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Foil Faced Rigid Foam Insulation

By on October 9, 2011 in Home Design Journal

John Mansville AP Foil Faced Rigid Foam

John Mansville AP Foil Faced Rigid Foam

John Mansville AP Foil Faced Rigid Foam is a popular insulation applied to the exterior of an otherwise fiberglass insulated stud wall. At 2 inches thick, it has an insulation value of R-13. Added to an R-10, fiber batt insulated, 5.5 inch stud wall, you can achieve an R-33 wall. But you will need extension jambs on all doors and windows, and you have to apply vertical strapping to all foam surfaces, fastened to the studs behind them, so that you have something on which to fasten you clapboard, shingles or other finish siding.

There is some question about the benefit of foil facing. In many climates, there will be times during the Summer when the foil will create too much heat behind the finish siding, which will shorten the life of the siding, or even damage it on occasion. However, there may be an advantage to facing the foil to the interior to reflect heat from the inside back into the room. Still, the vapor barrier provided by the foil is useful pointed to the exterior. The alternative is to apply Typar or Tyvek building wrap.

Foil Faced Rigid Foam Insulation

Foil Faced Rigid Foam Insulation

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