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• <br /> • 3. It is the responsibility of the architect or engineer to determine if a vapor retarder <br /> is required. However, Mule -Hide follows the NRCA guidelines that recommend a <br /> vapor retarder be considered when both of two conditions are anticipated: <br /> a. The outside average January temperature is below40 °F, and <br /> b. The expected interior winter relative humidity is 45 percent or greater. <br /> C. Insulation <br /> 1. Insulation shall be installed as a protection layer over the existing substrate or to <br /> obtain a desired thermal value. <br /> 2. Insulation shall be compatible with the Mule -Hide PVC Membranes or have an <br /> acceptable slipsheet or cover board placed between the insulation and the PVC <br /> roof membrane. <br /> 3. The following insulation boards are acceptable for use in a Mule -Hide <br /> Mechanically Attached Roofing System when a standard warranty is requested: <br /> a. Polyisocyanurate insulations having nonasphaltic meeting or exceeding <br /> the physical property requirements of Fed. Spec HH -I -1972 and having a <br /> minimum compressive resistance of 18 psi. Thickness minimum is 1" or <br /> greater as required by insulation manufacturer to span flutes on metal <br /> decks. <br /> b. High density wood fiberboard with nonasphaltic binders. Boards with <br /> asphalt binders or have been coated with asphalt cannot be used in <br /> direct contact with the PVC membrane. Contact the insulation <br /> manufacturer for minimum thickness requirements when installing this <br /> board directly over a steel deck. <br /> c. Expanded polystyrene with kraft laminated facers on both sides or with <br /> an acceptable slip sheet or cover board placed over non -faced boards. <br /> Minimum density of nonfaced boards must be 1.25 PCF and meeting <br /> ASTM C578, Type 11 physical properties. Contact the EPS (expanded) <br /> manufacturer for minimum thickness requirements when spanning flutes <br /> on steel decks. <br /> d. Extruded polystyrene meeting ASTM C578, Types IV, VI or VII physical <br /> properties. An acceptable slipsheet or compatible cover board shall be <br /> required over the extruded polystyrene. Check with the EPS (extruded) <br /> manufacturer for minimum thickness requirements when spanning flutes <br /> on steel decks. <br /> 4. Insulation manufacturer shall provide its recommendations for use and <br /> attachment to the owner with a copy to Mule -Hide Products Co. In addition, the <br /> insuraif0h manufacturer shall provide a copy of their specific warranty conditions <br /> if required by the building owner. <br /> 2.05 Precautions <br /> A. Consult Material Safety Data Sheets and container labels for specific safety instructions <br /> prior to use. <br /> B. Avoid breathing vapors of solvent, sealant and adhesives. Use with adequate ventilation. <br /> Avoid prolonged contact of solvents, sealants and adhesives with skin. <br /> C. Do not use Mule -Hide PVC roofing products near fire or flame. <br /> 7 <br />