Energy Efficiency In One Easy Step: ACFoam® CrossVent™ RB

March 9th, 2010

Did you know that with radiant heat an outside temperature of as little as 69 degrees can quickly heat a roof surface to over 140F? This effect is referred to as radiant heat transfer. Standard nailbase insulations do a great job of reducing conductive heat transfer. However, they do little to reduce radiant heat transfer, which contributes significantly to the total heat flow into a building. That is the reason Atlas developed CrossVent® RB (Radiant Barrier). The radiant barrier prevents most radiant heat transfer and significantly reduces the temperature gradient across the polyiso board.

CrossVent® RB combines a perforated, breathable, low-emissivity foil radiant barrier OSB with Polyiso insulation that provides unsurpassed thermal efficiency. The polyiso insulation board is designed with 1.0”, 1.5” or 2.0” vent spacer strips. These strips separate the 7/16” APA/TECO rated radiant barrier OSB from the polyiso foam insulation to create a cross-ventilating air space. The spacer strips allow air to flow through the air space thereby helping to further dissipate heat build-up and saving you money in energy costs. Studies show that the radiant barrier in CrossVent® RB prevents up to 97% of radiant energy from reaching the air space, substantially increasing the thermal efficiency of CrossVent® RB. When additional thermal efficiency is designed beyond the R-value of the foam insulation CrossVent® RB is an excellent choice.

CrossVent® RB is HCFC-free and provides excellent LTTR values, and a 20-year thermal warranty. It is made to order in 4’x8’ (1220mm x 2440mm) size panels and in nominal thicknesses of 2.5” to 6.5”. It is recommended for use over sloped unventilated roof decks.