"Set Square" wrote in message
...

Are the joists wet? What is supporting them? Is it possible that there's a
sleeper wall under the joists which doesn't have a proper DPC?
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Cheers,
Set Square
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You are spot on! The joists are wet and they do appear to be supported on a
sleeper wall. How should I damp proof this? Can I lay a damp proof
membrane directly under the joists?

Thanks,

Graham.