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WATER VAPOR REDUCTION SYSTEM <br />Section 07260 <br />15-1207 <br />blast bee bees, etc. Repair all cracks, expansion joint, control Joints, and open surface <br />honeycombs and fill in accordance with Manufacturers recommendations. Inform water <br />vapor reduction system manufacturer if concrete additives like chlorides or any other soluble <br />compounds that can contaminate surfaces have been used in the concrete mix. Reinforcing <br />fibers (if provided in concrete) must be burned off, scraped and vacuumed, after shot <br />blasting, leaving no fibers left on the concrete surfaces. Provide uncontaminated, sound <br />surface. DO NOT ACID ETCH! <br />C. Repair concrete prior to water vapor reduction system installation by utilizing Koester SB <br />Bonding Emulsion with approved concrete repair materials. Comply with all requirements as <br />listed in Manufacturer's technical data information. Consult with water vapor reduction <br />manufacturer. <br />D. Make sure that surfaces to be treated with water vapor reduction system have NOT <br />previously been treated with other materials like underlayments, screeds, penetrating <br />sealants, etc. If this is the case, consult with the Manufacturer's Representative prior to any <br />application of water vapor reduction system. <br />E. Proper removal of contaminants can render surfaces too rough for certain flooring systems. <br />Therefore shot blast a small test area and verify with the flooring applicator that the surfaces <br />are fit to receive the specified flooring system without the application of an <br />underlayment/feather edge on top of the water vapor reduction system. <br />F. Broom -sweep and vacuum slab surfaces to remove dust and debris just prior to application. <br />3.03 INSTALLATION <br />A. Install at concrete substrates to receive carpet, VCT flooring, sheet vinyl flooring. <br />B. Do not install Water Vapor Reduction System at concrete floors that do not receive any floor <br />covering, nor at concrete substrates that are to receive Epoxy Flooring, Traffic -Bearing Deck <br />Surfacing, and floor coverings to be provided with Flooring Manufacturer's Moisture <br />Reduction Barrier. <br />C. Apply one coat of vapor retarder system at an average coverage rate of 100 sq. ft. /gallon <br />(15 lbs./ 1000 sf., 80 — 90% rH) using a squeegee and or 3/8 inch nap roller leaving NO <br />areas untreated. Allow to cure a minimum of 12 hours before installing flooring system. (See <br />additional application instructions in Manufacturer's technical data sheets.) The rate of <br />coverage shall be decreased, if and as recommended by the manufacturer of the water <br />vapor reduction system, based on the moisture and pH test. <br />D. Cementitious underlayment system Level -Pro with a non -porous substrate primer VAP -1® 06 <br />Primer or approved equal if required by Floor Covering Installer, or the Floor Covering <br />Manufacturer may be used to level any smooth surfaces after Shotblasting the floor on top of <br />the water reduction system. No underlayment system containing gypsum will be allowed. <br />When water based adhesives are utilized in the floor covering installation, use an approved <br />underlayment system with primer prior to the installation of the flooring system. Please <br />consult the adhesive manufacturer for their minimum recommended thickness of <br />cementitious underlayment to absorb excess moisture in the adhesive. Leveling of the <br />substrate shall not be considered part of the water vapor reduction system. No exceptions. <br />E. Contractor installing the finished flooring system should coordinate with the representative <br />5 <br />