Roof Plywood Delamination

When it comes to choosing what kind of plywood you need for the roof it is important to understand the basic categories that you can choose from.

Roof plywood delamination. Cdx plywood is a construction grade type of plywood that is designed for. As a homeowner if you find yourself in this position know that when you install a new decking system you will have to decide between using plywood or osb. It was plywood and had delaminated. Roofing over wet plywood.

Most construction sites will consider the use of either osb or plywood for the roof. This winter i went up. Subfloor delaminated should have use advantech but you are beyond that now. This plywood is ordinary cdx and had not been treated with a fire retardant.

The contractor thought it might have been due to excess moisture in the attic. When the membrane and insulation separate. Photo 1 shows the exposed underside of the plywood in the attic. I had my roof sheathing replaced a year ago.

I figure im about 6 yrs away from a new roof and this one was a tear off and its tampko old english peweter acrh shingles. Like blisters delamination can come from improper installation in inclement weather. It will dry to the inside. Roof decking plywood delamination if you have a home twenty five years or older you may want to consider the condition of the plywood.

Between the years of around 1964 to 1975 homes being built saw the installation of what was first generation fire retardant plywood. If the environment is humid moisture can get trapped between the membrane and insulation. With its numerous layers plywood is prone to delamination if proper manufacturing processes are not observed. The plywood is delaminated and beginning to fall apart.

Mild or minimal delamination might not compromise the integrity of the structure. Builders expect a small degree of delamination and they make provisions for it by spacing plywood sheets 1 8 inch apart when installing boxing on the exterior of the house or sheathing on the roof. Delaminations commonly affect single ply and fully adhered roofs. Other plywood separations can be blamed on mistreatment of the plywood or failure to practice good woodworking techniques.

Particularly on the roof. When i step on the shingles they go down about 1 2 before they stop how critical is this if it is delaminated plywood. Don t interior finish until the moisture in the wood. According to dmitry lipinskiy owner of roofing insights there is a 5 chance that older homes will need a completely new decking system when their roofs are repaired.