Page 7 - Polycoat 1.1 Table of Contents
P. 7

SECTION 1.3
                                                                                      GENERAL GUIDELINES







        SURFACE PREPARATION                                   Plywood must be exterior grade plywood, having either
        Concrete  or plywood substrates must be free  of all   tongue-and-groove edges and ends perpendicular to supports.
        contamination that may impair proper bonding. Substrates   The plywood will be 19/32” (1.50 cm) or 21/32” (1.67 cm) thick.
        must be sloped a minimum of 1/4” (0.65 cm) per foot for   Plywood should be installed with a maximum of 1/16” (0.16
        drainage, and must be primed with the applicable primer   cm) space between the plywood sheets and laid over joists
        prior to application of the membrane and surface protection   on 16” (40.64 cm) centers. Plywood sheets must be screwed
        materials.
                                                              down securely or nailed with coated annular ring or screw
        Concrete: The surface of concrete substrates must be clean   shank nails.
        and free of standing water. All holes, joints and cracks must   If the underside of the joists is covered, the floor/ceiling cavity
        be pointed flush with Portland Cement mortar and all high   must be vented to aid in drying and to minimize moisture
        spots cut or ground off to provide a smooth, even surface.  buildup in the deck structure.
        Before the material is applied, the substrate must be clean   Damaged panels will be repaired/replaced before coating.
        and free of dust or foreign material. Paint, grease and oil must
        be removed either by grinding or sandblasting and concrete   Old plywood must be cleaned and sanded before priming
                                                                           ®
        surfaces must be shot blasted or water blasted. Control joints   with Polyprime  at a rate of 1 gallon/200-300 sqft (0.14-0.20
        should be cut per standard concrete construction practices   liters/sqm) or 200-300 sqft/gallon prior to coating application.
        and caulked.                                          Refer to Technical Data Sheets for proper application rates.
        Concrete must exhibit 3000 psi minimum. Concrete surfaces   The only acceptable grade of plywood is APA rated, exterior
        to be coated must be trowel finished in compliance with   grade with exterior glue or better.
        the American  Concrete  Institute  standards  (except  that   The appearance and physical characteristics of the plywood
        hand troweling is not required), followed by a fine-haired   and grade should be considered.
        brooming, left free of loose particles, and shall be without   Note: The above plywood grade is called out in compliance
        ridges, projections, voids and concrete droppings that would   with the American Plywood Association’s Standard. Plywood
        be mechanically detrimental to coating application or function.
                                                              grading which does not reference APA markings may not be
        New and Old Concrete: Refer to SSPC-SP13/NACE 6, or ICRI   a suitable grade.
        03732: CSP 3-5.  New concrete must be cured for 28 days prior   No liability is assumed by Polycoat Products for defects in
        to product application. Surface must be clean, dry, sound   the substrate.
        and offer sufficient profile for product adhesion. Remove
        all dust, dirt, oil, form release agents, curing compounds,   PROTECTION OF WORK
        salts, efflorescence, laitance and other foreign matter by shot   While work is underway and for 72 hours thereafter, traffic
        blasting and/or suitable chemical means, in accordance with   from other trades should be stopped.
        local chemical regulations. Rinse thoroughly, to achieve a pH   Material should be stored on plywood or non-asphaltic
        between 8.0 and 11.0. Allow to dry completely. If old concrete   insulation board.
        has a surface that has deteriorated to an unacceptably rough
        surface, Polycoat Products PC-260 or a mixture of Polyprime ®   Adjacent surfaces which are not to be coated, such as walls,
        21 and sand should be used as a repair agent for cracks, spalls,   thresholds, fascia, etc., should be carefully masked before
        bug holes and voids.  Upon full cure of the repair agent, prime   priming and coating. Mask vertical surfaces at the line detailed
        the entire surface intended for coating.              in the architectural drawings or, if none is shown, mask 4”
                                                              (10.14 cm) or more up from the deck. When coatings are
        Concrete Surface Preparation Reference:               applied by spray, caution is necessary, particularly during
                                                              windy weather, to prevent overspray damage.
          •  ASTM D4258 - Standard practice for cleaning concrete
          •  ASTM D4259 - Standard practice for abrading concrete  Section 3: Priming
          •  ASTM D4260 - Standard practice for etching concrete  Polycoat Products elastomeric coatings frequently require
          •  ASTM F1869 - Standard test method for measuring   a primer. The preferred primer varies with the substrate
            moisture vapor emission rate of concrete          as described below. Guide specifications state primer
          •  ICRI 03732 - Concrete surface preparation        requirements. Product data sheets contain application
                                                              instructions.
        Neat cement sacking is not an acceptable surface preparation
        for coatings.                                         CONCRETE
                                                              Sealing Concrete: Most concrete has surface porosity,
        Plywood: Plywood should be new or cleaned and sanded.



        POLYCOAT PRODUCTS TEL 562.802.8834  |  FAX 562.921.7363                                           Section 1.3
        wpsales@polycoatusa.com  |  www.polycoatusa.com
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