Can I caulk around this window trim? ( sh.itjust.works )

bhmnscmm , 8 months ago

Is this picture from the exterior? I’m guessing this is a fixed vinyl (as opposed to wood) window?

If it’s the exterior, that gap might be for water drainage. If it’s the interior it might be for equalizing interior and exterior pressure. I’m doubtful either is the case though.

Filling the gap is likely okay.

SoySaucePrinterInk OP , 8 months ago

This is the interior of a fixed window. Below it is a sliding screen window, then a sliding single pane window, and finally another sliding single pane window.

bhmnscmm , 7 months ago

Unfortunately since these are single pane windows most of the thermal performance issues will be due to the glass. Sealing this gap will help some, but it will be just a drop in the bucket.

Replacing the windows with insulated glass (two pane) windows is ideal. However that will be expensive.

The easiest/cheapest option will be the temporary cling-film type kits you can buy–you won’t be able to operate the windows, but that probably won’t be an issue in the winter. Properly sized/installed storm windows will help some too, and be significantly cheaper than new windows.