Small holes on underside of floorboard

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I live in a 1930s semi.Recently I went under the floorboards into a 3ft.cavity to lay some wiring. I noticed that the underside of the floorboards were pitted with small holes (like a dartboard),however these are not noticeable on the upperside. Can anyone explain what has caused this.
 
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dennisb66 said:
I live in a 1930s semi.Recently I went under the floorboards into a 3ft.cavity to lay some wiring. I noticed that the underside of the floorboards were pitted with small holes (like a dartboard),however these are not noticeable on the upperside. Can anyone explain what has caused this.

Sounds like woodworm. It could be that the timber has been treated (Eradicure or something like that) but the treatment didn't penetrate the cavity hence worm on the underside. I had similar problems at my old house which was apparantly fully treated.
Having said that it may not mean they are still active - they could have been there prior to the treatment in which case there isn't a problem. Look for small patches of whatlooks like sawdust under the holes difficult to spot I grant you but if there they are still alive and will need to be treated.
 

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