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' 40-27 BUILDING CAST -IN -PLACE CONCRETE <br />BRPH ARCHITECTS -ENGINEERS, INC. <br />C. When forms are reused, clean surfaces, remove fins and laitance, and tighten to close <br />joints. Align and secure joints to avoid offsets. Do not use patched forms for exposed <br />concrete surfaces unless approved by Engineer. <br />' 3.4 VAPOR RETARDERS <br />A. Sheet Vapor Retarders: Place, protect, and repair sheet vapor retarder according to <br />ASTM E 1643 and manufacturer's written instructions. <br />1. Lap joints 6 inches and seal with manufacturer's recommended tape. <br />2. Place slip sheet over bottom vapor retarder. <br />' 3. Vapor retarder installation must be approved before concrete placement. <br />3.5 STEEL REINFORCEMENT <br />A. General: Comply with CRSI's "Manual of Standard Practice" for placing reinforcement. <br />1. Do not cut or puncture vapor retarder. Repair damage and reseal vapor retarder <br />before placing concrete. <br />B. Clean reinforcement of loose rust and mill scale, earth, ice, and other foreign materials <br />that would reduce bond to concrete. <br />' C. Accurately position, support, and secure reinforcement against displacement. Locate <br />and support reinforcement with bar supports to maintain minimum concrete cover. Do <br />not tack weld crossing reinforcing bars. <br />iD. Set wire ties with ends directed into concrete, not toward exposed concrete surfaces. <br />' E. Install welded wire reinforcement in longest practicable lengths on bar supports spaced <br />to minimize sagging. Lap edges and ends of adjoining sheets at least one mesh <br />spacing. Offset laps of adjoining sheet widths to prevent continuous laps in either <br />direction. Lace overlaps with wire. <br />3.6 JOINTS <br />A. General: Construct joints true to line with faces perpendicular to surface plane of <br />concrete. <br />B. Construction Joints: Install so strength and appearance of concrete are not impaired, <br />at locations indicated or as approved by Engineer. <br />' 1. Place joints perpendicular to main reinforcement. Continue reinforcement across <br />construction joints unless otherwise indicated. Do not continue reinforcement <br />through sides of strip placements of floors and slabs. <br />1 2. Form keyed joints as indicated. Embed keys at least 1-112 inches into concrete. <br />3. Use epoxy -bonding adhesive at locations where fresh concrete is placed against <br />hardened or partially hardened concrete surfaces. <br />' 4. Install construction Diamond Dowels per manufacturer's installation instructions. <br />C06922.001.00 03 30 04 - 11 <br />05-22-14 <br />