Roof Plywood Delamination

Plywood is created by gluing layers of thin veneers together and delamination occurs when these layers separate.

Roof plywood delamination.

Blows are a. If the environment is humid moisture can get trapped between the membrane and insulation. The causes of plywood delamination plywood anatomy. The contractor thought it might have been due to excess moisture in the attic.

Plywood is a sandwich of thin veneers glued together with heat. This is sometimes accompanied by buckling. Roof decking plywood delamination if you have a home twenty five years or older you may want to consider the condition of the plywood. Good glue coverage is essential to prevent delamination of layers.

Like blisters delamination can come from improper installation in inclement weather. Particularly on the roof. Between the years of around 1964 to 1975 homes being built saw the installation of what was first generation fire retardant plywood. Although delamination can be caused by several factors separation often occurs as a result of improper manufacturing processes.

The more layers the better. This winter i went up. High moisture levels break down the glue in the plywood and allow the plies to delaminate. Delaminations commonly affect single ply and fully adhered roofs.

When the membrane and insulation separate. Even the best manufacturing equipment. I had my roof sheathing replaced a year ago.