Just fitted a new uPVC window today - well, part-fitted anyway - problem is that to cut a long story short I've ended up with too much clearance at the sides and top. The window is currently in place with about 0.5" either side, held in place by long screws for the moment (and TBH it's pretty firm).
Given that I'm not going to buy a new window, how would people recommend proceeding? I'm thinking the space is too wide to fill with expanding foam... should I pack with mortar? timber wedges? Also, I'd much rather have the window central in the opening, but would I stand a better chance of a good result if I pushed it to one side and filled the resulting (even larger) gap? Suggestions gratefully received!
David