Garage Attic Insulation Vapor Barrier

In cold climates a vapor barrier is almost always needed.

Garage attic insulation vapor barrier.

Not every wall does. The classic answer is that the vapor barrier goes on the warm in winter side of the assembly. If you need a vapor barrier and your insulation is unfaced you must cover it with a polyethylene film. Your first job after the studs are in place is to fill those walls with insulation.

After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. 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. 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.

The facing on faced insulation acts as a vapor retarder. 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. If you are not sure if you need insulation in your walls follow along with this flow chart. Adding a second vapor barrier could cause condensation to become trapped in the insulation between the two vapor barriers.

Attic insulation should always be installed with the paper backing facing toward the living space the ceiling in this case.