I've recently had wallpaper stripped and the guy managed to remove two of the PVC window trims in the process. This has exposed a gap between the top of the window and the wall of about 1.5 inches, and the same at the bottom beneath the sill a gap of approx 1 inch on half the length of the sill (see pics). The holes go right back about 5 inches deep. I haven't removed the other two sides of the trim but I can see behind them and the main gap is at the top and bottom of the windows.
I don't like the trim any way so happy to remove all of it, but my question is… how do I fill these gaps before I get the plasterer in? Do I need a tradesman to do this properly or can I do this myself – I am a complete novice with limited DIY experience albeit I am willing to give it a go if simple!
I've read that expanding foam might work, is the right? The room will be skimmed after I get this fixed, will I need to replace the trim afterwards or can I just caulk around the edge of the window to the new skimmed plaster? Any help greatly appreciated on how to fix this.
Best Answer
Gaps around windows are common (there's a reason why they're called "rough-in"). As long as the gaps aren't larger than the trim, you're fine. Oddly enough, the old trim looks like it was attached to the window. That would explain the gap (it wasn't visible from the inside).
The unusual thing here is the size. Expanding foam is your friend here, but be sure it will fill a gap that large. Not all foam will expand 1" or more but there are types that can.