Roof Plywood Delamination

Good glue coverage is essential to prevent delamination of layers.

Roof plywood delamination.

Delaminations commonly affect single ply and fully adhered roofs. Plywood is created by gluing layers of thin veneers together and delamination occurs when these layers separate. Blows are a. When the membrane and insulation separate.

If the environment is humid moisture can get trapped between the membrane and insulation. Particularly on the roof. Roof decking plywood delamination if you have a home twenty five years or older you may want to consider the condition of the plywood. One of the implications of high moisture levels from either condensation or leakage is delamination of plywood sheathing.

Even the best manufacturing equipment. Panel type roof sheathing may lift off the rafters in a regular pattern. The causes of plywood delamination plywood anatomy. Between the years of around 1964 to 1975 homes being built saw the installation of what was first generation fire retardant plywood.

I had my roof sheathing replaced a year ago. The more layers the better. Plywood is a sandwich of thin veneers glued together with heat. Although delamination can be caused by several factors separation often occurs as a result of improper manufacturing processes.

The contractor thought it might have been due to excess moisture in the attic. This is sometimes accompanied by buckling. This winter i went up.