I'm remodeling our bathroom and we have a vinyl double hung replacement window that we'd like to replace with an insulated frosted window. A non opening single piece of glass that will allow the water to drain away easily. Previously we used a window shower curtain to keep the water out of window tracks.
This window looks to be held in with 4 screws through the side and a ton of caulking.
On the exterior, there looks to possibly be nailing tabs but can't tell with all the caulk.
Will I need to remove a lot of the siding, or just the J channel?
My main concern is keeping it water tight on the outside. Will I need to get ice and water shield in there around the frame?