Fill gaps between vinyl window and aluminum frame with expanding foam?

Question

I'm trying to re-trim a corner window in the kitchen. I'm not familiar with window terminology, so my apologies in advance.

It's a double paned window set into an aluminum frame. I've owned the house for about three years and the house was built in 1941. Wish I knew the history of the window (retrofit?), but alas, I don't. The previous owners / installers used Trimquick flat vinyl trim to cover the gap between the vinyl window and the wooden jambs. This leaves a void around the aluminum frame.

• Is this a normal best practice when retrofitting with a new double-paned window?

• Could I use expanding foam to fill the void between the window and jamb (that the Trimquick flat vinyl covers)? (Mostly to address potential air-draft leakage)

Thanks in advance.

Answer 1

Expandable foam is actually code required in some locations, for window installation.

A few different manufacturers make a foam specifically for windows and doors. It is expandable but will not cause a bow in the frame. It contracts too, so it conforms to many changing weather conditions.

Answer 2

There are low-expansion-force foams intended for use around window and door frames where a traditional foam might push them out of straight. I've used them. But don't take my word for it; I'm not competent to say more than "read the installation instructions that come with the window."