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Was about to make the same comment as Robin. Too much foam will distort the frames, so take it easy, though you can wedge and foam fix windows. I've done it before a few times. Wedges need to be placed where they won't bow the framing. Corners and where the transom is are good spots. You can also place a piece of timber between the frames where the glass sits to stop it pushing in if you get too much foam behind the frames. Having said all that, if i was fixing into a timber frame, i'd just use screws.