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Sizes: ACFoam CrossVent is made to order in 4´ x 8´ (1220mm x 2440mm) size panels and in nominal thicknesses of 2.5" to 6.5". Custom vent spaces are available on special order.
*Long-term thermal resistance values (LTTR) of the polyiso foam were determined in accordance with CAN/ULC-S770 and ASTM C 1289-02, Annex A1. All test samples were third-party selected and tested by an accredited materials testing laboratory. The thermal resistance of air spaces does not apply when the air space in unsealed and subject to air exchange into and out of the air space, as occurs by design in cross ventilating nail base insulation with a high percentage of open air space. Therefore, only the LTTR of the ACFoam-II base layer is reported. See ASHRAE Handbook Fundamentals, 23.7 "Factors Affecting Heat Transfer Across Air Spaces."
R means resistance to heat flow. The higher the R-Value, the greater the insulating power. Compare insulation values before you buy. To get the marked R-Value, it is essential that this insulation be installed properly.
**RSI is the metric expression of LTTR (m2 • K/W) |
