Roof Plywood Delamination

Roof decking plywood delamination if you have a home twenty five years or older you may want to consider the condition of the plywood.

Roof plywood delamination.

Delaminations commonly affect single ply and fully adhered roofs. If the environment is humid moisture can get trapped between the membrane and insulation. Good glue coverage is essential to prevent delamination of layers. Between the years of around 1964 to 1975 homes being built saw the installation of what was first generation fire retardant plywood.

Plywood is a sandwich of thin veneers glued together with heat. The contractor thought it might have been due to excess moisture in the attic. Blows are a. This is sometimes accompanied by buckling.

This winter i went up. High moisture levels break down the glue in the plywood and allow the plies to delaminate. Plywood is created by gluing layers of thin veneers together and delamination occurs when these layers separate. Although delamination can be caused by several factors separation often occurs as a result of improper manufacturing processes.

When the membrane and insulation separate. Even the best manufacturing equipment. Like blisters delamination can come from improper installation in inclement weather. The causes of plywood delamination plywood anatomy.

Particularly on the roof. Panel type roof sheathing may lift off the rafters in a regular pattern. I had my roof sheathing replaced a year ago.