Do I Need A Vapor Barrier In My Attic

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

Do i need a vapor barrier in my attic.

Attic vapor barrier detail for cold climates even though we apply vapor barriers to exterior insulated walls in cold climates it s no longer recommended for ceilings floor of the attic. In hot dry climates your attic can be vented though like in hot humid climates you should not install any vapor retarder or barrier. Not every wall does. Because it s nearly impossible to seal penetrations in the ceiling the reality is water vapor will get into the attic.

Hi beth do not add a vapor barrier on top of the insulation in your attic since the paper facing on the existing insulation is the vapor barrier. No you don t need a vapor retarder class i or otherwise. However all attics vented or unvented and in all climates should have an air barrier such as an airtight drywall ceiling. Avoid adding interior vapor barriers where the outer wall construction already includes a material with vapor barrier properties.

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. In areas with high humidity such as greenhouses rooms with spas or swimming pools and bathrooms vapor barriers are often recommended. A vapor barrier in an attic assembly in a severely cold climate with the absence of an air barrier will likely be ineffective. Most authorities recommend vapor barriers in certain situations.

Seal the air leakage pathways. You have loose fill insulation in the attic which doesn t have a vapor barrier. The paper facing contains a layer of impermeable asphalt that prevents water vapor from passing through it. The theory is that part of the moisture vapor in the house is actually blocked by the drywall and paint on the.