• As part the works in my place, i'm getting a window knocked through into a big patio door. It'll be about 280cm high, which is too high for a door. So I'm getting a door and a transom window above.

    My builder wants to just bolt the two (timber) frames on to each other and fit them like that. The window company is advising a mullion or transom going horizontally across to sit between the door and the window above. They say it's harder to seal the gap against draughts if it is just two frames joined up.

    Anyone else have experience of this?

  • The optimal solution depends on which window/door products you’re looking to use, and how the two elements will interface.

    I’d say that ‘bolting the two together’ does sound like a bodge, although airtightness can be easily achieved by using correct gaskets/expanding foam tape.

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