masonry standard will not be required.

Fire Performance Characteristics: Where indicated, provide materials and construction identical to those of assemblies whose fire resistance has been determined per ASTM E 119 by a testing and inspecting organization, by equivalent concrete masonry thickness, or by another means, as acceptable to authorities having jurisdiction.

Single-Source Responsibility for Masonry Units: Obtain exposed masonry units of uniform texture and color, or a uniform blend within the ranges accepted for these characteristics, from one manufacturer for

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each different product required for each continuous surface or visually related surfaces.

Single-Source Responsibility for Mortar Materials: Obtain mortar ingredients of uniform quality, including color for exposed masonry, from one manufacturer for each cementitious component and from one source and producer for each aggregate.

DELIVERY, STORAGE, AND HANDLING

Deliver masonry materials to project in undamaged condition.

Store and handle masonry units off the ground, under cover, and in a dry location to prevent their deterioration or damage due to moisture, temperature changes, contaminants, corrosion, and other causes.

If units become wet, do not place until units are in an air-dried condition.

Store cementitious materials off the ground, under cover, and in dry location.

Store aggregates where grading and other required characteristics can be maintained and contamination avoided.

Store masonry accessories including metal items to prevent corrosion and accumulation of dirt and oil.

PROJECT CONDITIONS

Protection of Masonry: During erection, cover tops of walls, projections, and sills with waterproof sheeting at end of each day's work. Cover partially completed masonry when construction is not in progress.

Extend cover a minimum of 24 inches down both sides and hold cover securely in place.

Where one wythe of multiwythe masonry walls is completed in advance of other wythes, secure cover a minimum of 24 inches down face next to unconstructed wythe and hold cover in place.

Brace all walls during erection and provide protection against damage from wind and weather.

Do not apply uniform floor or roof loads for at least 12 hours and concentrated loads for at least 3 days after building masonry walls or columns.

Stain Prevention: Prevent grout, mortar, and soil from staining the face of masonry to be left exposed or painted. Remove immediately any grout, mortar, and soil that come in contact with such masonry.

Protect base of walls from rain-splashed mud and mortar splatter by means of coverings spread on ground and over wall surface.

Protect sills, ledges, and projections from mortar droppings.

Protect surfaces of window and door frames, as well as similar products with painted and integral

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finishes from mortar droppings.

Cold-Weather Construction: Comply with referenced unit masonry standard for cold-weather construction and the following:

Do not lay masonry units that are wet or frozen.

Remove masonry damaged by freezing conditions.

Hot-Weather Construction: Comply with referenced unit masonry standard.

PART 2 - PRODUCTS

MATERIALS, GENERAL

Comply with referenced unit masonry standard and other requirements specified in this Section applicable to each material indicated.

CLAY MASONRY UNITS

General: Comply with the following requirements applicable to each form of brick required:

Provide units without cores or frogs and with all exposed surfaces finished for ends of window sills, caps, and similar applications that expose brick surfaces that otherwise would be concealed from view.

Face Brick Standard: ASTM C 216 and as follows:

Grade SW.

Size: Provide bricks manufactured to the following actual dimensions within the tolerances specified in

ASTM C 216:

Standard Modular: 3-5/8 inches thick by 2-1/4 inches high by 7-5/8 inches long.

Exterior and Interior Applications for Field and Accent Face Brick: Use where brick is exposed, unless otherwise indicated.

Field Face Brick: Acme Brick, PEP BL600, Oxford Brown Velour or approved equal.

Accent Face Brick: Kansas Brick and Tile, 500 Cocoa Modular or approved equal.

All face brick color selections shall be approved by Contracting Officer.

Building (Common) Brick: ASTM C 62, and as follows:

Grade MW or Grade SW.

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Size: Provide bricks manufactured to the following actual dimensions within the tolerances specified in ASTM C 216:

Match size specified for face brick.

Application: Use where brick is indicated for concealed locations.

CONCRETE MASONRY UNITS

General: Comply with requirements indicated below applicable to each form of concrete masonry unit required.

Provide special shapes where indicated and as follows:

For lintels, corners, jambs, sash, control joints, headers, bonding, and other special conditions.

Square-edged units for outside corners, except where indicated as bullnose.

Size: Provide concrete masonry units complying with requirements indicated below for size that are manufactured to specified face dimensions within tolerances specified in the applicable referenced ASTM specification for concrete masonry units.

Concrete Masonry Units: Manufactured to specified dimensions of 3/8 inch less than nominal widths by nominal heights by nominal lengths indicated on drawings. Typical nominal face dimensions of 16" long x 8" high (15-5/8" x 7-5/8" actual) x thickness indicated.

Provide Type I, moisture-controlled units.

Hollow Load-Bearing Concrete Masonry Units: ASTM C 90, Grade N and as follows:

Unit Compressive Strength: Provide units with minimum average net area compressive strength indicated below:

2000 psi.

Weight Classification: Lightweight.

Exposed Faces: Manufacturer's standard color and texture, unless otherwise indicated.

MORTAR AND GROUT MATERIALS

Portland Cement: ASTM C 150, Type I or II, except Type III may be used for cold-weather construction.

Provide natural color cement.

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Masonry Cement: Masonry cement shall NOT be used.

Hydrated Lime: ASTM C 207, Type S.

Aggregate for Mortar: ASTM C 144, except for joints less than 1/4 inch use aggregate graded with 100 percent passing the No. 16 sieve.

Aggregate for Grout: ASTM C 404 or ASTM C 33, Size No. 1.

Water: Clean and potable.

Mortar Pigments: Natural and synthetic iron oxides and chromium oxides, compounded for use in mortar mixes. Use only pigments with a record of satisfactory performance in masonry mortars. Two mortar pigment colors will be selected, one for field face brick and another for accent face brick.

Products: Subject to compliance with requirements, provide one of the following:

Mortar Pigments:

True Tone Mortar Colors; Davis Colors.

Centurion Pigments; Lafarge Corporation.

SGS Mortar Colors; Solomon Grind-Chem Services, Inc.

REINFORCING STEEL

General: Provide reinforcing steel complying with requirements of referenced unit masonry standard and this article.

Steel Reinforcing Bars: Material and grade as follows:

Billet steel complying with ASTM A 615.

Grade 60.

Shop-fabricate reinforcing bars shown to be bent or hooked.

JOINT REINFORCEMENT

General: Provide joint reinforcement complying with requirements of referenced unit masonry standard and this article, formed from the following:

Zinc-Coated (Galvanized) Steel Wire: ASTM A 82 for uncoated wire and with ASTM A 641 for zinc coating of class indicated below:

Class 1 (0.40 oz. per square foot of wire surface).

Application: Use for interior masonry walls.

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Hot-Dip Galvanized Steel Wire: ASTM A 82 for uncoated wire and with ASTM A 153, Class B-2 (1.5 oz. per square foot of wire surface) for zinc coating applied after prefabrication into units.)

Application: Use for exterior masonry walls.

Description: Welded-wire units prefabricated with deformed continuous side rods and plain cross rods into straight lengths of not less than 10 feet, with prefabricated corner and tee units, and complying with requirements indicated below:

Width: Fabricate joint reinforcement in units with widths of approximately 2" less than nominal width of walls and partitions as required to provide mortar coverage of not less than 5/8" on joint faces exposed to exterior and 1/2" elsewhere.

Wire Diameter for Side Rods: 0.1483 inch (9 gage).

Wire Diameter for Cross Rods: 0.1483 inch (9 gage).

For single-wythe masonry provide type as follows with single pair of side rods:

Truss design with continuous diagonal cross rods spaced not more than 16 inches o.c.

For multiwythe masonry provide type as follows:

Tab design with single pair of side rods and rectangular box-type cross ties spaced not more than 16 inches o.c.; with side rods spaced for embedment within each face shell of backup wythe and ties extended to engage the outer wythe by at least 1-1/2 inches.

Use units with adjustable 2-piece rectangular ties at exterior walls and as indicated.

Manufacturers: Subject to compliance with requirements, provide joint reinforcement by one of the following:

AA Wire Products Co.

Dur-O-Wal, Inc.

Heckman Building Products, Inc.

Hohmann & Barnard, Inc.

National Wire Products Industries.

TIES AND ANCHORS, GENERAL

General: Provide ties and anchors specified in subsequent articles that comply with requirements for metal and size of referenced unit masonry standard and of this article.

Galvanized Carbon Steel Wire: ASTM A 82, coating class as required by referenced unit masonry standard, for wire ties and anchors in interior walls, unless otherwise indicated.

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Wire Diameter: 0.1875 inch.

Galvanized Steel Sheet:

ASTM A 366 (commercial quality) cold-rolled carbon steel sheet, hot-dip galvanized after fabrication to comply with ASTM A 153, Class B2 (for unit lengths over 15 inches) and Class B3 (for unit lengths under 15 inches), for sheet metal ties and anchors exposed to the weather and not completely embedded in mortar and grout.

Thickness of Steel Sheet Galvanized After Fabrication: Uncoated thickness of steel sheet hot-dip galvanized after fabrication: 0.0598 inch (16 gage).

Manufacturers: Subject to compliance with requirements, provide products by one of the following:

AA Wire Products Co.

Dur-O-Wal, Inc.

Heckman Building Products, Inc.

Hohmann & Barnard, Inc.

National Wire Products Industries.

BENT WIRE TIES

Individual units prefabricated from bent wire.

Type for Masonry Where Coursing Between Wythes Align: Unit ties bent from one piece of wire.

Type for Masonry Where Coursing Between Wythes Does Not Align: Adjustable ties composed of two parts, one with pintles, the other with eyes, maximum misalignment 1-1/4 inches.

ADJUSTABLE ANCHORS FOR CONNECTING MASONRY TO STRUCTURAL FRAMEWORK

General: Two-piece assemblies as described below allowing vertical or horizontal differential movement between wall and framework parallel to plane of wall, but resisting tension and compression forces perpendicular to it.

For anchorage to steel framework provide manufacturer's standard anchors with crimped 1/4-inch-diameter wire anchor section for welding to steel and triangular-shaped wire tie section sized to extend within 1 inch of masonry face and as follows:

Wire Diameter: 0.1875 inch.

EMBEDDED FLASHING MATERIALS

Copper-Fabric Laminate: Copper sheet of weight per sq. ft. indicated below, bonded with asphalt between 2 layers of glass fiber cloth.

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Weight: 5 oz.

Application: Use where flashing is fully concealed in masonry.

Adhesive for Flashings: Of type recommended by manufacturer of flashing material for use indicated.

Copper Fabric Laminate Flashing:

"Copper Fabric," Afco Products Inc.

"York Copper Fabric Flashing," York Manufacturing, Inc.

MISCELLANEOUS MASONRY ACCESSORIES

Nonmetallic Expansion Joint Strips: Premolded filler strips complying with ASTM D 1056, Type 2 (closed cell), Class A (cellular rubber and rubber-like materials with specific resistance to petroleum base oils), Grade 1 (compression-deflection range of 2-5 psi), compressible up to 35 percent, of width and thickness indicated.

Equal to W.R. Meadows, "Ceramar Flexible Foam".

Preformed Control Joint Gaskets: Material as indicated below, designed to fit standard sash block and to maintain lateral stability in masonry wall; size and configuration as indicated.

Styrene-Butadiene Rubber Compound: ASTM D 2000, Designation 2AA-805. Equal to Dur-O-Wall, "Regular".

Bond Breaker Strips: Asphalt-saturated organic roofing felt complying with ASTM D 226, Type I (No. 15 asphalt felt).

Weep Holes: Provide the following:

Wicking Material: Material as indicated below, in length required to produce 1/2 inch exposure on exterior and 12 inches in cavity between wythes:

Cotton sash cord.

Trim cotton card flush with wall following final cleaning.

INSULATION

Extruded Polystyrene Board Insulation: Rigid cellular polystyrene thermal insulation with closed cells and integral high-density skin, formed by the expansion of polystyrene base resin in an extrusion process to comply with ASTM C 578, Type IV; in manufacturer's standard lengths and widths; thicknesses as

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indicated.

"Styrofoam SM/SB"; Dow Chemical USA "Foamular 250"; UC Industries.

"Certifoam"; Minnesota Diversified Products, Inc.

Adhesive: Type recommended by insulation board manufacturer for application indicated.

MASONRY CLEANERS

Job-Mixed Detergent Solution: Solution of trisodium phosphate (1/2-cup dry measure) and laundry detergent (1/2-cup dry measure) dissolved in one gallon of water.

Proprietary Acidic Cleaner: Manufacturer's standard-strength, general-purpose cleaner designed for removing mortar/grout stains, efflorescence, and other new construction stains from new masonry surfaces without discoloring or damaging masonry surfaces; expressly approved for intended use by manufacturer of masonry units being cleaned.

Acidic cleaner shall be used only if approved by face brick manufacturer.

Products: Subject to compliance with requirements, provide the following:

"Sure Klean No. 600 Detergent," ProSoCo, Inc.

MORTAR AND GROUT MIXES

General: Do not add admixtures including coloring pigments, air-entraining agents, accelerators, retarders, water repellent agents, antifreeze compounds, or other admixtures, unless otherwise indicated.

Do not use calcium chloride in mortar or grout.

Mortar for Unit Masonry: Comply with ASTM C 270, Proportion Specification for mortar types indicated below:

Limit cementitious materials in mortar to portland cement-lime.

Type S: Over 1/4 up to 1/2 part lime per one part of portland cement and 3 to 4-1/2 parts sand.

All mortar at interior CMU walls, including interior wythe of exterior walls, shall be Type

S, natural-colored mortar.

Type N: One part lime per one part of portland cement and 4-1/2 to 6 parts sand.

All mortar for field face brick and accent face brick block shall be Type N, colored mortar.

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Pigmented Mortar: Select and proportion pigments with other ingredients to produce color as selected by Contracting Officer from manufacturer's full range of colors.

Limit pigments to the following percentages of cement content by weight:

For mineral oxide pigments and portland cement-lime mortar, not more than 10 percent.

Grout for Unit Masonry: Comply with ASTM C 476 and referenced unit masonry standard for grout in construction of reinforced and non-reinforced unit masonry.

Use grout of consistency indicated or if not otherwise indicated, of consistency (fine or coarse) at time of placement which will completely fill all spaces intended to receive grout.

Use fine grout in grout spaces less than 2" in horizontal direction, unless otherwise indicted.

Use coarse grout in grout spaces 2" or more in least horizontal dimension, unless otherwise

All grout for vertical reinforcement and bond beams shall be 3000 psi concrete unless otherwise approved by Contracting Officer. Design mix shall be as indicated in General Structural Notes.

Test cylinders in accordance with Section 03310.

PART 3 - EXECUTION

EXAMINATION

Examine conditions, with Installer present, for compliance with requirements for installation tolerances and other specific conditions, and other conditions affecting performance of unit masonry.

Examine rough-in and built-in construction to verify actual locations of piping connections prior to installation.

Do not proceed until unsatisfactory conditions have been corrected.

INSTALLATION, GENERAL

Comply with referenced unit masonry standard and other requirements indicated applicable to each type of installation included in Project.

Wetting Clay Brick: Wet brick made from clay or shale which have ASTM C 67 initial rates of absorption (suction) of more than 30 grams per 30 square inches per minute. Use wetting methods which ensure each clay masonry unit being nearly saturated but surface dry when laid.

Do not wet concrete masonry units.

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Cleaning Reinforcing: Before placing, remove loose rust, ice and other coatings from reinforcing.

Thickness: Build cavity and composite walls and other masonry construction to the full thickness shown.

Build single-wythe walls to the actual thickness of the masonry units, using units of nominal thickness indicated.

Build chases and recesses as shown or required to accommodate items specified in this and other Sections of the Specifications, including work of other trades. Provide not less than 8 inches of masonry between chase or recess and jamb of openings and between adjacent chases and recesses.

Leave openings for equipment to be installed before completion of masonry. After installation of equipment, complete masonry to match construction immediately adjacent to the opening.

Cut masonry units with motor-driven saws to provide clean, sharp, unchipped edges. Cut units as required to provide continuous pattern and to fit adjoining construction. Use full-size units without cutting where possible.

CONSTRUCTION TOLERANCES

Comply with construction tolerances of referenced unit masonry standard.

LAYING MASONRY WALLS

Lay out walls in advance for accurate spacing of surface bond patterns with uniform joint widths and for accurate locating of openings, movement-type joints, returns, and offsets. Avoid the use of less-than-half-size units at corners, jambs, and where possible at other locations.

Lay up walls to comply with specified construction tolerances, with courses accurately spaced and coordinated with other construction.

Bond Pattern for Exposed Masonry: Lay exposed masonry in the following bond pattern; do not use units with less that nominal 4-inch horizontal face dimensions at corners or jambs.

Running bond with vertical joint in each course centered on units in courses above and below, with special bond pattern as indicated at exterior face brick.

Lay concealed masonry with all units in a wythe in running bond or bonded by lapping not less than 2 inches. Bond and interlock each course of each wythe at corners. Do not use units with less than nominal 4-inch horizontal face dimensions at corners or jambs.

Stopping and Resuming Work: In each course, rack back 1/2-unit length for one-half running bond; do not tooth. Clean exposed surfaces of set masonry, wet clay masonry units lightly (if required), and remove loose masonry units and mortar prior to laying fresh masonry.

Built-In Work: As construction progresses, build-in items specified under this and other Sections of the

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Specifications. Fill in solidly with masonry around built-in items.

Fill space between hollow metal frames and masonry solidly with mortar, unless otherwise

Where built-in items are to be embedded in cores of hollow masonry units, place a layer of metal lath in the joint below and rod mortar or grout into core.

Fill cores in hollow concrete masonry units with grout 3 courses (24 inches) under bearing plates, beams, lintels, posts, and similar items, unless otherwise indicated.

Rake back mortar at all inside corners of walls and caulk joint with sealant to match appearance of adjacent tooled mortar joints.

MORTAR BEDDING AND JOINTING

Lay solid brick size masonry units with completely filled bed and head joint; butter ends with sufficient mortar to fill head joints and shove into place. Do not slush head joints.

Lay hollow concrete masonry units as follows:

With full mortar coverage on horizontal and vertical face shells.

Bed webs in mortar in starting course on footings and in all courses of piers, columns, and pilasters, and where adjacent to cells or cavities to be filled with grout.

For starting course on footings where cells are not grouted, spread out full mortar bed including areas under cells.

Maintain joint widths shown, except for minor variations required to maintain bond alignment. If not shown, lay walls with 3/8" joints.

Cut joints flush for masonry walls to be concealed or to be covered by other materials, unless otherwise indicated.

Tool exposed joints slightly concave using a jointer larger than joint thickness, unless otherwise indicated.

Rake out mortar in preparation for application of sealants where shown or specified.

Remove masonry units disturbed after laying; clean and reset in fresh mortar. Do not pound corners or jambs to shift adjacent stretcher units which have been set in position. If adjustments are required, remove units, clean off mortar and reset in fresh mortar.

Piers, columns and wall ends shall be laid with regular joint widths regardless of nominal dimensions shown on the drawings. Fat joints will not be permitted.

STRUCTURAL BONDING OF MULTIWYTHE MASONRY

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Use continuous horizontal joint reinforcement installed in horizontal mortar joints for bond tie between wythes.

Corners: Provide interlocking masonry unit bond in each course at corners, unless otherwise shown.

Provide continuity with horizontal joint reinforcement at corners using prefabricated "L" units, in addition to masonry bonding.

Intersecting and Abutting Walls: Unless vertical expansion or control joints are shown at juncture, provide same type of bonding specified for structural bonding between wythes and space as follows:

Provide continuity with horizontal joint reinforcement using prefabricated "T" units.

Nonbearing Interior Partitions: Build full height of story to underside of solid floor or roof structure above and as follows:

Install pressure-relieving joint filler in joint between top of partition and underside of structure above.

CAVITIES/AIR SPACES

Keep cavities/air spaces clean of mortar droppings and other materials during construction. Strike joints facing cavities/air spaces flush.

Tie exterior wythe to backup with continuous horizontal joint reinforcing using adjustable 2-piece rectangular ties, installed in mortar joints at not more than 16 inches o.c. vertically.

CAVITY WALL INSULATION

On units of plastic insulation, install small pads of adhesive spaced approximately 1'-0" o.c. both ways on inside face or attach to inside face with plastic fasteners designed for this purpose. Fit courses of insulation between wall ties and other confining obstructions in cavity, with edges butted tightly both ways. Press units firmly against inside wythe of masonry or other construction as shown.

Fill all cracks and open gaps in insulation with crack sealer compatible with insulation and masonry.

HORIZONTAL JOINT REINFORCEMENT

General: Provide continuous horizontal joint reinforcement as indicated. Install longitudinal side rods in mortar for their entire length with a minimum cover of 5/8 inch on exterior side of walls, 1/2 inch elsewhere. Lap reinforcing a minimum of 6 inches.

Cut or interrupt joint reinforcement at control and expansion joints, unless otherwise indicated.

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Provide continuity at corners and wall intersections by use of prefabricated "L" and "T" sections. Cut and bend reinforcement units as directed by manufacturer for continuity at returns, offsets, pipe enclosures, and other special conditions.

Reinforce walls with continuous horizontal joint reinforcement.

Space continuous horizontal reinforcement to comply with referenced unit masonry standard and as follows:

For multi-wythe walls (solid or cavity) where continuous horizontal reinforcement acts as structural bond or tie between wythes, space reinforcement as required by code or standard but not more than 16" o.c. vertically.

For single-wythe walls, space reinforcement at 16" o.c. vertically, unless otherwise indicated.

For parapets, space reinforcement at 8" o.c. vertically, unless otherwise indicated.

Reinforce masonry openings greater than 1'0" wide, with horizontal joint reinforcement placed in 2 horizontal joints approximately 8" apart, immediately above the lintel and immediately below the sill.

Extend reinforcement a minimum of 2'0" beyond jambs of the opening except at control joints.

In addition to wall reinforcement, provide additional reinforcement at openings as required to comply with the above.

ANCHORING MASONRY TO STRUCTURAL MEMBERS

Anchor masonry to structural members where masonry abuts or faces structural members to comply with the following:

Provide an open space not less than 1 inch in width between masonry and structural member, unless otherwise indicated. Keep open space free of mortar or other rigid materials.

Anchor masonry to structural members with flexible anchors embedded in masonry joints and attached to structure.

Space anchors as indicated, but not more than 24 inches o.c. vertically and 36 inches o.c.

horizontally.

MOVEMENT (CONTROL AND EXPANSION) JOINTS

General: Install control and expansion joints in unit masonry where indicated. Build in related items as the masonry progresses. Do not form a continuous span through movement joints unless provisions are made to prevent in-plane restraint of wall or partition movement.

Form control joints in masonry as follows:

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Install preformed control joint gaskets designed to fit standard sash block.

Build in joint fillers where indicated.

Form open joint of width indicated but not less than 3/8 inch for installation of sealant and backer rod specified in Division 7 Section "Joint Sealers." Maintain joint free and clear of mortar.

LINTELS

Install steel lintels where indicated.

Provide masonry lintels where shown and wherever openings of more than 1'-0" for brick size units and 2'-0" for block size units are shown without structural steel or other supporting lintels. Provide precast or formed-in-place masonry lintels. Cure precast lintels before handling and installation. Temporarily support formed-in-place lintels.

For hollow concrete masonry unit walls, use specially formed bond beam units with reinforcement bars placed as indicated and filled with coarse grout.

Provide minimum bearing of 8 inches at each jamb, unless otherwise indicated.

FLASHING/WEEP HOLES

General: Install embedded flashing and weep holes in masonry at shelf angles, lintels, ledges, other obstructions to the downward flow of water in the wall, and where indicated.

Prepare masonry surfaces so that they are smooth and free from projections that could puncture flashing.

Place through-wall flashing on sloping bed of mortar and cover with mortar. Seal penetrations in flashing with adhesive/sealant/tape as recommended by flashing manufacturer before covering with mortar.

Install flashings to comply with manufacturer's instructions and as follows:

At lintels and shelf angles, extend flashing a minimum of 4 inches into masonry at each end.

Extend flashing from exterior face of outer wythe of masonry, through the outer wythe, turned up a minimum of 4 inches, and through the inner wythe to within 1/2 inches of the interior face of the wall in exposed masonry. Where interior surface of inner wythe is concealed by furring, carry flashing completely through the inner wythe and turn up approximately 2 inches, unless otherwise

At heads and sills, extend flashing as specified above unless otherwise indicated but turn up ends not less than 2 inches to form a pan.

Cut off flashing flush with face of wall after masonry wall construction is completed.

Install weep holes in the head joints in exterior wythes of the first course of masonry immediately above embedded flashings and as follows:

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Form weep holes with product specified in Part 2 of this Section.

Space weep holes 24 inches o.c.

Install reglets and nailers for flashing and other related construction where shown to be built into masonry.

INSTALLATION OF REINFORCED UNIT MASONRY

General: Install reinforced unit masonry to comply with requirements of referenced unit masonry standard.

Placing Reinforcement: Clean reinforcement of loose rust, mill scale, earth, ice or other materials which will reduce bond to mortar or grout. Do not use reinforcement bars with kinks or bends not shown on drawings or final shop drawings, or bars with reduced cross-section due to excessive rusting or other causes.

Position reinforcement accurately at the spacing indicated. Support and secure vertical bars against displacement. Horizontal reinforcement may be placed as the masonry work progresses. Where vertical bars are shown in close proximity, provide a clear distance between bars of not less than the nominal bar diameter or 1" (whichever is greater).

Splice reinforcement bars where shown; do not splice at other points unless acceptable to the Contracting Officer. Provide lapped splices, unless otherwise indicated. In splicing vertical bars or attaching to dowels, lap ends, place in contact and wire tie.

Provide not less than minimum lap indicated.

Maintain vertical continuity of core or cell cavities, which are to be reinforced and grouted, to provide minimum clear dimension indicated and to provide minimum clearance and grout coverage for vertical reinforcement bars. Keep cavities free of mortar. Solidly bed webs in mortar where adjacent to reinforced cores or cells.

Where horizontal reinforced beams (bond beams) are shown, use special units or modify regular units to allow for placement of continuous horizontal reinforcement bars. Place small mesh expanded metal lath or wire screening in mortar joints under bond beam courses over cores or cells of non-reinforced vertical cells, or provide units with solid bottoms.

Use "Fine Grout" per ASTM C 476 for filling spaces less than 4" in one or both horizontal directions.

Use "Coarse Grout" per ASTM C 476 for filling 4" spaces or larger in both horizontal directions.

Grouting Technique: Use low-lift grouting techniques subject to requirements which follow:

Provide minimum clear dimension of 2" and clear area of 8 square inches in vertical cores to be grouted.

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Place vertical reinforcement prior to grouting cores of CMU. Extend above elevation of maximum grout height as required for splicing. Support in position at vertical intervals not exceeding 192 bar diameters nor 10 ft.

Do not exceed 4' height, or if bond beam occurs below 4' height, stop pour at course below bond beam.

Grout cores using chute or container with spout. Rod or vibrate grout during placing. Place grout continuously; do not interrupt pouring of grout for more than one hour. Terminate grout placing 1-1/2" below top course of pour.

Bond Beams: Stop grout in vertical cells 1-1/2" below bond beam course. Place horizontal reinforcement in bond beams; lap at corners and intersections as shown. Place grout in bond beam course before filling vertical cores above bond beam.

REPAIRING, POINTING, AND CLEANING

Remove and replace masonry units that are loose, chipped, broken, stained, or otherwise damaged or if units do not match adjoining units. Install new units to match adjoining units and in fresh mortar or grout, pointed to eliminate evidence of replacement.

Pointing: During the tooling of joints, enlarge any voids or holes, except weep holes, and completely fill with mortar. Point-up all joints including corners, openings, and adjacent construction to provide a neat, uniform appearance, prepared for application of sealants.

Final Cleaning: After mortar is thoroughly set and cured, clean exposed masonry as follows:

Remove large mortar particles by hand with wooden paddles and nonmetallic scrape hoes or chisels.

Test cleaning methods on sample wall panel; leave 1/2 panel uncleaned for comparison purposes.

Obtain Contracting Officer’s approval of sample cleaning before proceeding with cleaning of masonry.

Protect adjacent nonmasonry surfaces from contact with cleaner by covering them with liquid strippable masking agent, polyethylene film, or waterproof masking tape.

Wet wall surfaces with water prior to application of cleaners; remove cleaners promptly by rinsing thoroughly with clear water.

Clean brick by means of bucket and brush hand-cleaning method described in BIA "Technical Note No. 20 Revised" using the following masonry cleaner:

Job-mixed detergent solution.

Proprietary acidic cleaner; apply in compliance with directions of acidic cleaner manufacturer. Acidic cleaner shall be used only if approved by face brick manufacturer.

UNIT MASONRY 04200 - 19

Clean concrete masonry by means of cleaning method indicated in NCMA TEK 45 applicable to type of stain present on exposed surfaces.

Protection: Provide final protection and maintain conditions, in a manner acceptable to Installer, that ensure unit masonry is without damage and deterioration at time of Substantial Completion.

END OF SECTION 04200