Attic Plywood Wet

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.

Attic plywood wet.

Buckled or damaged roof sheathing. Trapped water will boil when the sun heats the roof and the shingles will then have small pits where the. 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. 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. It is never a good idea to install a roof over wet plywood or any type of roof sheathing. The insulation was contaminated and we inspected the attic side of the ceiling drywall below for signs of leak stains or mold. Though attics are typically hot and dry a leaky roof or pipe condensation or severe weather can cause water to enter your attic.

Prolonged wetness will rot out the roof sheathing. Moisture frost and ice buildup on roofing nails. Black mold in attics. Moisture or frost on the roofs sheathing.

Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest. Reader comments q a. It s not a vapor barrier. There are many signs that an attic is wet.

Moist or wet insulation. Mold usually causes a musty odor and may cause staining that may be black brown gray white yellow or green. 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.

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. If you suspect you have moisture problems in your attic check for the following indications of excess moisture in the attic. Often this is first noticed when re shingling. Most attics are dry plywood is a smart vapor retarder with variable permeance.

The mold itself may have a cottony texture but can also be velvety leathery or.