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' <br /> A. General: Place vapor retarderlbazrier sheeting in position with longest dimension parallel <br /> with direcrion of pour. � <br /> B. Lap joints 6 inches and seal with manufacturer's recommended mastic or pressure- <br /> sensitive tape. <br /> 1. PLACING REINFORCEMENT , <br /> A. General: Comply with Concrete Reinforcing Steel Institute's recommended practice for ' <br /> "Placing Reinforcing Bars," for details and methods of reinforcement placement and <br /> supports and as specified. <br /> 1. Avoiding cutting or puncturing vapor retarder/barrier during reinfarcement ' <br /> placement and concreting operations. Repair damages before placing concrete. <br /> B. Clean reinforcement of loose nist and mill scale, eatth, ice, and ottter materials that ' <br /> reduce or destroy bond with concrete. <br /> C. Accurately position, support, and secure rainforcement against dispiacement. Locate and , <br /> support reinforcung hy metal chairs, runners, bolsters, spacers, and hangers, as approved <br /> by Architect. <br /> D. Place reinforcement to maintain minimum coverages as indicated for concrete protection. ' <br /> Arrange, space, and securely tie bars and bar supports to hold reinforcement in position <br /> during concrete placement operations. Set wire ties so ends are directed into concrete,not <br /> toward exposed concrete surfaces. ' <br /> E. Install welded wire fabric in lengths as Iong as practicable.Lap adjoining pieces at ieast <br /> one full mesh and lace splices with wire. Offset Iaps of adjoining widths to prevent <br /> continuous laps in either direction. , <br /> � 3.4 JOINTS <br /> A. Waterstops: Provide waterstops in construction joints as indicated. Install waterstops to , <br /> form continuous diaphragm in each join� Support and protect exposed waterstops during <br /> progress of Work. Field-fabricate joints in waterstops according to manufachuer's printed <br /> instructions. , <br /> B Isolation Joints in Slabs-on�{'rrade: Conshuct isolation joints in slabs-on-grade at points <br /> of contact between slabs-on-grade and vertical surfaces, such as coiumn pedestals, ' <br /> foundation waUs,grade beams,and other locations,as indicated. <br /> 1. Joint fillers and sealants are specified in Division 7 Section"Joint Sealants." <br /> C. Contraction(Control)Joints in Slabs-on-Grade: Construct contraction joints in slabs-on- ' <br /> gra.de to form panels of patterns as s�own. Use saw cuts 1!8 inch wide by one-fourth of <br /> slab depth or inserts 1/4 inch wide by one-fourth of slab depth,unfess otherwise indicated. , <br /> 1. Form contraction joints by inserting premolded plastic, hardboard, or fiberbaard <br /> strip into fresh concrete until top surface of strip is flush vrith slab surface. Tool <br /> slab edges round on each side of insert. After concrete has cured, reznove inserts ' <br /> and clean groove of loose debris. <br /> 2. Contraction joints in uneazposed slabs may be formed by sa.w cuts as soon as <br /> possible after sIab finishing as may be safely done wrthout dislodging aggregate. , <br /> 3. If joint pattern is not shown, provide joints not exceeding 15 feet in either <br /> direction and located to canform to bay spacing wherever possible (at cfllumn <br /> centerlines,half bays,third bays). <br /> 4. Joint fillers and sea.lants are specified in Division 7 Section"Joint Sealants." ' <br /> 3.5 CONCRETE PLACEMENT <br /> CONCRETE Pa e 4 of 8 ' <br /> S <br />