The contractor thought it might have been due to excess moisture in the attic.
Roof plywood delamination.
Don t interior finish until the moisture in the wood.
Photo 1 shows the exposed underside of the plywood in the attic.
With its numerous layers plywood is prone to delamination if proper manufacturing processes are not observed.
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.
If the environment is humid moisture can get trapped between the membrane and insulation.
This plywood is ordinary cdx and had not been treated with a fire retardant.
Roofing over wet plywood.
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.
Like blisters delamination can come from improper installation in inclement weather.
Most construction sites will consider the use of either osb or plywood for the roof.
I had my roof sheathing replaced a year ago.
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.
Mild or minimal delamination might not compromise the integrity of the structure.
When i step on the shingles they go down about 1 2 before they stop how critical is this if it is delaminated plywood.
Subfloor delaminated should have use advantech but you are beyond that now.
Roof decking plywood delamination if you have a home twenty five years or older you may want to consider the condition of the plywood.
What kind of plywood for the roof.
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.
It was plywood and had delaminated.
Delaminations commonly affect single ply and fully adhered roofs.
Would delaminated layer be strong enough i would notice this much resistance.
But really i don t think it s a big deal just get a dag gone roof on the thing get closed in and get some heat dehumidifier rolling in there.
When the membrane and insulation separate.
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.
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.
Cdx plywood is a construction grade type of plywood that is designed for.
