Roof Plywood Delamination

This winter i went up.

Roof plywood delamination.

The more layers the better. Like blisters delamination can come from improper installation in inclement weather. When the membrane and insulation separate. Particularly on the roof.

It was plywood and had delaminated. One of the implications of high moisture levels from either condensation or leakage is delamination of plywood sheathing. Plywood is a sandwich of thin veneers glued together with heat. Good glue coverage is essential to prevent delamination of layers.

Even the best manufacturing equipment. This is sometimes accompanied by buckling. If the environment is humid moisture can get trapped between the membrane and insulation. Blows are a.

The contractor thought it might have been due to excess moisture in the attic. Roof decking plywood delamination if you have a home twenty five years or older you may want to consider the condition of the plywood. Between the years of around 1964 to 1975 homes being built saw the installation of what was first generation fire retardant plywood. Plywood is created by gluing layers of thin veneers together and delamination occurs when these layers separate.

High moisture levels break down the glue in the plywood and allow the plies to delaminate. I had my roof sheathing replaced a year ago. The causes of plywood delamination plywood anatomy.