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How to retro fit aluminium sliding window to shed extension

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  1. #1
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    Default How to retro fit aluminium sliding window to shed extension

    I am extending an old garden shed using 50x50 RHS as the posts and 100x50 “groove tube” as the rails. I have an old aluminium sliding window in good condition - it has no reveals and all I have is the aluminium window. The window has the “flange” ? or weatherproof metal strip as part of the window and I assume this part sits up against the internal part of the shed.
    My question is, does the window need to be “framed” with a timber reveal ? Before it can be installed ? And does the window need another aluminium or colorbond flashing around the top of the window to stop the rain running down the cladding and along the top sill of the window ? Looked on YouTube, but only found US “look how smart I am” videos with no verbal instructions.
    Can anyone help please who has done this before ?

  2. #2
    Resigned SilentButDeadly's Avatar
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    Default How to retro fit aluminium sliding window to shed extension

    Yes. Yes. And...yes.
    Joined RF in 2006...Resigned in 2020.

  3. #3
    Senior Member
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    Western Australia
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    Default

    Make a steel frame and install window into.
    Flashing above the window is a good idea and normally done.
    You can butt the tin up to the edge of the window on the sides or use a "c" channel strip if you want it neater to hide cut.

  4. #4
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    Default

    doovalacky. Thanks for your advice. unfortunately “Silentbutdeadlys” advice should have been No, No and Yes. The window is now in. The window did not need a reveal around it to fit, but would have been “prettier” with one. I ran a length of closed cell foam along the “groove tube” sill and then sat the frame on that before fixing. I ran two lengths of 50 x 50 RHS up each side as my frame. The flange sits up against to outer frame of the sill and not the inside, otherwise it wouldn’t be weatherproof. But yes, above the window needs flashing and an infill. I will get a section of C channel strip to tidy things up. Thanks for your help.

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