Specifications include, but are not limited to: Install membrane underlayment recover board over the substrate with boards butted tightly together with no joints or gaps greater than 1/4 inch. Mechanically fasten insulation to the substrate in accordance with roofing manufactures instructions to meet warranty, and if applicable, Factory Mutual requirements. Fasten insulation to resist uplift pressure at corners, perimeter, and field of roof to meet manufactures warranty requirements. Do not install wet, damaged or warped recovery boards. Miter and fill the edges of the insulation boards at ridges, valleys and other changes in plane to prevent open joints or irregular surfaces. Avoid breaking or crushing of the recovery board corners. Non-Reinforced Membrane: Furnish cured non-reinforced EPDM (Ethylene, Propylene, Diene, Terpolymer) conforming to the minimum physical properties of ASTM D4637 Type 1. Color: Black. Membrane Thickness: 60 mil nominal. Performance: Tensile Strength: 1550 psi (10.7 MPa) minimum.