Just took off old window mouldings (need to change them) and figure I will need to better insulate the space between the window trim and the wall. The "wall" consists of:
- a painted layer of thin 3mm (1/8 in) plywood or similar, followed by
- 2cm (3/4 inch) of styrofoam,
- after which there's something more solid that crumbles easily.
All are visible on the photo from right to left: plywood, styrofoam, crumbly solid stuff, some of the pink fiberglass insulation, white window trim.
The pink fiberglass insulation was either used rather sparingly or it somehow shrank with time, so there are gaps.
What's the most appropriate course of action? Add fiberglass insulation? Remove it and spray foam into the gap? Some combination of the two? Something else altogether?
Finally, there's already this question, but it's not about the trim/wall at all.