Roof Plywood Delamination

The more layers the better.

Roof plywood delamination.

Between the years of around 1964 to 1975 homes being built saw the installation of what was first generation fire retardant plywood. The contractor thought it might have been due to excess moisture in the attic. Particularly on the roof. It was plywood and had delaminated.

Delaminations commonly affect single ply and fully adhered roofs. Panel type roof sheathing may lift off the rafters in a regular pattern. Blows are a. This is sometimes accompanied by buckling.

Plywood is created by gluing layers of thin veneers together and delamination occurs when these layers separate. I had my roof sheathing replaced a year ago. Although delamination can be caused by several factors separation often occurs as a result of improper manufacturing processes. Like blisters delamination can come from improper installation in inclement weather.

When the membrane and insulation separate. 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. If the environment is humid moisture can get trapped between the membrane and insulation.

Even the best manufacturing equipment. The causes of plywood delamination plywood anatomy. Roof decking plywood delamination if you have a home twenty five years or older you may want to consider the condition of the plywood.