Garage Attic Insulation Vapor Barrier

Adding a second vapor barrier could cause condensation to become trapped in the insulation between the two vapor barriers.

Garage attic insulation vapor barrier.

In mixed climate areas the vapor barrier is optional depending on the total design of a building. Your first job after the studs are in place is to fill those walls with insulation. 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. The insulation fiberglass or cellulose is then placed on top of the drywall with no vapor barrier above or below.

Attic insulation should always be installed with the paper backing facing toward the living space the ceiling in this case. In cold climates a vapor barrier is almost always needed. The facing on faced insulation acts as a vapor retarder. Not every wall does.

If you need a vapor barrier and your insulation is unfaced you must cover it with a polyethylene film. This acts as a barrier to keep heated moist air from rising up into the attic during cold weather. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. The classic answer is that the vapor barrier goes on the warm in winter side of the assembly.

If you are not sure if you need insulation in your walls follow along with this flow chart.