White Stains On Roof Trusses

The client will certainly expect an explanation for this white material on the roof rafters in the attic.

White stains on roof trusses.

The attic is basically a crawl space with loose insulation between the ceiling joists. I found approximately 10 percent of the roof rafters covered in spots with a white powdery substance which i assumed to be mold. On 2019 10 09 mod what is this white moldy stuff in my attic. Here is a diagnostic guide to types of stains and staining materials found on roof surfaces black red green brown or other coloured stains on asphalt roof shingles or on other roofing materials need first an accurate diagnosis of the stain cause and then proper steps to remove the stain or to prevent future staining on roof shingles surfaces.

Note the roofing felt many old roofs are upgraded by installing roof lining felt this. After all some mold shows up as a white powdery material but more often in a crawl space than an attic. After reading your article regarding mold i checked out my 36 year old home and found very little except in the attic. The insulation was contaminated and we inspected the attic side of the ceiling drywall below for signs of leak stains or mold.

The area can be cleaned and treated with oxalic acid to prevent rust. Bill that could indeed be and looks like a white fungus or mold growth on roof sheathing. Mould white blue or black spots on timber lining felt masonry. Indicates condensation increase ventilation add soffit or ridge vents apply mould cleaner treat with boracol 10rh.

Typical roof mould damp cold timber condensation mold growth. White stains on slate roofs efflorescence or salt stains from rain water sometimes appear on slate shingles.