Atlas AC Foam Nail Base 4.5"x4'x8' 7/16" OSB / 4" Polyiso

4' x 8', 4.5" Thick, -100 Deg F to 250 Deg F, 25 PSI Compressive Strength, 24.2 Long Term Thermal Resistance, Closed Cell Polyisocyanurate Foam, ACFoam® Roof Insulation

Thermally efficient closed-cell ACFoam®-II or ACFoam®-III polyisocyanurate (polyiso) insulation board bonded to min. 7/16 inch APA/TECO rated OSB or min. 19/32 inch CDX plywood on the top face. ACFoam Nail Base is offered in a variety of composite thicknesses, providing long-term thermal resistance (LTTR) values from 6.3 to 24.2. Made to order in 4ft x 8ft (1220mm x 2440mm) panels with a nominal thickness of 1.5 to 4.5 inch Manufactured in accordance with ASTM C1289, Type V.