White powder substance under floorbards

28 Nov 2012
Reaction score
United Kingdom
I have been under the floorboards of my bungalow and I noticed on some of them is a bright white powder on the surface, it wipes off and the wood looks normal.
Any need to worry ?
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So this white powder is stuck on the underside of the boards. I think I have seen this on wood that has been damp, even though its now dry. Could this be the case, washing the floor boards? Its not wood worm is it?
Yes the boards have been wet due to a leaking pipe, they are now dry however there is an odd board also effected that as far as I know has not been wet.

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