How To Seal An Attic Vapor Barrier

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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.

How to seal an attic vapor barrier.

Most forms of attic insulation benefit from the addition of a vapor barrier to protect them from the harmful effects of moisture which can reduce their effectiveness over time the following are a few simple steps to help you undertake the task properly so your vapor barrier retains heat without damaging the insulation. The paper facing contains a layer of impermeable asphalt that prevents water vapor from passing through it. To be extra certain use a caulk gun to place caulk material around the tape to double seal the barrier. Cut 1 3 boards to fit the perimeter of the opening and nail them on with 6d finish nails.

Attic vapor barrier detail for cold climates. Weatherstrip the attic access hatch or door. During the energy crisis of the 1970s a prevailing belief took root where it was thought that tightly sealing walls and ceilings with a vapor barrier was essential to blocking heat transference and reducing energy costs it was soon determined however that unless the seal was absolute moisture that did get into sealed walls could create serious structural problems and health issues such as. Even though we apply vapor barriers to exterior insulated walls in cold climates it s no longer recommended for ceilings floor of the attic.

Using other kinds of tape will compromise the waterproof seal and render the barrier useless. Seal the attic access. Because it s nearly impossible to seal penetrations in the ceiling the reality is water vapor will get into the attic. If you re insulating from scratch put the right vapor barrier in the right place.

Apply self adhesive foam weatherstrip tape to the top edge of the stop. Finish the wall within a month of installing the barrier to prevent damage to the surface and protect the vapor barrier. Though some batts come with a paper or foil facing that can act as a vapor barrier tom silva prefers to use 6 mil polyethylene sheeting cut to fit between the joists and with seams sealed by foil tape to prevent moisture from seeping into insulation. How to use plastic as a vapor barrier in the walls.

In any case the vapor barrier must point to the warm side. Vapor barriers are sheets of plastic or other material placed on one side of insulation sheets. Think of a glass of ice water. Water vapor in the warmer air of your home begins to condense on the colder surface of the glass of water.

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