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� <br /> A. General: Place vapor retarder/barrier sheeting in position with longest dimension parallel <br /> with direcNon of pour. , <br /> B. Lap joints 6 inches and seal with manufacturer's recommended mastic or pressure- <br /> sensitive tape. � <br /> 1. PLACING REIl�ORCEMENT <br /> A. General: Comply with Conarete Reinforcing Steel Institute's zecommended practice for � <br /> "Placing Reinforcing Bars," for details and methods of reinforcement place�nent and <br /> supports and as specified. <br /> 1. Avoiding cntting or puncturing vapor retarder/barrier during reinforcement , <br /> placement and concreting operations. Repair damages before placing concrete. <br /> B. Clean reinforcement of loose nist and mill scale, earth, ice, and other materials that � <br /> reduce or destroy bond with concrete. <br /> C. Accurately position, support, and secure reinforcement against dispiacement. Locate and � <br /> support reinforcing hy metal chairs, r�mners, bolsters, spacers, and hangers, as approveci <br /> by Architect. <br /> D. Place reinforcement to main#ain minimum coverages as indicated for concrete protection. � <br /> Arrange, space, and securely tie bars and bar supports to hold reinforcennent in position <br /> during concrete placement operations. Set wire ties so snds are directed into concrete,not <br /> toward exposed concrete surfaces. , <br /> E. Instail welded wira fabric in lengths as long as practicable.Lap adjoining pieces at ieast <br /> one full mesh and lace splices with wire. Offset laps of adjoining widths to prevent <br /> continuous iaps in either direction. � <br /> 3.4 JOINTS <br /> A. Waterstops: Pmvide waCerstops in construction joints as indicated. Install waterstops to , <br /> form continnous diaphragm in each join� Support and protect exposed waterstops during <br /> progress of Work. Fieid-fabricate joints in waterstops according to manufacteuer's printed <br /> ittstructions. , <br /> B Isolation Joints in Slabs-on-Gtade: Construct isolation joints in slabs-on-grade at points <br /> of contact between slabs-on-grade and vertical surface.s, such as column pedestals, � <br /> foandation walls,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 contcaction joints in slabs-on- , <br /> grade to form panels of patterns as shown. Use saw cuts 1/8 inch wide by one-fourtli of <br /> slab depth or inserts 1/4 inch wide by one-fowrth of slab depth,unless otherwise indicated. � <br /> 1. Form contraction joints by inserting premolded pIastic, hardboard, or fiberboard <br /> strip into firesh cancrete until top surface of strip is flush vrith slab surface. Tool <br /> slab edges round on each side of insert. After concrete has cured, remove inserts ' <br /> and clean groove of loose debris. <br /> 2. Contraction joints in unexposed slabs may be formed hy saw cuts as soon as <br /> possible after slab fmishin�g as may be safely done wrthout dislodging aggregate. � <br /> 3. If joint pattern is not showa, provide joints not exceeding 15 feet in either <br /> direction and located to conform to bay spacing wherever possible (at colurnn <br /> centerlines,half bays,third bays). <br /> 4. Joint fillers and sealants are specified in Division 7 Section"Joint Sealants." / <br /> 3.5 CONCRETE PLACEMENT <br /> CONCRETE Page 4 of 8 <br /> ' <br />