It is difficult to declare this one substance over another simply based on one s senses of sight or smell.
White marks on roof timbers.
If it were.
We describe common causes of white blotches or staining on roofs of different materials.
Infected timbers are generally brown dry and brittle with cuboidal fractures and can be crumbled by hand usually it would require 20 or more moisture content for the spores to germinate so if you have had a leak in the roof area or there is an obvious lack of ventilation to the roof void then yes this would produce an ideal enviroment for.
White stains on building roofs.
Indicates condensation increase ventilation add soffit or ridge vents apply mould cleaner treat with boracol 10rh.
Asphalt shingle wood shakes or shingles stone roofs slate roofs.
Note the roofing felt many old roofs are upgraded by installing roof lining felt this.
I found this white powder along the trusses in a home.
The white powder wipes off readily with just your hand the vertical line was created by doing this.
This article describes the causes cures for white stains or white deposits on building roofs.
If you let the mold grows it can become bigger white blotches and even into fiber like component if the mold colony grows too large.
Typical roof mould damp cold timber condensation mold growth.
The roof sheathing and trusses were dry but there is plenty of evidence that they had condensation problems prior to installing the new roof metal ridge vent the length of the house and baffles to keep the soffit vents clear.
The client will certainly expect an explanation for this white material on the roof rafters in the attic.
When you see white spots on wood they are almost certainly white mold since efflorescence cannot appear on wood.
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.
The mold usually appears first as small dust like white spots.