near founda � on walls and in the center of the room. Minimal sample size is 3 samples per 1,000 sq. � . of area and one test for every 1,000 sq. � . therea � er. Moisture content should meet the following criteria: Ph level of concrete should be between 5-9 Rela � ve Humidity Tes � ng should be less than 85% max. when u � lizing in-situ probe (ASTM F2170). Less than 8 pounds per 1,000 sq. � . per 24 hours MVER (Moisture Vapor Emission Ra � ng) when u � lizing a Calcium Chloride test (ASTM F1869). The fi nal responsibility for determining if the concrete is dry enough for installa � on of resilient fl ooring (LVP) lies with the fl oor covering installer. Note: Concrete moisture content may be acceptable at the � me of the test, but these tests do not guarantee a perpetual “dry” concrete slab. The concrete slab moisture content can vary at di ff erent � mes of the year. Manufacturer and distributor are not responsible for moisture related damage to installed fl ooring. Wood Sub fl oor Requirements The sub fl oor must be clean with no construc � on debris, nails, soil, mud and any other objects on or adhering to the fl oor. Floor should be swept clean before the installa � on. The sub fl oor must be structurally sound and stable with no movements or squeaks, no loose panels or nails and no signs of delamina � on or other damage. The sub fl oor must be fl at to within 3/16-in in a 10 � . span with no visible bumps or low spots. Test for moisture using a reliable meter. Perform tests at loca � ons around exterior
doorways, near founda � on walls, near walls containing plumbing and also in the center of the room. Measure 20 loca � ons per 1,000 sq. � . Moisture content of the subfloor should be less than 12%. Plywood or Oriented Strand Board (OSB) Speci fi ca � ons On truss/joist spacing of 16-inches (406mm) O/C or less, the industry standard for single panel sub fl ooring is a minimum 5/8-inch (19/32-in, 15.1mm) C-D Exposure 1 plywood sub fl oor panels or 23/32-inch OSB Exposure 1 sub fl oor panels 4 � . x 8 � . sheets. The expansion gap between panels should be 1/8- inch (3mm). If panels are not tongued and grooved and there is not su ffi cient spacing or spacing is inadequate, cut in the required spacing with a circular saw. Do not cut in expansion space on tongue and groove panels. Exis � ng Floors Installa � on over an exis � ng fl oor requires the installer to consider poten � al issues related to moisture damage, adhesive failure, fastener failure and hidden issues with the sub fl oor under the exis � ng fl ooring. Acceptable fl oor coverings include solid hardwood, linoleum (1 layer only), terrazzo, ceramic, porcelain and stone � le. Tile fl oors with grout lines larger than ¼-inch will require a cemen �� ous leveling compound to fi ll in any grout lines, voids, or cracks. Unacceptable fl oor coverings include carpet (all types) foam underlayment, cushioned back vinyl, rubber, cork, laminates, free fl oa � ng fl oors and wooden fl oors over concrete.
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