Attic Plywood Wet

2 layers of shingles. Plywood is original 49 years old. Most attics are dry plywood is a smart vapor retarder with variable permeance.

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Quite often the roof flashing is defective and needs replacement.

Attic plywood wet.

As i m sure you know building codes require this type of attic to be vented. Inner plywood of roof wet. Wet sheathing was found in attic area due to lack of venting. If the sheathing either boards plywood or composite board along the lower edge of the roof is soaked and you can see a corresponding accumulation of ice on top of the roof ice damming is occurring.

The black attic mold shown here confirms that this attic had a serious venting and moisture problem including moisture from sources lower in the building. Even if conditions are conducive to mold growth elevated moisture plywood made from a fungal resistant wood will resist mold growth for quite a while. Wanted to add more cellulose but installer said it would make wet roof worse. Attic venting attic moisture and ice dams.

It s not a vapor barrier. Some woods are much more resistant to rot and fungal attacks. If any moisture makes its way to the plywood the damp plywood will dry out on hot sunny days. The attic vents provide a secondary method to help everything.

Attic insulation combination of fiberglass covered by cellulose. Not wet but some areas slightly damp. The second variable is the species of wood used in the plywood. In this photo of very dark mold in an attic in a wet attic mold which we found to be brown in the microscope looked black on the plywood.

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