Description Thermally efficient cross ventilated non-structural composite insulation. Consisting of ACFoam®-II or ACFoam®-III polyisocyanurate (polyiso) insulation board and a min. 7/16” APA/TECO rated OSB or min. 19/32” CDX plywood separated with and bonded to 5 individual 1.0”, 1.5” or 2.0” vent spacer strips. ACFoam CrossVent is offered in a variety of composite thicknesses, providing long-term thermal resistance (LTTR) values from 5.7 to 23.6. Made to order in 4ft x 8ft (1220mm x 2440mm) panels with a nominal thickness of 2.5” to 6.5”. Manufactured in accordance with ASTM C1289, Type V.