Attic Plywood Wet
Buckled or damaged roof sheathing.
Attic plywood wet. The mold itself may have a cottony texture but can also be velvety leathery or. Water or drip marks scattered on the attic floor. Black mold in attics. Most attics are dry plywood is a smart vapor retarder with variable permeance.
Mold usually causes a musty odor and may cause staining that may be black brown gray white yellow or green. If any moisture makes its way to the plywood the damp plywood will dry out on hot sunny days. Reader comments q a. Though attics are typically hot and dry a leaky roof or pipe condensation or severe weather can cause water to enter your attic.
Moisture frost and ice buildup on roofing nails. Water in your attic can damage wood beams insulation and even. If your insulation particularly the cellulose on top is uniformly damp over much of the area then pretty certain it is condensation or frost forming which is not uncommon at all even in ventilated attics when the outside temp gets below about 15 or so. If you have ceiling leaks only in the spring it may be that ice has been forming on the sheathing all winter and it suddenly melts when a warm spell arrives.
Trapped water will boil when the sun heats the roof and the shingles will then have small pits where the. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate. Wet sheathing was found in attic area due to lack of venting. Moist or wet insulation.
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. Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest. Often this is first noticed when re shingling. Moisture or frost on the roofs sheathing.
It s not a vapor barrier. The insulation was contaminated and we inspected the attic side of the ceiling drywall below for signs of leak stains or mold. In the vast majority of cases the mold growth is caused by condensation. It is never a good idea to install a roof over wet plywood or any type of roof sheathing.
Prolonged wetness will rot out the roof sheathing.