Roof Plywood Delamination

This winter i went up.

Roof plywood delamination.

This is sometimes accompanied by buckling. Particularly on the roof. Delaminations commonly affect single ply and fully adhered roofs. Good glue coverage is essential to prevent delamination of layers.

The contractor thought it might have been due to excess moisture in the attic. Panel type roof sheathing may lift off the rafters in a regular pattern. Even the best manufacturing equipment. High moisture levels break down the glue in the plywood and allow the plies to delaminate.

Like blisters delamination can come from improper installation in inclement weather. Between the years of around 1964 to 1975 homes being built saw the installation of what was first generation fire retardant plywood. It was plywood and had delaminated. If the environment is humid moisture can get trapped between the membrane and insulation.

Although delamination can be caused by several factors separation often occurs as a result of improper manufacturing processes. Blows are a. The causes of plywood delamination plywood anatomy. I had my roof sheathing replaced a year ago.

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