Installing a window in a freshly framed opportunity is one of the more easy tasks in a construction project.
Most new construction windows have what is called a nailing fin. These are found on vinyl or aluminum clad windows. This nailing fin is whether vinyl or metal and has nail holes every 4 to 6 inches and about 1 and 1/2 inches wide. Nailing fins take the place of brick moulding which can still be found on primed wooden windows.
Window Moldings
Not only do these fins make premise easier, but also make a best seal against water and air infiltration. These windows can be flashed if desired but not deemed necessary. A window that does not have the benefit of a soffit or porch roof above it may need flashing or a drip edge above it.
When getting ready to setup a window, make sure the sheathing is not hanging into the rough opening. This could cut down the size of the opportunity and not let the window go into the opening. Once this is done, measure the rough opportunity to make sure the it is big sufficient for the window. You don't want to lift a heavy window to an opportunity only to find it won't fit. Rough openings are commonly 1" wider and 1/2" taller than the window unit. Rough openings are spect and provided by the window manufacturer.
Depending on the size of the window, you'll need 2 or 3 citizen to setup a window. One or two outside and one inside.
Once you know the window fits, lift it to the opportunity from the outside. Set it on the sill and push it into the opportunity until the nail fins hit the wall. Make sure none of the fins folded themselves back into the opportunity especially the lowest one. The man on the inside then centers the window in the opening. Then using a level, checks it for plumb and level, and applies shims where needed. You may also want to check the window for square, although a window that's terminated and in the locked position commonly is. The window can now be nailed in. My preference is roofing nails but 8d nails or cap nails will do the job.
If it is a accepted jamb (4 9/16) another thing to check is how far it runs past the rough framing. This should be 1/2 inch. You'll also want to make sure the window operates properly. Duplicate hungs should slide up and down nothing else but and casements should crank in and out without hanging up.
(C) 2005 Mike Merisko http://www.sawkerfs.com
Installing Windows in New building
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