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Window sizing

| Posted in General Discussion on March 4, 2001 09:38am

*
G’day. I received some valuable feedback with regards to the installation of a window; however, I’m at a point were another question has arisen. I’m installing the window in a location were no window existed before. I’ve framed in the rough opening and cut out the exterior sheathing and siding. The window I’m installing is PVC with 1 1/2″ brickmold. The wall is 2×6 construction. The manufacturer of the window is adding a jam extension for a total window thickness of 6 1/2″. He said this is standard for 2×6 construction. The problem is that things don’t add up when I calculate everything in. 2×6(5 1/2″) + 1/2″ gyproc + 3/8″ exterior sheathing = 6 3/8″. Is it standard practice to have the total thickness(depth) a little larger? Thank you.

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  1. Allyson_Stiles | Mar 04, 2001 07:52pm | #1

    *
    It should stick out flush with your drywall surface so that trim sits flat on it and the wall. If they're not making it that way, I would just buy the window, set it in, and make my own jamb extensions.

    Billy

    1. Joseph_Fusco | Mar 04, 2001 07:58pm | #2

      *Mike,

      If it had to be anyway, it's better a little (1/8") past the drywall then 1/8" in (short). You might find that in some places this extra 1/8" was just right.

      View Image © 1999-2001"The first step towards vice is to shroud innocent actions in mystery, and whoever likes to conceal something sooner or later has reason to conceal it." Aristotle

      1. Ryan_C | Mar 04, 2001 07:59pm | #3

        *With 1/2" sheathing, it would work out. But there's no point in talking about 1/2" being standard for wall sheathing now.If the window's already ordered, I'd shim the outside with 1/8" lath, and make sure you've caulked and flashed to get it weather and wind tight. Actually, 1/8" isn't that bad. Your sheathing and drywall will be alittle wavy anyway.

        1. davidmason | Mar 04, 2001 09:28pm | #4

          *Did you figure in vapor barrier and acoustical sealant? That could add up to 1/8.If not then you could cut your trim so that the front touches before the back does. You'll need to shim your trim before you cut it or set your compound miter off a degree or two. Good Luck,Dave p. s. Just reread your post and seen the 3/8" ex. sheathing, therefore forget what I said and use Ryan's lathe idea. Sorry for any confusion this may have caused : ) , Dave

  2. Mike_Scidmore | Mar 04, 2001 09:38pm | #5

    *
    G'day. I received some valuable feedback with regards to the installation of a window; however, I'm at a point were another question has arisen. I'm installing the window in a location were no window existed before. I've framed in the rough opening and cut out the exterior sheathing and siding. The window I'm installing is PVC with 1 1/2" brickmold. The wall is 2x6 construction. The manufacturer of the window is adding a jam extension for a total window thickness of 6 1/2". He said this is standard for 2x6 construction. The problem is that things don't add up when I calculate everything in. 2x6(5 1/2") + 1/2" gyproc + 3/8" exterior sheathing = 6 3/8". Is it standard practice to have the total thickness(depth) a little larger? Thank you.

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