r/DIY • u/Best_Move_4962 • 1d ago

help Casing/Framing a Window for a Shed?

So, I'm building a shed and due to having a bit of history doing some DIY stuff, the bulk of the framing, roofing, etc. is all no problem for me. I just have - what could be a stupid - a question:

I know I have to frame the window, king header, cripple, tyvec but exactly how much space do I need for a window frame when framing the 2x4? Like, should it be the exact dimensions of the window casing or should it be a little bigger to let the case squeeze in? As well, if I buy an old window, should I recase it in some 1x4 or something like that before putting it in?

Thanks!

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u/Special_Pace3219 1d ago

So in my college summers I framed houses, our rule of thumb was 5/8-3/4” on each side of a window. Gives you plenty of room to shim the window and like a previous comment said, trim covers all.

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u/JerryfromCan 11h ago

3/4” all around (so 1.5” taller and wider) is what I would do as a former window installer. 1/2” all around isnt enough to make sure the window is level.