I am in the midst of a basement remodel and just getting to replacing
the window. It has a metal frame around the opening. what kind of
material can I use to buffer the vinyl window from that metal opening?
Do I have to build a thin lumber frame out of pressure treated? or will
strips of the fiberglass insulation work...
I have about .5 inch to bridge the gap between the window and then
Expanding foam will deform the relatively flexible vinyl frame and the
sash will bind. In general, you want a mechanical connection, and
caulking or foam is used for weatherproofing/insulation. In such a
situation I'd screw vinyl angles to the metal frame. You'll have to
pre-drill and use a polyurethane adhesive/caulk between the angle and
metal frame and make sure the angles are all in plane or you'll have a
nightmare trying to seal the window. Then use PVC primer and glue and
glue the window to the angles. A few strategically placed aluminum pop
rivets couldn't hurt.
nah - On such a small window it will be fine. Use the minimum expansion
variety. Been there, done that. We are talking about those small basement
utility windows right? Only reason I would use a mechanical connection is to
make things a little more secure (from a security perspective). The foam
will hold just fine in this application.
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