Because wood is porous, it may be difficult to remove the mold stains from the sheathing, but you can kill the mold by cleaning the sheathing with bleach and water. Mold growth in the attic is a common occurrence. Homeowners rarely visit the attic, which allows the mold colonies to flourish undetected. Attic plywood, which is mainly utilized as flooring, can develop mold infestations.

Attics are one of the most common areas of mold growth in the home. Attics tend to have the perfect conditions for mold growth (hot, humid, and an abundant food source with the wood sheathing).

Furthermore, most homeowners don’t ever go up in their attic, so the mold problem is allowed to grow undisturbed often for years. However, getting rid of attic mold, especially when it grows on plywood, is a tricky endeavor that most homeowners aren’t equipped to handle themselves. Attic mold can impact indoor air quality and your family’s health, making its removal a top priority.

Why does mold grow in the attic?

Attics are ideal places that mold growth, it\’s often left unused, they are hot, and humid, and contain abundant organic food sources which as wood sheathing. Mold requires moisture, oxygen, and a food source to grow; and, the attic provides all three forms of nutrients.

The moisture issues that cause mold growth in the attic may be attributed to any of three scenarios: insufficient or blocked ventilation, roof issues or leaks, and the incorrect exhaustion of bathroom fans or dryer vents. If the attic were moisture-free, mold spores would have no chance of surviving.

The ventilation system in the attic normally works by allowing outside air to enter through the soffit vents and escape through the top ridge vents. When the vents are blocked with insulation, however, the warm outside air will stagnate inside, condense on wood, and allow mold to develop.

Roof leaks can lead to localized mold growth. The roof should be examined periodically for leaks. Dryer exhaust vents are designed to direct moisture outside the home. Homeowners must ensure the vents lead outdoors and not into the attic, where moisture and mold problems can begin.

What are the signs of an attic mold problem?

A hot, stuffy attic will attract mold spores. The lack of proper ventilation is the prime cause of stuffiness inside the attic. A well-ventilated attic should feel breezy. Also, when a homeowner is confronted with the smell of mildew in the attic, it is a sign of a moisture problem.

Black, discolored wood is an indication of mold growth. Wet attic insulation can lead to an eventual mold problem (moisture also diminishes its ability to insulate). In winter, frost buildup on the underside of the roof sheathing is another telltale sign of impending mold.

• Dark stains: If your attic plywood has dark stains or black colorations where it\’s clear that the problem has moved beyond just moisture, it\’s likely a mold.
• Hot and stuffy attic: Ideally, your attic should be cool and well-ventilated. If it’s starting to feel stuffy and hot, that’s a sign of poor ventilation, which frequently causes mold.
• Frost buildup on roof sheathing: During the winter, improper ventilation can cause water vapor underneath your roof to freeze. In time, this frost buildup will cause mold.
• The smell of mildew: If you perceive a musty smell or moldy surface in your attic, it\’s a great sign of mold in your attic.
• Wet insulation: If your attic insulation is getting damp, it’s a surefire sign that your attic is far too moist and mold might already exist. It also damages the insulation, increasing the chance of mold in the future.

What causes attic mold?

Generally speaking, if you have a mold problem, you most likely have a moisture problem. If your attic plywood is accruing mold, you first need to address the moisture in your attic. This issue is often caused by poor ventilation, air leakages, and roof leaks.

• Blocked ventilation: Attics usually have a passive ventilation system that lets outside air come through soffit vents and then leaves through the can or ridge vents on the top of the roof. However, if one of these mechanisms becomes blocked, it disrupts the entire system. Warm air stagnates in the attic and then condenses with the cold wood sheathings in the attic. This creates moisture, leading to mold.

• Air leaks: In leaky homes, the air that’s driven by exhaust fans or the wind can blow through ceilings and attic floors. Because this air often contains water vapor, large-scale air leaks can cause condensation, which leads to mold on your attic plywood.

• Roof leaks: Roof leaks will cause mold to form in specific areas of your attic. Check for any wood discoloration and roof valleys. Chimneys, vents, or anywhere else in which dissimilar materials join together are where roof leaks typically occur.

How to eliminate mold from attic plywood?

Removing mold from your attic plywood is what you can do by yourself except if it is much larger, then you will call a professional to remove it.

(1) Using a wet vacuum or spray

This is used for small removal projects. If you have mold on your attic plywood in small areas, you can remove it yourself so long as it’s collecting in a small area (up to 10 square feet).

Some of the safety precautions for mold removal are

• Wear old clothes and shoes that you can launder or throw away after the cleanup work.
• Wear special N-95 or P-100 respirators, in addition to goggles and gloves.
• Set an old box fan or a cheap new one in a window to ventilate the room while working.
• Wrap and tape moldy contaminants in 6-mm plastic, and double-bag mold-infested debris in garbage bags for disposal.
• To control airborne spores, moisten moldy areas with a garden sprayer while you work.

You can get rid of mold-contaminated wooden surfaces using a wet vacuum that can fill its tank partially with water to control mold residue. Wipe the surface with a damp sponge or cloth that’s been treated with clean water or wood cleaner.

(2) VacMaster Pro HEPA filtration wet/dry vac

The Vacmaster Pro is a certified HEPA system & has an ultra-quiet 2-stage industrial motor. It features 4 levels of filtration including a HEPA Cartridge filter, microfiber pre-filter, high-efficiency fine dust filter bag with closure flap, & an exhaust filter-all for HEPA compliance.

Beyond using this vacuum to remove mold from your attic, you’ll find it convenient for cleaning floors, curtains, and other areas that collect a lot of dust and debris on a day-to-day basis.

(3) A professional mold remediation company

For larger removal projects, it\’s advisable to hire a professional mold remediation company. Attic mold removal is no walk-in the park for any homeowner. Not only does the possibility of falling through the attic floor make it an extremely dangerous undertaking, but you’ll also need to purchase plenty of expensive equipment to pull it off.

Because mold presents serious health concerns while also damaging your home’s overall energy efficiency, we believe this is a job you shouldn’t have to gamble on. If you hire a professional, you can give you and your family peace of mind knowing that the mold was assessed correctly and removed from your attic plywood using the right methods