1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Fitted OSB board got wet.

Discussion in 'Wood / Woodwork / Carpentry' started by conny, 27 May 2021.

  1. conny

    conny

    Joined:
    30 Jun 2008
    Messages:
    13,618
    Thanks Received:
    726
    Location:
    Suffolk
    Country:
    United Kingdom
    I've laid some 8' x 4' x 9mm OSB as a sub floor for my new shed, but despite covering it with 2 layers of polythene sheeting as protection against the rain till the shed is constructed, it is showing signs of wet patches.
    If I remove the sheeting and allow it to dry out will it dry out without distorting or will it swell up like chipboard and be useless?
    I've never used OSB before so I'm not familiar with it's wet resistant properties.
     
  2. Sponsored Links
  3. foxhole

    foxhole

    Joined:
    14 Mar 2006
    Messages:
    17,484
    Thanks Received:
    2,004
    Location:
    Kent
    Country:
    United Kingdom
    It expands very slightly when wet , but I wouldn’t put any flooring down in a shed until completely watertight.
     
    • Like Like x 2
  4. conny

    conny

    Joined:
    30 Jun 2008
    Messages:
    13,618
    Thanks Received:
    726
    Location:
    Suffolk
    Country:
    United Kingdom
    Just an update on this. What I thought was a wet area on the OSB turned out to be a patch of condensation between the double layer of polythene sheeting!
    Took the polythene off yesterday and the OSB was completely dry. It is now covered with a thick, single layer, tarpaulin with plenty of overhang all round and the edges weighted down with bricks, blocks and lengths of timber. Should keep it perfectly dry until new shed arrives.
     
Loading...

Share This Page