Roof Plywood Delamination

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

Roof plywood delamination.

Even the best manufacturing equipment. Delaminations commonly affect single ply and fully adhered roofs. Roof decking plywood delamination if you have a home twenty five years or older you may want to consider the condition of the plywood. 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. One of the implications of high moisture levels from either condensation or leakage is delamination of plywood sheathing. Although delamination can be caused by several factors separation often occurs as a result of improper manufacturing processes. Plywood is created by gluing layers of thin veneers together and delamination occurs when these layers separate.

Good glue coverage is essential to prevent delamination of layers. This winter i went up. The more layers the better. The causes of plywood delamination plywood anatomy.

It was plywood and had delaminated. 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. This is sometimes accompanied by buckling.

Plywood is a sandwich of thin veneers glued together with heat. Blows are a. Between the years of around 1964 to 1975 homes being built saw the installation of what was first generation fire retardant plywood.