: Unless the surround fastens directly to the wall, with no "space" behind it, it will not work. Even if it does, depending on what type of window it is, it may be difficult to seal around it. If the window is recessed, then a cultured marble surround might be better since it can also cover inside the recess. hj

Sue,
I too like the cultured marble surround for window applications.
It's a much better job.
Terry Love