Attic Plywood Wet

It s not a vapor barrier.

Attic plywood wet.

Though attics are typically hot and dry a leaky roof or pipe condensation or severe weather can cause water to enter your attic. The insulation was contaminated and we inspected the attic side of the ceiling drywall below for signs of leak stains or mold. 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.

Mold usually causes a musty odor and may cause staining that may be black brown gray white yellow or green. In the vast majority of cases the mold growth is caused by condensation. Water or drip marks scattered on the attic floor. There are many signs that an attic is wet.

Moisture frost and ice buildup on roofing nails. Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest. 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.

It is never a good idea to install a roof over wet plywood or any type of roof sheathing. Moisture or frost on the roofs sheathing. Black mold in attics. Most attics are dry plywood is a smart vapor retarder with variable permeance.

If you suspect you have moisture problems in your attic check for the following indications of excess moisture in the attic. 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. Buckled or damaged roof sheathing. If any moisture makes its way to the plywood the damp plywood will dry out on hot sunny days.

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. Often this is first noticed when re shingling. Moist or wet insulation. The mold itself may have a cottony texture but can also be velvety leathery or.

Wet sheathing was found in attic area due to lack of venting.