Mold On Roof Trusses

This growth will cease once the moisture content drops to 19 or less.

Mold on roof trusses.

If the mold growth is thick may need to soak the trusses and plywood. Kshepard kenton shepard cmi june 18 2009 1 47am 5. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate. Water leaks and poor ventilation leading to condensation are the main roof defects which give rise to a variety of fungi moulds and insect attacks.

Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest. Mold on attic sheathing. Fungus and mold will grow on the trusses if the lumber moisture content exceeds and remains above 20. I ve seen 2x4 s come off a lumber truck from the yard looking like that.

Cleaning mold from wood trusses and cross bracing. If the wood used in trusses is kiln dried the moisture content is equal to or less than 19. Re roofing with lining lining papers sarking roofing felt can cause severe mold growth and rot due to reduced ventilation. If you ve had experience with mold and mildew in the home you know the best mildew remover is chlorine bleach.

The mold killer solution can be applied using a pressurized sprayer or for deeper penetration the fogmaster mold fogger. 20 in the host material it will not release spores. But outdoor heavy duty cleaning usually calls for more heavy duty mixtures such as tsp and chlorine bleach see the tsp page for more details or specialty additives such as jomax from rustoleum which combines a cleaner with a bleach activator. In an area of high levels of mold growth or moldy dust and debris the irregular surfaces formed by wood trusses and also by older wood cross bracing between floor joists prevents thorough cleaning of surfaces and creates many dust collection points.

Mold is a symptom of high moisture which if allowed to exist for prolonged periods can be damaging to any structure and will promote the development of wood decay fungi. The mold itself may have a cottony texture but can also be velvety leathery or. If that s mold and it looks like mold unless it s provided with enough moisture to start reproducing approx. At the south end of the roof the ridge changes direction causing an overlay condition.

A 10 x 10 area of plywood has been removed to provide air into this area. The black mold is on the first 3 truss panels. Skips a few trusses and reappears on the next panel or two. The roof has baffles at alternating thusses soffit and ridge vents.

You can effectively kill mold on wood in your attic using moldstat mold killer by soaking the mold growing on the trusses and plywood and allowing it to stay wet for at least 10 minutes then air dry.