I want to replace my old aluminum single panes with vinyl double hungs.
I pulled the inside molding off to reveal a rough opening of 36.75
wide, by 60.25 high.
I read that the windows (Certainteed bryn marw II)will be shipped half
an inch smaller than the rough opening.... WHY? AND what do I fill the
have inch gap with? Do I just sandwich a 1/4 inch board on each side of
the rough opening and window?
thanks for any and all help!
If you want exact size, you must specify HTS (hold to size). Do yourself a
favor and don't order exact size, rough openings are just that, rough. The
play gives you room to compensate for out-of-square openings. Specify for a
header expander, you may want to use this. It slips over the head of the
window before installing, but, make sure you lay fiberglass insulation on
the head of the window before slipping the expander over the window.
For those side areas, pack with insulation, but not to tight to bow frames
(center window in opening). Then caulk, and you can make a simple 1/2 round
to cover any gap, or really get into it and do some custom work with sill
and apron etc.
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