expansion gaps on windows

Discussion in 'Builders' Talk' started by clueless jon, Sep 14, 2009.

  1. clueless jon

    clueless jon New Member

    HI, can anyone tell me, when building in a window, is it necessary to leave a 5mm expansion gap around it or can i just build right up tight to it? it's a wooden window going into stone . thanks in advance
  2. Mr GrimNasty

    Mr GrimNasty Active Member

    Wouldn't bother, UPVC expands about 10 times as much as wood and <u>is</u> quite significant, but wood is negligible.
  3. flippin heck

    flippin heck New Member

    A small gap of a few millimetres all round will allow a better external seal to be achieved between the frame and stonework. What you should be aware of is that a vertical DPC should be present between the frame and stonework, as moisture could travel from the stonework (or mortar) to the timber frame where they are in contact.
    Hope this helps
  4. clueless jon

    clueless jon New Member

    thanks. very good. will do

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