Garage Attic Insulation Vapor Barrier

The facing on faced insulation acts as a vapor retarder.

Garage attic insulation vapor barrier. In mixed climate areas the vapor barrier is optional depending on the total design of a building. The insulation fiberglass or cellulose is then placed on top of the drywall with no vapor barrier above or below. Not every wall does. The classic answer is that the vapor barrier goes on the warm in winter side of the assembly.

The best approach for a vented attic in a cold climate is installing a layer of drywall with a good coat of latex paint the paint creates a semi permeable vapor barrier. In cold climates a vapor barrier is almost always needed. If you need a vapor barrier and your insulation is unfaced you must cover it with a polyethylene film. Adding a second vapor barrier could cause condensation to become trapped in the insulation between the two vapor barriers.

This acts as a barrier to keep heated moist air from rising up into the attic during cold weather. You don t mention whether there is a bonus room or living space above the garage. Vapour barrier is on the top of the rafter then insul then board if heating garage insul vapour then board need hatch for summer to let out hot air i m a insulator typar is a better product in a. Attic insulation should always be installed with the paper backing facing toward the living space the ceiling in this case.

If your garage is 45 degrees and you have a bonus room heated to 72 degrees above the garage the vapor retarder faces the upstairs room.