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a. Shall be rigid polyisocyanurate roof insulation board with factory applied <br /> coated polymer bondedglass fiber mat facers on the top and bottom. <br /> Boards to comply with ASTM C1289 Type II,Class 2, Grade 2 and meet <br /> the following requirements: <br /> b. Curing time shall be 24 hours minimum, plus an additional 24 hours <br /> minimum per inch thickness, at a minimum of 60 degrees F before <br /> shipment from the manufacturer. <br /> c. Dimensional stability shall be 2 percent maximum linear change when <br /> conditioned at 158 degrees F and 97 percent relative humidity for seven <br /> days. <br /> d. Maximum permissible insulation board size for mechanical attachment is <br /> 4' x 8'. <br /> e. Thickness shall be two layers of 2"insulation. <br /> 2. Tapered Insulation System: <br /> a. Shall be rigid polyisocyanurate roof insulation board with factory applied <br /> coated polymer bonded glass fiber mat facers on the top and bottom. <br /> Boards to comply with ASTM C1289 Type II,Class 2,Grade 2 and meet <br /> the following requirements: <br /> b. Curing time shall be 24 hours minimum, plus an additional 24 hours <br /> minimum per inch thickness, at a minimum of 60 degrees F before <br /> shipment from the manufacturer. <br /> c. Dimensional stability shall be 2 percent maximum linear change when <br /> conditioned at 158 degrees F and 97 percent relative humidity for seven <br /> days. <br /> d. Board size shall be 4 foot by 4 foot. <br /> e. Slope shall be 1/4"per foot and minimum thickness shall be 1/2". <br /> f. Fill Insulation: Shall be rigid polyisocyanurate meeting the above <br /> requirements with board size of 4 foot by 4 foot and thickness of 2". <br /> g. Crickets and Saddles: Shall be rigid polyisocyanurate meeting the above <br /> requirements with a board size of 4 foot by 4 foot and 1/2" per foot <br /> slope. <br /> 3. Cover Board: Shall be cover board approved by roof system manufacturer. <br /> Board Size shall be 4' by 8' and minimum thickness shall be as listed below or as <br /> required by roof system manufacturer. Acceptable products include: <br /> a. Georgia Pacific 1/4"DensDeck Prime Roof Board <br /> B. Insulation Attachment Materials: <br /> 1. Steel Deck Mechanical Fasteners and Stress Plates: <br /> a. Shall be corrosion resistant 3" galvalume stress plate and corrosion <br /> resistant screw type fasteners for use with steel decks; approved by the <br /> insulation manufacturer for the insulation type, thickness and board size <br /> specified; fastener length as required by the fastener manufacturer for the <br /> insulation thickness specified, and to penetrate the deck a minimum of <br /> 3/4 inch and a maximum of 1 inch. <br /> Sebastian Corners Roof Replacement 07 22 16-3 Roof Insulation <br />