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Fungal Decay – Wet Rot and Dry Rot

Every building is under threat from fungal decay which can cause problems in structural integrity.
Although quite different, Wet Rot and Dry Rot are both extremely dangerous.
Premier Contractors’ Surveyors are experts in identifying and treating both kinds.

Both Wet Rot and Dry Rot are types of fungal decay and the first, and very important task, is to identify correctly which problem a building is facing.

There are many different types of Wet Rot but only one Dry Rot fungus. Premier Contractors are experts in identifying the difference and implementing the correct treatment to effect eradication of the problem.

One of the main differences is that wet rot needs a higher moisture content to grow. Wet rot likes to grow on timber with a high moisture content of around 50% and above while dry rot will germinate at a lower timber moisture content of around 20% to 30%.

Both types feed on the wood they infest, weakening the structure and, ultimately, causing it to collapse.


wet rot

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Wet rot is often a result of defective plumbing, gutters, downpipes or stone pointing.

Fortunately, wet rot does not spread through masonry and its growth will cease when the moisture is removed.

What to look for:
> Mycelium strands may appear on the timber
> Timber shrinkage and cracks to the timber
> Timber is likely to feel soft and spongy to touch
> Discolouration of timber may appear
> The Rot will stay within the damp area and does not spread


dry rot

dry_rot_inset_360x360

A major, and important, difference between the two is that dry rot will often occur in areas of the property that cannot be seen. Significant damage might occur before the problem is identified.

These are often areas such attics or underfloor areas that have poor ventilation, resulting in a higher-than-normal moisture content. Excessive condensation on windows can sometimes be an early warning sign of dry rot.

Dry rot can travel through and along the wall surface behind plaster or render, and it is recommended that plaster and wall coverings be stripped back in all directions until the last known affected areas are found and beyond, then the whole areas are treated.

Identifying Dry Rot
> A white mycelium growth like cotton wool appears when fresh
> The mycelium can have a lemon-yellowish tinge
> The mycelium turns to grey when older
> The timber will usually have large cuboidal cracking and crumble when badly affected
> Damp musty smell
> Red spore dust from the fruiting body is evident in rooms.
> Paint finish can appear damaged.

We offer a comprehensive 10-year guarantee backed by GPI insurance on all our projects.

What to do next if you have Dry Rot or Wet Rot.
Do not delay. Find out more. Book a free, no obligation survey below or call us on 0800 246 1548.

fungal decay - case studies

TO FIND OUT MORE, BOOK A FREE, NO OBLIGATION SURVEY OR CALL US TODAY ON 0800 246 1548