Window installation

Old 10-13-04, 02:17 AM
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Window installation

I am building a house with low e argon gas filled high efficiency wood framed windows. The manufacturer's instructions say not to shim the top of the windows nor to nail the top flange to the frame. My builder says this is not important. I disagree, but I can't find any standard installation guides that speak to this issue.

Can anyone help?
Old 10-13-04, 05:59 AM
glasman2's Avatar
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you are correct, don't shim the top, or nail it.
At the top drive a nail about 1/2 inch above the nail fin till about 3/4 of an inch of the nail is left out and bend it over the nail fin. This secures the top and allows the head to expand as needed with the house.
Old 10-13-04, 11:30 AM
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Yes that's right. It's meant to allow the opening the window is setting in to expand and contract or change without ruining your window.

One thing that always confused me is why don't they just make the top flange solid instead of putting those tempting little nail holes in it in the first place, but they continue to make them that way regardless.
Old 10-13-04, 07:55 PM
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I had three very large single hung windows that I installed. I elongated the holes verticaly and nailed them. I nailed them so the windows could slide up and down if the headers move, Think this old house will not have a lot of settling so I feel it was a good solution.

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