Black Color On My Shed Roof Plywood

The top piece of plywood is exposed to the atmosphere and all those vegetation spores.

Black color on my shed roof plywood.

Exterior grade plywood is more water resistant than strand board based on my observations exposed edges or leaks cause more damage to osb than to plywood. If i just painted it would that be enough to handle the rain and sun. The reason certain panels are darker these panel have been exposed to a high concentrate of the mold spores. On my wooden shed roof its covered in black mould.

Hi i built a huge shed out of plywood which i am going to clad in shiplap or similar and i had not finished it ie it is only a plywood box at the moment with no windows or doors has an opening for double doors at one end and single door at other end to side. This also protects sheathing beneath. This usually occurs when the plywood is delivered and sets on site. When moisture condenses on plywood roof sheathing repeatedly or continuously the wood will turn black.

This can be caused by the action of fungal growth and molds and the affect they have on the tannins in the wood. The roof could be covered by a plywood sheet that is 4 x8. The roof would have a slight pitch so that rainwater shouldn t puddle on top. Shed roof plywood thickness.

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We have mild weather here in northern california so i don t need to be concerned about snow. With many colours and textures to choose from both bitumen shingles and wood cedar shingles can finish your shed roof to a high quality standard. I have heard clorox but research suggests that does not kill all mold. We know that it is important to customize your shed colors to match your house or complement the setting that your shed will be in.

This mold is not in a living space and i realize tearing off the entire roof is probably the best option even though its 14. I asked similar question before but got no response. Plywood thicknesses for roofs start at 3 8 in areas with light load requirements on rafters at 16 centers. After removing insulation the plywood dried right out and the mold appears to be dormant.