SECTION UNIT MASONRY ASSEMBLIES

SECTION 04810 UNIT MASONRY ASSEMBLIES PART 1 GENERAL 1.01 SUMMARY A. Section Includes: 1. Concrete Block. 2. Clay Facing Brick. 3. Reinforcement and Anchorage. 4. Flashings. 5. Accessories. B. Related Sections: 1. Section 04065 - Mortar and Masonry Grout. 2. Not Used 3. Section 04720 - Architectural Cast Stone. 4. Section 05500 - Metal Fabrications: Loose steel lintels. 5. Section 07115 - Bituminous Dampproofing: Dampproofing masonry surfaces. 6. Section 07900 - Joint Sealers: Backing rod and sealant at control and expansion joints. 1.02 REFERENCES A. Reference Standards: See Section 01400. Comply with following: 1. ACI 530/ASCE 5/TMS 402 - Building Code Requirements for Masonry Structures; American Concrete Institute International. 2. ACI 530.1/ASCE 6/TMS 602 - Specification For Masonry Structures; American Concrete Institute International. 3. ASTM A 82 - Standard Specification for Steel Wire, Plain, for Concrete Reinforcement. 4. ASTM A 153/A 153M - Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware. 5. ASTM C 90 - Standard Specification for Load bearing Concrete Masonry Units. 6. ASTM C 140 - Standard Test Methods of Sampling and Testing Concrete Masonry Units and Related Units. 7. ASTM C 216 - Standard Specification for Facing Brick (Solid Masonry Units Made From Clay or Shale). 8. ASTM C 780 - Standard Test Method for Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit Masonry. 9. BIA Technical Notes No. 10A Rev - Design and Detailing of Movement Joints, Part II of II. 10. IMIAWC (CW) - Recommended Practices & Guide Specifications for Cold Weather Masonry Construction; International Masonry Industry All-Weather Council. 11. IMIAWC (HW) - Recommended Practices & Guide Specifications for Hot Weather Masonry Construction; International Masonry Industry All-Weather Council; current edition. 12. NCMA TEK 10-2A - Control Joints for Concrete Masonry Walls. 1.03 SUBMITTALS A. See Section 01300 - Administrative Requirements, for submittal procedures. 1. Product Data: Provide data for masonry units, fabricated wire reinforcement, and flashing. 2. Samples: Submit four samples of facing brick units to illustrate color, texture, and extremes of color range. 3. Manufacturer's Certificate: If requested by Architect, submit certification that masonry units meet or exceed specified requirements. UNIT MASONRY ASSEMBLIES 04810-1

1.04 QUALITY ASSURANCE A. Comply with provisions of ACI 530/ASCE 5/TMS 402 and ACI 530.1/ASCE 6/TMS 602, except where exceeded by requirements of the contract documents. B. Fire Rated Assemblies: Conform to applicable code for UL assemblies indicated on the drawings. 1.05 MOCK-UP A. Construct a masonry wall as a mock-up panel sized 8 feet long by 6 feet high, which includes mortar and accessories, structural backup, flashings, wall insulation, and dampproofing/vapor barrier. 1. Schedule mock-up panel sufficiently in advance of scheduled beginning of masonry operations to allow time for mortar to cure and cleaning to be completed before observation by Architect, and for additional mockups to be completed should initial mockup be rejected. 2. Locate where directed by Architect. 3. Mock-up may not remain as part of the Work. 1.06 PRE-INSTALLATION MEETING A. Convene one week before starting work of this section. 1. Review field conditions with Contractor and confirm that work of other trades is correctly prepared for masonry to begin. 2. Review layout of control joints with Architect. 3. Select location of mock-up panel. 1.07 DELIVERY, STORAGE, AND HANDLING A. Deliver, handle, and store masonry units by means that will prevent mechanical damage and contamination by other materials. 1. Schedule delivery of masonry materials sufficiently in advance of use to allow time for drying, tempering and protection. 1.08 ENVIRONMENTAL REQUIREMENTS A. Preparation: Before beginning work, remove ice or snow formed on masonry bed by carefully applying heat until top surface is dry to touch. Remove frozen or damaged masonry. B. Cold Weather Requirements: Comply with recommendations of IMIAWC (CW). 1. Frozen Work: Above paragraph is intended to permit masonry work to continue during periods of cold temperature. Any frozen masonry work will be prima facie evidence that above requirements have not been complied with. Remove and replace frozen materials as directed by Architect. C. Hot Weather Requirements: Comply with IMIAWC (HW). 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 corners, lintels, headers, control joint edges, ends, and other detailed conditions or as required to complete the project. 3. At exterior locations, provide Grade N, normal weight. 4. Load-Bearing Units: ASTM C 90. a. Both hollow and solid block, as indicated. UNIT MASONRY ASSEMBLIES 04810-2

2.02 BRICK UNITS b. Type I - Moisture-controlled; lightweight except as otherwise indicated. c. Exposed faces: Manufacturer's standard color and texture. A. Facing Brick: ASTM C 216, Type FBS, Grade SW. 1. Provide brick as required by Owner. 2. Color and texture to match Architect's sample. 3. Actual size: 3-5/8 X 7-5/8 inches. Height as required by Coursing Article in Part 3 of this Section. 4. Special shapes: Provide 100 percent solid units at corbels, at top course of exterior piers and walls, window sills, at soldier courses in bearing walls, and wherever cores of hollow units would be exposed to view or weather. 5. Efflorescence: Rated Not Effloresced, ASTM C67. 6. Freezing and Thawing: Pass freezing and thawing test, ASTM C67. 2.03 MORTAR AND GROUT MATERIALS A. Mortar and grout: As specified in Section 04065. 2.04 REINFORCEMENT AND ANCHORAGE A. Manufactured Joint Reinforcement and Related Accessories: Provide products by following manufacturers: 1. Dur-O-Wal, Inc. 2. Hohmann & Barnard, Inc. B. Single Wythe Joint Reinforcement at Non-reinforced Walls: Truss type; ASTM A 82 steel wire, hot dip galvanized after fabrication to ASTM A 153/A 153M, Class B; 0.1483 inch (3.8 mm) side rods with 0.1483 inch (3.8 mm) cross rods; width as required to provide not more than 1 inch (25 mm) and not less than 1/2 inch (13 mm) of mortar coverage on each exposure. C. Multiple Wythe Joint Reinforcement: Ladder type; fabricated with moisture drip; adjustable; ASTM A 82 steel wire, hot dip galvanized after fabrication to ASTM A 153/153M, Class B; 0.1483 inch (3.8 mm) side rods with 0.1483 inch (3.8 mm) cross rods; width as required to provide not more than 1 inch (25 mm) and not less than 1/2 inch (13 mm) of mortar coverage on each exposure. 1. Reinforced Walls: Dur-O-Wal D/A 360 Ladur-Eye. 2. Other Walls: Dur-O-Wal D/A 370 Dur-O-Eye. 3. Exterior Walls: Hot dipped galvanized, ASTM, Class B2, (1.5 ounces per SQ FT). 4. Interior Walls: Mill galvanized, ASTM A641, Class 1, (0.4 ounces per SQ FT). D. Anchors at new concrete frame: Hohmann & Barnard No. 315 ties and 305 dovetail slots installed under Section 03300: 1. Provide dovetail slot and tie by same manufacturer. 2. Wire ties: trapezoidal shape, 0.1875 inch (4.75 mm) thick. Provide size as required to provide minimum of 2 inch (50 mm) embedment in mortar joint. 3. Finish: Hot dip galvanized after fabrication, ASTM A153, Class B. E. Masonry Veneer Anchors: Comply with ACI 530: 2-piece anchors that permit differential movement between masonry veneer and structural backup, hot dip galvanized to ASTM A 153/A 153M, Class B-2. 1. Wall Ties: Hohmann & Barnard DW-10, two screw anchor plate with wire ties. a. Provide size as required to provide minimum of 2 inch embedment in mortar joint. 2. Screws: Hohmann & Barnard co-polymer coated self-tapping, self-drilling No. 8 by length required to penetrate metal stud by 1/2 inch. 3. Wire ties: trapezoidal shape, 0.1875 inch (4.75 mm) thick. Provide size as required to provide minimum of 2 inch (50 mm) embedment in mortar joint. UNIT MASONRY ASSEMBLIES 04810-3

4. Maximum Clearance between Connecting Parts of Ties (Maximum Side to Side Play): 1/16 inch (1.5 mm). 5. Vertical adjustment: Not less than 2 inches (50 mm). F. Substitutions: See Section 01600 - Product Requirements. 2.05 FLASHINGS A. Elastomeric Thermoplastic Flashing: Manufacturer's standard composite flashing product consisting of a polyester reinforced ethylene interpolymer alloy. 1. Product 0.025 inch (0.6 mm) thick with a 0.015 inch (0.4 mm) thick layer of rubberized asphalt adhesive. a. Where extended beyond the face of the wall, omit the rubberized asphalt for 3/4 inch (19 mm) at the outer edge to allow for sealant adhesion. b. Provide flashing as a complete system with preformed corners, end dams, other special shapes, and seaming materials; all produced by flashing sheet manufacturer. c. Color: As selected by Architect to approximate mortar color 2. Manufacturers: a. Hyload Flashing Membrane; Hyload Cloaked Flashing System. b. Substitutions: See Section 01600 - Product Requirements. 2.06 ACCESSORIES A. Compressible Filler: ASTM D1056, Class RE41, Neoprene material, closed cell, minimum 50 percent compressibility, with adhesive on one side. Provide with corner and tee accessories, fused joints. 1. Size: 3/8 inch (9.5 mm) thick by full depth of veneer. 2. Joint Sealers and Backing Material: Section 07900. B. Cavity Drainage Material: Product designed to maintain a clear path for moisture in cavity to drain by preventing mortar droppings in cavity from damming and from blocking weep holes. 1. Product: High Density polyethylene or nylon strands with no negative reaction to PVC, Polyethylene, polystyrenes, copper, lead, rubberized asphalt, or stainless steel. 2. Shape and Size: 90 percent open free-draining mesh, 2 inch (25 mm) thick by 10 inches (254 mm) high in trapezoidal configuration with dovetail shape at top to avoid being clogged by mortar droppings. 3. Net: Not absorb or trap moisture, not support mold or fungus, and inedible by insects. Will not degrade as a result of temperature variations. 4. Manufacturers: a. Hohmann & Barnard, Inc. b. Substitutions: See Section 01600 - Product Requirements. C. Weeps: open head joints, min. 2-inches high, at every third brick. D. Cleaning Solution: Non-acidic, not harmful to masonry work or adjacent materials, and recommended by manufacturer of masonry units for use on their product. PART 3 EXECUTION 3.01 EXAMINATION A. Verify that field conditions are acceptable and are ready to receive masonry. 1. Inspect foundations and other bearing surfaces for proper grades and elevations, freedom from dirt and other foreign material. 2. Verify that related items provided under other sections are properly sized and located. 3. Verify that built-in items are in proper location, and ready for roughing into masonry work. 4. Anchors: Inspect dovetail anchor slots cast into concrete for proper installation. UNIT MASONRY ASSEMBLIES 04810-4

3.02 PREPARATION A. Wetting Brick: 1. Wet brick with absorption rates in excess of 30 g./30 sq. in./min. (30 g./194 cm2/min.) determined by ASTM C 67-, so that rate of absorption when laid does not exceed this amount. 2. Recommended procedure to insure that brick are nearly saturated, surface dry when laid is to place a hose on the pile of brick until the water runs from the pile. This should be done one day before brick are to be used. In extremely warm weather, place hose on pile several hours before brick are to be used. B. Cleaning Reinforcement: Before being placed, remove loose rust, ice and other coatings from reinforcement. C. Cooperation: Check relationship of masonry to work under other sections, cooperate with others and proceed as desirable for general progress and best interest of project. 1. Direct and coordinate placement of metal anchors supplied for installation under other sections. D. 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. 1. Adjust masonry dimensions and install starter units as required to eliminate small cuts and to maintain bond. Cut neatly around contacting work. 2. Masonry dimensions for exterior openings are nominal. Lay out masonry openings to provide 1/4 inch maximum sealant joint at metal frames. C. Concrete Masonry Units: 1. Bond: Running. 2. Coursing: One unit and one mortar joint to equal 8 inches (200 mm). 3. Mortar Joints: Concave. D. Brick Units: 1. Bond: Running, Stack, or Diagonal. See elevations for details. 2. Coursing: Three units and three mortar joints to equal 8 inches (200 mm). 3. Mortar Joints: Concave. 4. Use 100 percent solid units for top course of exterior piers, walls, window sills, etc. as indicated and required. 5. Use 100 percent solid units at corbels, at rowlocks, for soldier courses in bearing walls and wherever cores of hollow units would be exposed to view or weather. 3.04 PLACING AND BONDING A. Mortar Joints: 1. Lay solid masonry units in full bed of mortar, with full head joints, uniformly jointed with other work. 2. Lay hollow masonry units with face shell bedding on head and bed joints. 3. Buttering corners of joints or excessive furrowing of mortar joints is not permitted. 4. Cut mortar joints flush where wall tile is scheduled, resilient base is scheduled, or bitumen dampproofing is applied. 5. Remove excess mortar as work progresses. UNIT MASONRY ASSEMBLIES 04810-5

B. Bonding: Interlock intersections and external corners. C. Fitting: 1. Do not shift or tap masonry units after mortar has achieved initial set. Where adjustment must be made, remove mortar and replace. 2. Perform job site cutting of masonry units with proper tools to provide straight, clean, unchipped edges. Prevent broken masonry unit corners or edges. D. Isolation from Structural Elements: 1. Isolate masonry partitions from vertical structural framing members with a control joint. 2. Isolate top joint of masonry partitions from horizontal structural framing members and slabs or decks with compressible joint filler. 3.05 CAVITY WALL A. Build inner wythe ahead of outer wythe to receive cavity insulation and air/vapor barrier adhesive. 3.06 JOINT REINFORCEMENT AND ANCHORAGE A. Horizontal Joint Reinforcement: Install 16 inches (400 mm) on center. 1. Place masonry joint reinforcement in first and second horizontal joints above and below openings. Extend minimum 24 inches (610 mm) each side of opening. 2. Place continuous joint reinforcement in first and second joint below top of walls. 3. Lap joint reinforcement ends minimum 6 inches (150 mm). 4. Use prefabricated corners and tees. B. Stud Back-Up: Secure veneer anchors to stud framed back-up and embed into masonry veneer at maximum 16 inches (400 mm) on center vertically and centered on studs, but not more than 24 inches (600 mm) on center horizontally. Place additional anchors at perimeter of openings and ends of panels, at maximum spacing of 8 (200 mm) on center. 1. Horizontal Joint Reinforcement: Not required at veneer anchored to stud framing. 3.07 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. 1. Install at heads and sills of all openings. 2. Install at top of shelf angles, spandrels, and other supports that interrupt outer wythe. 3. Install at base of walls above finish grade. 4. Install flashing full width in slurry bed of fresh mortar as indicated and in accordance with manufacturer's recommendations. B. Remove or cover protrusions or sharp edges that could puncture flashings. C. Masonry Cavity Walls: Extend flashing through outer wythe, turned up a minimum of 6 inches (50 mm) above top of cavity drainage material, but not less than 8 inches (200 mm), and through inner wythe. 1. Where interior face of wall is exposed, carry flashing to within 1/2 inch (13 mm) of the interior face of the wall. 2. Where interior surface of inner wythe is concealed by furring, carry flashing completely through inner wythe and turn flashing up 2 inches (50 mm). D. Masonry-Veneer Walls: Extend flashing through veneer, turned up a minimum of 6 inches (150 mm) above top of cavity drainage material, but not less than 8 inches (200 mm), and behind airinfiltration barrier or building paper. E. Lintels and Shelf Angles: Extend flashing a minimum of 4 inches (100 mm) into masonry at each end. UNIT MASONRY ASSEMBLIES 04810-6

F. Heads and Sills: Extend flashing 4 inches (100 mm) at ends and turn flashing up not less than 4 inches (100 mm) to form a pan. G. Extend flashings 1/4 inch (6 mm) beyond exterior face of masonry and turn down to form drip. 1. Install material resistant to UV and compatible with sealants being used. H. Seal lapped ends and penetrations of flashing before covering with mortar. I. Lap end joints of flashings at least 4 inches (100 mm) and seal watertight with mastic or elastic sealant. J. Cavity Drainage Net: Install above masonry flashing as recommended by manufacturer. 3.08 LINTELS A. Install loose steel lintels over openings. B. Maintain minimum 6 inch (150 mm) bearing on each side of opening. 3.09 GROUTED COMPONENTS A. General: Where indicated on Structural Drawings, reinforce masonry unit cores or cavities with deformed steel reinforcing bars and grout as indicated. B. Layout: Build reinforced hollow unit masonry to preserve unobstructed vertical continuity of cells to be filled. C. Reinforcement: 1. Lap splices minimum 36 bar diameters. 2. Support and secure reinforcing bars from displacement. Maintain position within 1/2 inch (13 mm) of dimensioned position. D. Grouting: See Section 04065. 1. Place and consolidate grout fill without displacing reinforcing. 2. At bearing locations, fill masonry cores with grout for a minimum 12 inches (300 mm) either side of opening. 3. Grout spaces less than two inches in width with fine grout using low lift grouting techniques. In spaces greater than two inches use coarse grout using high or low lift grouting techniques. 4. Hold mortar in bed joints back 1/4 inch from edges of masonry unit adjacent to grout spaces, bevel back and upward from grout space. Keep mortar droppings out of grout spaces. Head and bed joints shall be shoved at least 1/2 inch into place. 5. When the grouting is stopped for one hour or longer, stop placing of grout minimum of one inch below top of uppermost unit. 6. Low Lift Grouting: Limit height of pours to 12 inches (300 mm). Immediately puddle grout spaces with stick or rod (not trowel) sufficiently to cause grout to flow into spaces between masonry units. 3.10 CONTROL AND EXPANSION JOINTS A. Install control joints where indicated on Drawings and in following locations: 1. Continuous vertical joints that are not toothed. 2. Horizontal joints between non-bearing masonry and structural deck above. 3. Concrete Masonry: As recommended by NCMA TEK 10-2A. 4. Brick Masonry: As recommended by BIA Technical Note 18A. B. Do not continue horizontal joint reinforcement through control and expansion joints. UNIT MASONRY ASSEMBLIES 04810-7

C. Form control joint with a sheet building paper bond breaker fitted to one side of the hollow contour end of the block unit. Fill the resultant core with grout fill. Rake joint at exposed unit faces for placement of backer rod and sealant. D. Install preformed control joint device in continuous lengths. Seal butt and corner joints in accordance with manufacturer's instructions. E. Size control joint in accordance with Section 07900 for sealant performance. F. Form expansion joint as detailed. 3.11 BUILT-IN WORK A. As work progresses, install built-in architectural cast stone, metal door frames, glazed frames, fabricated metal frames, window frames, wood nailing strips, anchor bolts, and plates and other items to be built into the work and furnished under other sections. 1. Install sleeves of proper size provided by others, where directed, to permit passage of pipes through walls. Build-in wall sleeves, anchors, plates, and other members provided by others. Properly set built-in items as walls progress and under direction of party providing built-in items. 2. Install built-in items plumb, level, and true to line. 3. Bed anchors of metal door and glazed frames in adjacent mortar joints. Fill frame voids solid with grout as wall is built. a. Fill adjacent masonry cores with grout minimum 12 inches (300 mm) from framed openings. b. Do not build into masonry construction organic materials that are subject to deterioration. 4. Access Panels: Install access panels occurring in masonry walls. a. Access Panels: Furnished under other sections. See Section 08310. b. Accurately locate as directed. 5. Cavity Wall Insulation: Install with adhesive as recommended by manufacturer. a. Provide small pads of mortar or adhesive spaced approximately 12 inches (300 mm) OC both ways on inside face. b. Fit boards of insulation between joint reinforcement and other confining obstructions in cavity. Tightly butt edges both ways. Press units firmly against inside wythe of masonry. c. Wedge insulation from outside wythe with small fragments of masonry spaced 24 inches (600 mm) OC both ways. 6. Embedded Sheet Metal: Install embedded sheet metal flashing, reglets, etc., provided by others. Clean surfaces of masonry smooth and free from projections which might puncture or otherwise damage embedded materials. Place embedded items on bed of fresh mortar. Cover with fresh mortar before laying succeeding courses. 7. Chases and Recesses: Provide chases in masonry walls as indicated and required for mechanical and electrical work for pipes and conduits. Build recesses as required for accommodation of cases and cabinets, radiators, and unit heaters. Install lintels for recesses over 16 inches (400 mm) in width. 3.12 TOLERANCES A. See Section 01400. Comply with following tolerances: 1. Maximum Variation From Unit to Adjacent Unit: 1/16 inch (1.6 mm). 2. Maximum Variation from Plane of Wall: 1/4 inch in 10 ft (6 mm/3 m) and 1/2 inch in 20 ft (13 mm/6 m) or more. 3. Maximum Variation from Plumb: 1/4 inch (6 mm) per story non-cumulative; 1/2 inch (13 mm) in two stories or more. 4. Maximum Variation from Level Coursing: 1/8 inch in 3 ft (3 mm/m) and 1/4 inch in 10 ft (6 UNIT MASONRY ASSEMBLIES 04810-8

mm/3 m); 1/2 inch in 30 ft (13 mm/9 m). 5. Maximum Variation of Joint Thickness: 1/8 inch in 3 ft (3 mm/m). 3.13 CUTTING AND FITTING A. Cut and fit for chases, pipes, conduit, sleeves, and grounds. Coordinate with other sections of work to provide correct size, shape, and location. 1. Where cutting of units is necessary, make cuts with experienced mechanics in workmanlike manner, using motor-driven masonry saw. 2. Obtain approval prior to cutting or fitting masonry work not indicated or where appearance or strength of masonry work may be impaired. 3.14 STARTING AND STOPPING A. Where fresh masonry joins partially or totally set masonry, clean exposed surfaces of set masonry and wet lightly to obtain good bond with new work. Remove loose masonry and mortar. If it is necessary to stop off horizontal run of masonry, step back 1/2 masonry unit length in each course. Do not tooth. 3.15 FIELD QUALITY CONTROL A. An independent testing agency will perform field quality control tests, as specified in Section 01400. B. Concrete Masonry Unit Tests: Test each variety of concrete unit masonry in accordance with ASTM C 140. C. Tests shall have been made on individual masonry units within last four months. D. Mortar Tests: Test each type of mortar in accordance with ASTM C 780, testing with same frequency as masonry samples. 1. Current mortar test including mortar proportions. E. Current prism test. 1. Include mortar and grout proportions used in test specimens. 2. Substantiate that each type of masonry assemblage meets or exceeds required 28 day compressive strength (f'm). 3.16 POINTING AND CLEANING A. Pointing: Cut out defective joints and holes in exposed masonry and repoint with mortar to match existing mortar. B. Cleaning: 1. Remove excess mortar and mortar smears as work progresses. 2. At end of each day turn scaffold boards over and brush down walls to remove mortar droppings from face of wall. 3. Dry brush masonry surface after mortar has set after final pointing. 4. Acid Solutions: Not allowed for cleaning unless specifically approved by Owner. 5. Clean masonry in accordance with manufacturer's recommendations and BIA Tech Note 20 - "Cleaning Guide for New Masonry", latest edition, Table 1. Follow directions carefully, including presoak and rinsing. a. Use non-metallic tools in cleaning operations. b. Sand finish brick and molded brick: Do not power wash. 6. Upon completion of pointing and cleaning leave the work area and surrounding surfaces clean and free of mortar spots, droppings and broken masonry. 3.17 PROTECTION OF FINISHED WORK UNIT MASONRY ASSEMBLIES 04810-9

A. Moisture Protection During Installation: Where exposed to weather, cover top of masonry walls at end of each day's work using waterproof material weighted down to insure its remaining in place. Maintain such protection until top of wall is made permanently weatherproof by final capping and flashing. B. Mud Splatter Protection: Attach minimum of 4 feet (1200 mm) of 6 mil polyethylene sheet to base of masonry walls to prevent staining by mud splatter. Maintain until landscaping and paving adjacent to building is complete. Remove at end of Project. END OF SECTION UNIT MASONRY ASSEMBLIES 04810-10