Garage Attic Insulation Vapor Barrier

Attic vapor barrier detail for cold climates 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.

Garage attic insulation vapor barrier.

On the other hand an air barrier a properly detailed air tight drywall ceiling for example in the absence of a vapor barrier can be effective since it stops the flow of vapor laden air. The insulation fiberglass or cellulose is then placed on top of the drywall with no vapor barrier above or below. If you live in a cold climate place the vapor barrier between the interior of your home and the insulation. A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter.

Not every wall does. This barrier is meant to keep moisture from getting to the insulation in the walls and ceilings and it is required by building codes when insulating most houses. Whether using loose fill or batts put the vapor barrier closest to the warm side of your installation where hot moist air would get in facing the house s interior in cold climates beneath floor insulation and the attic s interior in hot climates on top of floor insulation. Whether your vapor barrier is a facing or a film it must be placed on the warm in winter side of the wall.

There is a school of that maintains that an unheated garage that is attached to the house may get some benefit from insulating the walls and ceilings of the garage since it theoretically offers an additional thermal buffer. Over time this trapped moisture can rot the wood framing in your attic or cause mold and mildew to appear. Adding a second vapor barrier could cause condensation to become trapped in the insulation between the two vapor barriers. 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.

After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. A vapor barrier in an attic assembly in a severely cold climate with the absence of an air barrier will likely be ineffective. In any case the vapor barrier must point to the warm side. In reality insulation merely slows the transfer of heat through the insulated barrier wall ceiling floor etc.