Freeman Dawson & Co Ltd

Timber Decay, Timber Infestation and Rising Damp Specialists

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Types of damp

Dry Rot in buildings can be a serious problem as the fungus has the ability to spread secretly within the fabric of a building in its search for timber resulting in structural damage. Dampness in some form is necessary to initiate an attack so all sources of dampness within buildings should be identified and cured as quickly as possible.

Wet Rots on the other hand although causing decay in timbers that become regularly or permanently damp do not travel through masonry remaining within the original area of dampness.

Dampness in buildings is probably the most misdiagnosed problem. Condensation when water condenses out of a warm moist air on contact with cold surfaces can affect readings taken with a moisture meter. It occurs when relative humidity is high and is not always confined to the winter months. An example of an instrument which can show whether or not Rising Dampness is occurring in a wall is a Speedy moisture meter which measures the free moisture content in masonry. Other moisture meters when used on the plaster surface are only an indication of some form of contamination in the plaster, not necessarily as a result of moisture rising in the wall.


Freeman Dawson & Company Ltd 2000