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Damp joist why and what can I do about it?

UPDATE have now finally checked the cavity in 4 places. It's clear except for poly beads, couldn't get fingers inside so stuck a piece of corrugated card in, no signs of moisture at all ;)

So what I can see must be a preserver as some have speculated.

Thanks all for your help.
 
Good advice but the mods are watching and have removed a load of nonsense replies;)
 

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