What Are The Signs Of Dry Rot?

What Are The Signs of Dry Rot?

Dry rot is one of the most serious types of timber decay and, if left untreated, can cause major structural issues in your home. Caused by a fungus called Serpula lacrymans, dry rot thrives in damp, poorly ventilated areas and can spread quickly through timber, plaster, and even masonry. So how can you tell if your property is affected?

Here are some of the most common signs to look out for:

1. Musty, Damp Smell

One of the first things people notice is a persistent, musty odour—often stronger in areas like basements, cellars, or behind skirting boards. It’s a telltale sign that moisture is present and conditions are ripe for dry rot.

2. Discoloured or Brittle Timber

Timber affected by dry rot often becomes darker in colour and may feel brittle or crumbly to the touch. You might see cracks running across the grain or notice wood that breaks apart easily under light pressure.

3. Fungal Growth

As the rot develops, you may see a white or grey cotton wool-like substance on timber surfaces. In more advanced stages, a thick, mushroom-like fruiting body may appear, often with a rusty-red spore dust surrounding it.

4. Warped or Shrinking Wood

Another sign of dry rot is timber that has shrunk, warped, or appears to be pulling away from the wall. This can be due to the loss of moisture and structural integrity as the fungus feeds on the wood.

5. Paint Peeling or Bubbling

In some cases, dry rot may not be immediately visible, especially if it’s hidden behind painted surfaces. However, bubbling or flaking paint—especially on skirting boards or window sills—can be an early warning sign.

6. Fine Orange or Rust-Coloured Dust

This is the spore dust released by the fruiting body of the fungus. If you see this kind of dust around timber or masonry, it could be an indication that dry rot is active and spreading.

Don’t Ignore the Signs

Dry rot can cause serious damage if not tackled early. If you suspect it in your property, it’s important to get a professional survey as soon as possible. At Surrey Damp Experts, we offer thorough inspections and expert treatment plans to stop the rot at its source.