1.02 STANDARD REFERENCES: The following standard specifications shall apply to the Work of this Section as indicated:

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1 SECTION CONCRETE UNIT MASONRY PART 1 - GENERAL 1.01 SCOPE: A. The CONTRACTOR shall furnish all labor, materials and equipment necessary for the masonry construction as shown on the drawings or as specified herein. B. Related work specified elsewhere: 1. SECTION Reinforced Unit Masonry 1.02 STANDARD REFERENCES: The following standard specifications shall apply to the Work of this Section as indicated: A. American Society of Testing Materials (ASTM) 1.03 SUBMITTALS: A. Submit properly identified manufacturer's product data on each type of metal anchor and accessory. B. Submit properly identified samples of each type of accessory ENVIRONMENTAL CONDITIONS: 1. Temperature: A minimum of 40 degrees F. and rising. 2. Weather: No precipitation during application WARRANTY: A. The MANUFACTURER shall warrant the EQUIPMENT, MATERIALS and PRODUCTS specified in this section against defective materials and workmanship with the MANUFACTURER S standard warranty, but for no less than one year from the date of Substantial Completion, and as described in Article 13 of Section General Terms and Conditions. B. The CONTRACTOR shall warrant the WORK against defects for one year from the date of Substantial Completion and as described in Article 13 of Section General Terms and Conditions. PART 2 - MATERIALS 2.01 LOAD BEARING CONCRETE UNIT MASONRY: A. Weight: Normal B. Size and Type: 8 inch by 16 inch by thickness indicated. Provide 4-inch thick solid exterior masonry veneer units for cavity walls. All other masonry shall be two-cell stretcher type. C. Texture: Medium D. Grade: ASTM C90, Grade N-1, amended to allow a maximum moisture content of 50 percent total absorption. E. Unit Linear Shrinkage: 0.03 percent, ASTM C426. F. Shapes: Appropriate to suit conditions. Provide U block units where indicated. Spec. Standard: 08/31/ Revision: 09/02/11

2 2.02 NON-LOAD BEARING CONCRETE UNIT MASONRY: A. Weight: Normal B. Size and Type: 8 inch by 16 inch by thickness indicated; two-cell flush end type. C. Texture: Medium D. Grade: ASTM C129, Type I, amended to allow a maximum moisture content of 50 percent total absorption. E. Unit Linear Shrinkage: 0.03 percent, ASTM C426. F. Shapes: Appropriate to suit conditions including partition top closures PRECAST CONCRETE LINTELS: Precast concrete lintels shall be factory-made units from a plant regularly engaged in producing concrete items. Unless otherwise indicated, concrete shall be Class A conforming to SECTION Cast-In-Place Concrete, using 1/2 inch to No. 4 nominal size coarse aggregate, reinforced with not less than two No. 4 bars. Lintels shall be reinforced for full lintel length. Splices in lintels, if required, shall be 24 bar diameters or 12 inches, whichever is greater. For lintels, minimum clearance of 3/4 inch shall be maintained between reinforcement and interior faces of units. Top of lintels shall be labeled "top" or otherwise identified. Lintel reinforcement, where not indicated, shall be as specified in the following table REINFORCEMENT OF LINTELS: Nominal Nominal Width Height Reinforcement 4 inches or 6 inches 8 inches One No. 4 Bar top and bottom, centered horizontally. 8 inches 8 inches Two No.6 bars at bottom, and two No. 6 bar at top CONCRETE BRICK: A. Grade: ASTM C55, Grade N-1, amended to allow a maximum moisture content of 50 percent total absorption. B. Size: Appropriate to suit conditions MORTAR: A. Portland Cement: ASTM C150 Type I, domestic B. Masonry Cement: ASTM C91, domestic C. Sand: ASTM C144 D. Water: Potable E. Mortar Mix: ASTM C270, Type S (1800 psi) above grade use, and Type M (2500 psi) below grade use. Mix accurately in following proportions by volume: Type S Type M 1 part masonry cement 1 part masonry cement 1/2 part Portland Cement 1 part Portland Cement 4 parts sand 4-1/2 parts sand Spec. Standard: 08/31/ Revision: 09/02/11

3 2.07 MORTAR FOR PARGING MASONRY WALLS: Mix in same proportions as for Type S mortar specified above REINFORCEMENT, ANCHORS, TIES, AND ACCESSORIES: A. Standard Horizontal Joint Reinforcement: Two continuous 9 gauge longitudinal wires and 9 gauge truss wire design for unreinforced masonry wall and 9 gauge ladder design for reinforced masonry wall, deformed steel, all hot dip galvanized, including preformed welded corners in accordance with ASTM A82. Widths to suit thickness of block to within one inch of each face. 1. Acceptable Manufacturers: Dur-O-Wal "Single Wythe Truss" Dur-O-Wal "Single Wythe Ladur" A.A. Wire Products Company "Blok-Truss" Hohmann & Barnard, Inc. "Trus-Mesh" Jim Taylor, Inc. "Regular Truss Ty" B. Cavity Wall Joint Reinforcement: Three continuous 9 gauge longitudinal wires and 9 gauge trussed wire design of deformed steel, all hot dip galvanized, including preformed welded corners in accordance with ASTM A82. Width of two inner wires to suit thickness of 8-inch inner block wythe to within 1 inch of veneer face. 1. Acceptable Manufacturers: Dur-O-Wal "Truss Trirod" A.A. Wire Products "3 WireBlok Trus" Hohmann & Barnard, Inc. "Tri-Truss-Mesh-Lock" Jim Taylor, Inc. "Ty-Wal 3 Wire" C. Vertical Reinforcing Bars: ASTM A615, Grade 60, deformed D. Dovetail Slots: 22 gauge galvanized with filler, 1 inch wide by 1 inch deep E. Dovetail Anchors: 16 gauge corrugated galvanized steel, 1 inch wide by 5-1/2 inches long, sized to fit dovetail slots PART 3 - EXECUTION 3.01 LAYING UNITS: Lay masonry plumb, true to line, with level and accurately spaced courses. Keep bond plumb throughout. Lay corners and reveals plumb and true. Where adjustment must be made after mortar has started to harden, remove mortar and replace with fresh mortar. Use concrete brick to course out walls concealed in the finished work. Cut masonry units dry. Utilize masonry saws for cuts exposed in the finished work TOLERANCES: Plumb masonry work within tolerance of 1/8 inch in 5 feet. Level courses within tolerances of 1/4 inch in length of any run BOND: Provide common bond, with vertical joints centered over masonry unit below. Bond masonry at corners and intersections JOINT TREATMENT: A. Block Exposed to View: Strike joints flush, apply cement-sand slurry with mason's brush then float finish joints smooth and flush with block and with mortar thoroughly compacted and pressed against edges of units. B. Concealed Block: Joints struck flush. C. Joint Thickness: 3/8 inch. Spec. Standard: 08/31/ Revision: 09/02/11

4 3.05 JOINTING METHODS: Where concrete block cores are indicated to be filled with concrete, lay block in full mortar beds and full mortar end joints. Lay all other concrete block with full beds of mortar on vertical and horizontal face shells. Furrowing of mortar not permitted. Shove vertical joints tight. Uniformly rake joints between masonry and door frames to 3/8-inch depth to receive caulking or sealant. Rake joints around flush electrical outlets in wet locations to receive caulking or sealant MORTAR FILLED UNITS: A. First cell of blocks abutting jambs of door and window frames B. Cells of blocks at free ends of partitions and walls C. Where necessary for embedment of anchors, and where otherwise shown. D. Voids around ducts, pipes and other items passing through masonry work E. Hollow metal door frames and masonry walls; grout solid with mortar as masonry is laid. Include tops of door frames LOAD BEARING MASONRY WALLS: Erect masonry prior to reinforced concrete building frame. Close masonry top course cores under poured concrete beams with paper stuffing or metal caps. Do not use flush end type units against columns or poured concrete walls CONCRETE FILL FOR MASONRY CORES: Coordinate masonry work to allow placing of pea rock concrete as indicated and as specified in Concrete section. Fill top courses of concrete masonry walls with concrete prior to placing or use concrete brick for top courses to assure solid masonry SETTING OF ITEMS FURNISHED UNDER OTHER SECTIONS: Set anchors, bolts, sleeves, access panels, door frames and other items occurring in masonry as the work progresses SECURING HOLLOW METAL DOOR FRAMES: Set in hollow metal frames on floor, floor clips secured and frames braced in proper position. Grout anchors into masonry joints as walls are laid up LINTELS: Set reinforced precast concrete or coordinate installation of poured in place concrete lintels as indicated. Precast concrete lintels to be set in full mortar beds with 8 inches minimum bearing each end INSTALLATION OF HORIZONTAL WALL JOINT REINFORCEMENT: Provide as specified herein: A. Provide standard horizontal joint reinforcing in every second block course joint and at first joint above and below openings for exterior and interior masonry. B. Cut corners and intersections as recommended by manufacturer. Extend reinforcement 6 inches into concrete tie columns and concrete encasement of steel columns poured after block is in place. Unless walls have poured concrete corner tie columns, make wall and partition joint reinforcing continuous around corners and at intersections in accordance with manufacturer s published directions. Lap splices in joint reinforcement no less than 6 inches. Reinforcement shall not be continuous through expansion joints. END OF SECTION Spec. Standard: 08/31/ Revision: 09/02/11

5 SECTION REINFORCED UNIT MASONRY PART 1 - GENERAL 1.01 SCOPE: The Work of this Section shall consist of furnishing all labor, material, and equipment necessary for installation of reinforced unit masonry as shown on the Drawings and specified herein SUBMITTALS: A. Mill Certificates, Reinforced Unit Masonry: For information only, submit 2 copies of steel producer's certificates of mill tests for all reinforced steel. B. Shop Drawings, Reinforced Unit Masonry: Submit shop Drawings for fabrication, bending, and placement or reinforcing bars. Comply with ACI 315 "Manual of Standard Practice for Detailing Reinforced Concrete Structures". Show bar schedules, diagrams of bent bars, stirrup spacing, lateral ties and other arrangements and assemblies as required for fabrication and placement of reinforcing for unit masonry work DELIVERY, STORAGE, HANDLING: A. Deliver reinforcing to the site, bundled, tagged and marked. Use metal tags indicating size, lengths and other markings shown on placement drawings (if any). B. Store materials off the ground, and keep covered for protection from straining and damage WARRANTY: A. The MANUFACTURER shall warrant the EQUIPMENT, MATERIALS and PRODUCTS specified in this section against defective materials and workmanship with the MANUFACTURER S standard warranty, but for no less than one year from the date of Substantial Completion, and as described in Article 13 of Section General Terms and Conditions. B. The CONTRACTOR shall warrant the WORK against defects for one year from the date of Substantial Completion and as described in Article 13 of Section General Terms and Conditions. PART 2 - PRODUCTS 2.01 MATERIALS: A. Concrete Masonry Units (CMU): Size and type shown, and as specified under SECTION Concrete Unit Masonry. B. Reinforcing Bars: ASTM A 615, as follows: 1. Provide Grade 60 for all bars. 2. Shop-fabricate reinforcing bars that are shown to be bent or hooked. 3. Ladder type horizontal reinforcement, Dur-O-Wal "Single Wythe Ladur". C. Grout Materials: Grout material for vertical and horizontal reinforced masonry applications shall conform to the requirements of ASTM C476. Spec. Standard: 08/31/ Revision: 09/02/11

6 PART 3 - EXECUTION 3.01 PLACING REINFORCING: A. General: Clean free of loose rust, mill scale, earth, or other materials that will reduce bond to mortar or grout. Do not use reinforcing bars with kinks or bends not shown on Drawings, final shop drawings, or bars with reduced cross-section due to excessive rusting or other causes. B. Position reinforcing accurately at the spacing shown. Support and secure vertical bars against displacement. Horizontal reinforcing 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 inch (whichever is greater). 1. For columns, piers, pilasters, provide a clear distance between vertical bars as shown, but not less than 1-1/2 times the nominal bar diameter or 1-1/2 inches, whichever is greater. Provide lateral ties as shown. C. Splice reinforcing bars where shown; do not splice at other points unless acceptable to the DISTRICT. Provide lapped splices, unless otherwise shown. In splicing vertical bars or attaching to dowels, lap ends, place in contact and wire tie. 1. Provide not less than minimum lap shown, or if not shown, as required by governing code. D. Anchoring: Anchor reinforced masonry work to supporting structure as shown INSTALLATION, GENERAL: A. Layout walls in advance for accurate spacing of exposed bond patterns with uniform joint widths, and to properly locate openings, movement-type joints, returns and offsets. Avoid the use of less-than-halfsize units at corners, lambs and wherever possible at other locations. B. Lay-up walls plumb and true with courses level, accurately spaced and coordinated with other work. C. Cut joints flush. Rake out mortar wherever joints are to receive caulking or sealing. D. Remove masonry units disturbed after laying; clean and relay in fresh mortar. Do not pound corners at jambs to fit stretcher units that have been set in position. If adjustments are required, remove masonry units, clean off mortar, and reset in fresh mortar. E. Stop masonry work by racking back 1/2 masonry unit length in each course; do not tooth. Stop group pours 4 inches back of rack at ends and as further specified at top of pours. Prior to resuming masonry work, remove loose units and unbonded mortar, clean exposed surfaces of set masonry and, if specified to be wetted, wet units lightly. F. Build-in items specified under this and other sections of these specifications as the work progresses. Fill-in solidly with masonry around build-in items. G. Install concealed flashings for reinforced masonry work as shown, and as specified under SECTION Concrete Unit Masonry. H. Install movement type joints (expansion, control and isolation) as shown and as specified under SECTION Concrete Unit Masonry INSTALLATION OF REINFORCED CONCRETE UNIT MASONRY WORK: A. General: Do not wet concrete masonry units. Lay units with full-face shell mortar beds. Fill vertical head joints (end joints between units) solidly with mortar from face of unit to a distance behind face equal to not less than the thickness of longitudinal face shells. Solidly bed cross-webs of starting courses in mortar. Maintain head and bed joint widths shown, or if not shown, provide 3/8 inch joints. Spec. Standard: 08/31/ Revision: 09/02/11

7 B. Walls: 1. Pattern Bond: Lay wall units in 1/2 running bond with vertical joints in each course centered on units in courses above and below, unless otherwise shown. Bond and interlock each course at corners and intersections. Use special-shaped units where shown, and as required for corners, jambs, sash, control joints, lintels, bond beams and other special conditions. 2. Maintain vertical continuity of core or cell cavities, which are to be reinforced and grouted, to provide minimum clear dimensions shown and to provide minimum clearance and grout coverage for vertical reinforcing bars. Keep cavities free of mortar. Solidly bed webs in mortar where adjacent to reinforced cores or cells. 3. Where horizontal reinforced beams (bond beams) are shown, use special units or modify regular units to allow for placement of continuous horizontal reinforcing 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. C. Columns, Piers, and Pilasters: Use units of the size, shape and number of vertical core spaces shown. If not shown, use units which provide minimum clearances and grout coverage for number and size of vertical reinforcing bars shown. D. Provide pattern bond shown, or if not shown, alternate head joints in vertical alignment. E. Where bonded pilaster construction is shown, lay wall and pilaster units together to maximum pour height specified. F. Grouting: 1. Grouting Technique: At the CONTRACTOR's option, use either low-lift or high-lift grouting techniques subject to the requirements that follow: 2. Low-Lift Grouting: Place vertical reinforcing prior to laying outside diameter CMU. Extend above elevation of maximum pour height as required to allow for splicing. Support in position at vertical intervals not exceeding 160 bar diameters. 3. Lay to maximum pour height. Do not exceed 4 feet height or if bond beam occurs below 4 feet height, stop pour at course below bond beam. 4. Pour grout using container with spout or by chute. Rod or vibrate grout during placing. Place grout continuously. Do not interrupt pouring of grout for more than one hour. Terminate grout pours 1-1/2 inches below top course of pour. 5. Bond Beams: Stop grout in vertical cells 1-1/2 inches below bond beam course. Place horizontal reinforcing in bond beams; lap at corners and intersections as shown. Place grout in bond beam courses before filling vertical cores above bond beam. G. High-Lift Grouting: Do not use high-lift grouting technique for grouting unless minimum cavity dimension is 3 inches or larger. 1. Provide clean out holes in first course at all vertical cells which are to be filled with grout. a. Use units with one face shell removed and provide temporary supports for units above, or use header units with concrete brick supports, or cut openings in one face shell. 2. Construct masonry to full height of maximum grout pour specified, prior to placing grout. a. Limit grouting pours to heights recommended by the National Concrete Masonry Association (NCMA) for the type of units, reinforcing and grout used in the work, but in no case exceed 10 feet height. 3. Place vertical reinforcing before grouting. Place before or after laying masonry units, as required by job conditions. Tie vertical reinforcing to dowels at base of masonry where shown Spec. Standard: 08/31/ Revision: 09/02/11

8 and thread over or around reinforcing. Support vertical reinforcing at intervals not exceeding 160 bars diameter. 4. Place horizontal beam reinforcing as the masonry units are laid. 5. Preparation of Grout Spaces: Prior to grouting, inspect and clean grout spaces. Remove dust, dirt, mortar droppings, loose pieces of masonry and other foreign materials from grout spaces. Clean reinforcing and adjust to proper position. Clean top surface of structural members supporting masonry to insure bond. After final cleaning and inspection, close clean out holes and brace closures to resist grout pressure. 6. Do not place grout until entire height of masonry to be grouted has attained sufficient strength to resist displacement of masonry units and breaking of mortar bond. Install shores and bracing, if required, before starting grouting operations. 7. Place grout by pumping into grout spaces unless alternate methods are acceptable to the DISTRICT. 8. Limit grout pours to sections which can be completed in one working day with not more than one hour interruption of pouring operation. Place grout in lifts that do not exceed 4 feet. Allow not less than 30 minutes, or more than one hour between lifts of a given pour. Rod or vibrate each grout lift during pouring operation. a. Place grout in lintels or beams over openings in one continuous pour. 9. Where bond beam occurs more than one course below top of pour, fill bond beam course to within 1 inch of vertically reinforced cavities, during construction of masonry. 10. When more than one pour is required to complete a given section of masonry, extend reinforcing beyond masonry as required for splicing. Pour grout to within 1-1/2 inches of top course of first pour. After grouted masonry is cured, lay masonry units and place reinforcing for second pour section grouting. Repeat sequence if more pours are required. END OF SECTION Spec. Standard: 08/31/ Revision: 09/02/11

A. Coordinate concrete unit masonry (also termed CMU and block ) work with work before and after, especially:

A. Coordinate concrete unit masonry (also termed CMU and block ) work with work before and after, especially: 04222 CONCRETE UNIT MASONRY (UNREINFORCED ONLY) SPECIFIER: Use this section only for UNREINFORCED concrete masonry. Its only reinforcement is in the horizontal joints. It covers ONLY plain blockwork (no