Furnish Sure-Seal 60 mil EPDM (Ethylene, Propylene, Diene Terpolymer) in the largest sheet possible with 3” Factory-Applied Tape (FAT). (Splice tape shall be a butyl/EPDM-based polymer with a minimum thickness of 25 mil.) The membrane shall conform to the minimum physical properties of ASTM D4637. When a 10-foot-wide membrane is to be used, the membrane shall be manufactured in a single panel with no factory splices to reduce splice intersections. 2.03 INSULATION/UNDERLAYMENT A. When applicable, insulation shall be installed in multiple layers. The first and second layer of insulation shall be adhered to the substrate in accordance with the manufacturer’s published specifications. B. Insulation shall be (1) one layer of 2.6” Polyisocyanurate as supplied by Carlisle SynTec. The minimum R-value required is 30. Tapered insulation to the drains will also be required. (Note: The insulation must meet ASHRAE 90.1 minimums per IBC-International Building Code.) 1. Carlisle Insulbase Polyisocyanurate – A foam core insulation board covered on both sides with a medium-weight fiber-reinforced felt facer meeting ASTM C 1289-06, Type II, Class 1, Grade 2 (20 psi) or Grade 3 (25 psi). The product is available in 4’ x 8’ standard size with a thickness from 1 to 4 inches. 4’ x 4’ tapered panels are also available...
