This home in Fairbanks, Alaska was built in the mid 80’s when the cost heating oil was not even considered an issue. As a result many homes in Fairbanks, Alaska have a poor or non-existent vapor barrier. There are some solutions to improve or replace the vapor barrier in an old home. Here we see what I did to add a vapor barrier to an old roof.
The attic crawl space had some visqueen but it was not properly sealed so really did not provide a vapor barrier. The VB Doctor is seen here placing a new VB layer and sealing it with black death. After the new VB was installed in the attic space, we put 5/8″ sheet rock up to fire protection and to provide a backer for the spray foam.
Both sides of the roof were sprayed and filled with 1 1/2″ of foam insulation the provide a vapor barrier and increased insulation. We hammer tacked the visqueen to the sheet rock so the heat created by the foam did not create bubbles in the plastic which would reduce the r-value of the insulation.
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Straight Ahead Construction, llc is a Fairbanks, Alaska roofing contractor.
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