We are getting new windows. I decided to refinish the trim (from the 60's, but still in good shape other than the lacquer being gone). I removed the trim and found a gap between the frames of adjacent windows (see pic and pardon the chicken scratch). I was told this is normal.

I am concerned that when I nail the trim on the sides of the frame the frame will move (it wiggles a little already). Should I fill the gap with thin strips of plywood, secure the frame some other way, or is it fine as is?enter image description here


Filling the gaps with wood will cause your windows to jamb as the seasonal change of humidity. I would not fill with a solid for this reason.

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