I am installing a two pc. tub/shower insert and have several gaps between the tub and the frame of the insert (fiberglass). It is on an exterior wall on the rear of the tub, and this being Wisconsin, we are known to have some cold days–so how do I keep the tub as warm as possible?
Is it ok to use great stuff to fill in the gaps if I do it a little at a time–over several days. Or should I fall back on poly wrapped fiberglass batts?