What Causes Dry Rot?


Dry rot
occurs when your timber has been dampened for some reason – there are two reasons for this happening:

Your house is old and was built with non-kiln dried timber. Kiln dried timber must have an average moisture content of 20% or less to be classified as such and is now compulsory for internal building work. An old home may also have clay roof tiles which do not meet current Building Regulation water permeability standards and non-British Standard materials which may or be less effective at keeping water from outside your house from entering your timber

You’ve had moisture enter your timber as a result of a damp problem

Even if your damp problem has since been solved, as mentioned above any Dry Rot that colonised whilst your timber was damp may well still be there.

Any and all of the damp problems that can affect a house can dampen your timber – examples include Rising Damp, Penetrating Damp, and damaged chimney and roof flashing.

If you haven’t had a damp problem but think you have Dry Rot, this indicates that you do have a damp problem somewhere in your house.

the area of your house affected by the rot will be a useful indicator of the type of damp problem you may be facing. Take a look at our Damp pages for more information on solving any damp issues in your home.

You must make sure that any damp issues are solved before you try and treat your Dry Rot – any treatments will become ineffective if your timber gets damp again as they will be diluted by the water, allowing the fungus to colonise again.

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