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. Good glue coverage is essential to prevent delamination of layers. Although delamination can be caused by several factors separation often occurs as a result of improper manufacturing processes.

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

Roof plywood delamination.

The contractor thought it might have been due to excess moisture in the attic. High moisture levels break down the glue in the plywood and allow the plies to delaminate. Panel type roof sheathing may lift off the rafters in a regular pattern. Plywood is a sandwich of thin veneers glued together with heat.

Delaminations commonly affect single ply and fully adhered roofs. It was plywood and had delaminated. This winter i went up. Particularly on the roof.

Between the years of around 1964 to 1975 homes being built saw the installation of what was first generation fire retardant plywood. Like blisters delamination can come from improper installation in inclement weather. This is sometimes accompanied by buckling. One of the implications of high moisture levels from either condensation or leakage is delamination of plywood sheathing.

The causes of plywood delamination plywood anatomy. Even the best manufacturing equipment. I had my roof sheathing replaced a year ago. The more layers the better.

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

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