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    SECTION 04300

    UNIT MASONRY SYSTEM

   PART 1 - GENERAL

   1.01 SECTION INCLUDES

    Concrete masonry units.

    Decorative and Prefaced concrete masonry units.

    Reinforcement, anchorage, and accessories.

   1.02 PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

    A. Section 03100 - Concrete Formwork: Special anchors for placement in concrete.

   1.03 PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

    A. Section 05120 - Structural Steel: Placement of steel anchors for masonry.

    B. Section 05500 - Metal Fabrications: Placement of loose steel lintels.

    C. Section 08130 - Stainless Steel Doors and Frames: Placement of frames.

   1.04 RELATED SECTIONS

    A. Section 01400 - Quality Control.

    B. Section 01410 - Testing Laboratory Services: Testing laboratory.

    C. Section 04100 - Mortar: Mortar and grout.

    D. Section 04270 - Glass Unit Masonry.

    E. Section 07160 - Bituminous Dampproofing: Dampproofing parged masonry surfaces.

    F. Section 07900 - Joint Sealers: Rod and sealant at control and expansion joints.

   1.05 REFERENCES

    A. ANSI/ASTM A82 - Cold-Drawn Steel Wire for Concrete Reinforcement.

    B. ASTM A123 - Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products.

    C. ASTM A525 - Steel Sheet, Zinc Coated, (Galvanized) by the Hot-Dip Process.

    D. ASTM A615 - Deformed and Plain Billet Steel Bars for Concrete Reinforcement.

    E. ASTM C90 - Hollow Load Bearing Concrete Masonry Units.

    F. ASTM C129 - Non-Load Bearing Concrete Masonry Units.

    G. ASTM C145 - Solid Load Bearing Concrete Masonry Units.

    H. ASTM C744 - Prefaced Concrete and Calcium Silicate Masonry Units.

    I. IMIAC - International Masonry Industry All-Weather Council: Recommended Practices and Guide Specification for Cold Weather Masonry Construction.

    J. UL - Underwriters' Laboratories.

   1.06 SUBMITTALS

    A. Submit product data under provisions of Section 01300.

    B. Submit product data for decorative and prefaced masonry units and fabricated wire reinforcement.

    C. Submit samples under provisions of Section 01300.

    D. Submit two samples of decorative block and prefaced units to illustrate color, texture and extremes of color range.

    E. Submit manufacturer's certificate under provisions of Section 01400 that products meet or exceed specified requirements.

    F. Submit manufacturer's installation instructions under provisions of Section 01300, 01340.

   1.07 QUALIFICATIONS

    A. Installer: Company specializing in performing the work of this Section with minimum 5 years experience.

   1.08 REGULATORY REQUIREMENTS

    A. Conform to UL Assembly No. U-904 for 8-inch units requirements for fire rated concrete masonry construction.

    B. MOCK-UP

    C. Provide mock-up of masonry construction including all items and accessories.

    D. Erect decorative units prefaced units and concrete masonry units in a 4x4 foot panel size, include specified mortar and accessories.

    E. When accepted, mock-up will demonstrate minimum standard for the Work. Mock-up may not remain as part of the Work.

   1.09 PRE-INSTALLATION CONFERENCE

    A. Convene one week minimum prior to commencing work of this Section, under provisions of Section 01039.

   1.10 DELIVERY, STORAGE, AND HANDLING

    A. Deliver products to site under provisions of Section 01600.

    B. Store and protect products under provisions of Section 01600.

    C. Accept glazed, prefaced, and decorative units on site. Inspect for damage.

   1.11 ENVIRONMENTAL REQUIREMENTS

    A. Maintain materials and surrounding air temperature to minimum 50 degrees F prior to, during, and 48 hours after completion of masonry work.

   1.12 SEQUENCING AND SCHEDULING

    A. Coordinate work under provisions of Section 01039.

    B. Coordinate the masonry work with installation of anchors, and door frames.

   PART 2 - PRODUCTS

   2.01 MANUFACTURERS - CONCRETE MASONRY UNITS

    A. Decorative Units.

    Pre-glazed concrete masonry units - Spectra-Glaze II.

   Split face textured concrete masonry units - Browns Concrete & Block Company, Nashville, TN.

   Substitutions: Under provisions of Section 01600.

   2.02 CONCRETE MASONRY UNITS

    A. Hollow Load Bearing Block Units: ASTM C90, Grade N, Type I - Moisture Controlled; normal weight.

    B. Solid Load Bearing Block Units: ASTM C145, Grade N, Type I - Moisture Controlled; normal weight.

    C. Decorative Block Units: ASTM C90, Grade N, Type I - Moisture Controlled; color as selected to the following design:

    Split face textured.

    D. Prefaced Block Units: ASTM C744 with resinous surfacing on ASTM C145 ASTM C90 masonry units, Grade N, Type I - Moisture Controlled; normal weight; color - Deep Bermuda Blue.

   Masonry Units: Nominal modular size of 8 x 16 x 8, 6 and/or 4 inches. Provide special units for 90 degree corners, bond beams, lintels, coved base, and bullnosed corners.

    F. All units not pre-glazed shall be water repellant units manufactured with "dry-block" liquid polymeric admixture by a qualified approved producer. Units with no exterior exposure may be non water repellant block.

   2.03 REINFORCEMENT AND ANCHORAGE

    A. Single Wythe Joint Reinforcement: Truss type; hot dip galvanized after fabrication cold-drawn steel conforming to ANSI/ASTM A82, 3/16 inch side rods with 9 gage cross ties; manufactured by A.A. Wire Products Co., Dur-O-Wall, Inc., or equal.

    B. Multiple Wythe Joint Reinforcement: Truss Ladder type; with moisture drip; hot dip galvanized after fabrication cold-drawn steel conforming to ANSI/ASTM A82, 3/16 inch side rods with 9gage cross ties; manufactured by A.A. Wire Products Co., Dur-O-Wall, Inc., or equal.

    C. Reinforcing Steel: Same type, specified in Section 03200; size, galvanized finish.

    D. Strap Anchors: Bent steel shape, 1 x length required by wall thickness inch size x 1/8 inch thick, galvanized to ASTM A123 finish.

    E. Formed Steel Wire Wall Ties: 9 gage thick, galvanized steel finish.

    F. Dovetail Anchors: Bent steel strap, length required x 1-1/2 inch size x 1/8 inch thick, galvanized to ASTM A123 finish.

   2.04 FLASHINGS

    A. Flashing: Stainless steel, AISI Type 304, 2D finish, fully annealed or dead soft temper, 0.012 inch thick, lead or terne coated both faces; Keystone Flashing co., Architectural Steel Corp., or equal. Concealed flashing shall be fabricated to impart a 3-way bond with the mortar.

   2.05 ACCESSORIES

   Preformed Control Joints: Rubber or Polyvinylchloride material. Provide with corner and tee accessories.

   Joint Filler: Closed cell polyethylene; or rubber; oversized 50 percent to joint width; self-expanding; maximum lengths; width to suit joint.

    Building Paper: #30 asphalt saturated felt.

   Nailing Strips: Softwood, preservative treated for moisture resistance, dovetail shape, sized to masonry joints.

   Weep Holes: clear-open head joints.

   Cavity Vents: Molded polyvinylchloride grilles; insect proof.

   Cleaning Solutions: Non-acidic, not harmful to masonry work or adjacent materials.

   PART 3 - EXECUTION

   3.01 EXAMINATION

    A. Verify that field conditions are acceptable and are ready to receive work.

    B. Verify items provided by other Sections of work are properly sized and located.

    C. Verify that built-in items are in proper location, and ready for roughing into masonry work.

    D. Beginning of installation means installer accepts existing conditions.

   3.02 PREPARATION

    A. Direct and coordinate placement of metal anchors supplied to other Sections.

    B. Provide temporary bracing during installation of masonry work. Maintain in place until building structure provides permanent bracing.

   3.03 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. Lay concrete masonry units in running bond. Course one unit and one mortar joint to equal 8 inches. Form concave mortar joints.

    D. Lay decorative, pre-glazed and glass units to coursing of one unit and one mortar joint to equal 8 inches. Form concave mortar joints.

   3.04 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 are not permitted.

    D. Remove excess mortar 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 jobsite cutting of masonry units with proper tools to provide straight, clean, unchipped edges. Prevent broken masonry unit corners or edges.

    H. Cut mortar joints flush where bitumen damp-proofing is applied.

    I. Isolate masonry partitions from vertical structural framing members with a control joint.

    J. Isolate top joint of masonry partitions from horizontal structural framing members and slabs or decks with compressible joint filler.

   3.05 WEEPS AND VENTS

    A. Install weep holes in veneer at 32 inches on center horizontally above through-wall flashing, above shelf angles and at bottom of walls.

   3.06 CAVITY WALL

    A. Do not permit mortar to drop or accumulate into cavity air space or to plug weep holes.

    B. Build inner wythe ahead of outer wythe to receive cavity insulation air/vapor barrier adhesive.

   3.07 REINFORCEMENT AND ANCHORAGES - SINGLE WYTHE MASONRY

    A. Install horizontal joint reinforcement 16 inches oc.

    B. Place masonry joint reinforcement in first and second horizontal joints above and below openings. Extend minimum 16 inches each side of opening.

    C. Place joint reinforcement continuous in first and second joint below top of walls.

    D. Lap joint reinforcement ends minimum 6 inches. Extend minimum 16 inches each side of openings.

    E. Imbed anchors attached to structural steel members in every second block joint.

   3.08 REINFORCEMENT AND ANCHORAGES - CAVITY WALL MASONRY

    A. Install horizontal joint reinforcement 16 inches oc.

    B. Place masonry joint reinforcement in first and second horizontal joints above and below openings. Extend minimum 16 inches each side of opening.

    C. Place joint reinforcement continuous in first and second joint below top of walls.

    D. Lap joint reinforcement ends minimum 6 inches. Extend minimum 16 inches each side of openings.

    E. Embed anchors embedded in concrete and/or attached to structural steel members. Embed anchorages in every second block joint.

   3.09 REINFORCEMENT AND ANCHORAGES - REINFORCED UNIT MASONRY

    A. Install horizontal joint reinforcement 16 inches oc.

    B. Place masonry joint reinforcement in first and second horizontal joints above and below openings. Extend minimum 16 inches each side of opening.

    C. Place joint reinforcement continuous in first and second joint below top of walls.

    D. Lap joint reinforcement ends minimum 6 inches. Extend minimum 16 inches each side of openings.

    E. Support and secure reinforcing bars from displacement. Maintain position within 1/2 inch of dimensioned position.

    F. Embed anchors embedded in concrete and/or attached to structural steel members. Embed anchorages in every second block joint.

   3.10 MASONRY FLASHINGS

    A. Extend flashings under and/or through veneer, turn up minimum 8 inches and bed into mortar joint of masonry and/or seal to concrete back-up.

    B. Lap end joints minimum 6 inches and seal watertight.

    C. Use flashing manufacturer's recommended adhesive and sealer.

   3.11 LINTELS

    A. Install loose steel lintels over window openings, door openings, and louvers.

    B. Maintain minimum 8 inch bearing on each side of opening.

   3.12 GROUTED COMPONENTS

    A. Reinforce bond beam with 2, No. 5 bars, placed continuous.

    B. Reinforce pilaster with 2, No. 4 bars.

    C. Lap splices minimum 40 bar diameters.

    D. Support and secure reinforcing bars from displacement. Maintain position within 1/2 inch of dimensioned position.

    E. Place and consolidate grout fill without displacing reinforcing.

    F. At bearing locations, fill masonry cores with grout for a minimum 16 inches either side of opening.

   3.13 ENGINEERED MASONRY

    A. Lay masonry units with core cells vertically aligned and cavities between wythes clear of mortar and unobstructed.

    B. Place mortar in masonry unit bed joints back 1/4 inch from edge of unit grout spaces, bevel back and upward. Permit mortar to cure days before placing grout.

    C. Reinforce masonry unit cores with reinforcement bars and grout as indicated.

    D. Retain vertical reinforcement in position at top and bottom of cells and at intervals not exceeding 192 bar diameters. Splice reinforcement in accordance with Section 03200.

    E. Wet masonry unit surfaces in contact with grout just prior to grout placement.

    F. Grout spaces less than 2 inches in width with fine grout using low lift grouting techniques. Grout spaces 2 inches (50 mm) or greater in width with course grout using high or low lift grouting techniques.

    G. When grouting is stopped for more than one hour, terminate grout 1-1/2 inch below top of upper masonry unit to form a positive key for subsequent grout placement.

    H. Low Lift Grouting: Place first lift of grout to a height of 16 inches and rod for grout consolidation. Place subsequent lifts in 8 inch increments and rod for grout consolidation.

    I. High Lift Grouting:

   Provide cleanout opening no less than 4 inches high at the bottom of each cell to be grouted by cutting one face shell of masonry unit.

   In double wythe walls, omit every second masonry unit in one of the wythes for clean out and cell inspection purposes.

   In double wythe walls, construct vertical grout barriers or dams between the masonry wythes, with masonry units every 30 feet maximum.

   Clean out masonry cells with high pressure water spray. Permit complete water drainage.

   Request the Architect/Engineer to inspect the cells. Allow 3 days advance notice of inspection.

   After cleaning and cell inspection, seal openings with masonry units.

   Pump grout into spaces. Maintain water content in grout to intended slump without aggregate segregation.

   Limit grout lift to 48 inches and rod for grout consolidation. Wait 30 to 60 minutes before placing next lift.

   3.14 CONTROL AND EXPANSION JOINTS

    A. Do not continue horizontal joint reinforcement through control [and expansion] joints.

   Install preformed control joint device in continuous lengths. Seal butt and corner joints in accordance with manufacturer's instructions.

   Size control joint in accordance with Section 07900 for sealant performance.

    Form expansion joint as detailed.

   3.15 BUILT-IN WORK

    A. As work progresses, build in metal door, and glazed frames, fabricated metal frames, window frames, wood nailing strips, anchor bolts, plates, and other items furnished by other Sections.

    B. Build in items plumb and level.

    C. Bed anchors of metal door and glazed frames in adjacent mortar joints. Fill frame voids solid with grout. Fill adjacent masonry cores with grout minimum 12 inches from framed openings.

    D. Do not build in organic materials subject to deterioration.

   3.16 TOLERANCES

    A. Maximum Variation From Alignment of Columns: Pilasters: 1/4 inch.

    B. Maximum Variation From Unit to Adjacent Unit: 1/32 inch.

    C. Maximum Variation From Plane of Wall: 1/4 inch in 10 feet and 1/2 inch in 20 feet or more.

    D. Maximum Variation From Plumb: 1/4 inch per story non-cumulative; 1/2 inch in two stories or more.

   Maximum Variation From Level Coursing: 1/8 inch in 3 feet and 1/4 inch in 10 feet; 1/2 inch in 30 feet.

   Maximum Variation of Joint Thickness: 1/8 inch in 3 feet.

   Maximum Variation From Cross Sectional Thickness of Walls: 1/4 inch .

    CUTTING AND FITTING

   Cut and fit for chases, pipes, conduit, sleeves, and grounds. Coordinate with other Sections of work to provide correct size, shape, and location.

   Obtain Architect/Engineer approval prior to cutting or fitting masonry work not indicated or where appearance or strength of masonry work may be impaired.

    CLEANING

   Clean work under provisions of Section 01700. Clean as many times as required to achieve surface acceptable to the Engineer.

    Remove excess mortar and mortar smears.

    Replace defective mortar. Match adjacent work.

    Clean soiled surfaces with cleaning solution.

    Use non-metallic tools in cleaning operations.

    PROTECTION OF FINISHED WORK

   Protect finished installation under provisions of Section 01500.

   Without damaging completed work, provide protective boards at exposed external corners which may be damaged by construction activities.

    END OF SECTION