black patches on roof timber Damp can be a major issue in the home. Find answers to questions or post your own here.

[roseflower]

Hi does anyone know what black patches on a roof timber are? They seem dry not flacky or mouldy but have spread, tomber seems solid no smell either. Near to some lead flashing. No sign off water penetration. Do I need to treat before they get worse. Any ideas thanks

[Perry525]

You may have mould.
Mould comes in many colours.
The colour depends on what its growing on.
Buy a damp meter.