Insulate Below Bay Window

The bay window below needed 8 panels cut 600mm wide then 2 smaller width ones at the ends.

Insulate below bay window.

The panes of glass used to create such windows as. I want to insulate the bottom of this bay window after i repair the sill. Never having done this i want to make sure what i plan to do makes sense and there are no gotchas. This is a great example of how to insulate a bay window.

How to seal a leaky bay window. The problem of having cool floors under bay or bow windows and alcoves is a very common one. This type of window protrudes from the house while also letting in lots of light. Bay windows are one of the more complicated window styles to install but their impact is well worth the effort.

A bay window juts out and away from the house usually in a semicircular form much like an observatory window. The sketch above shows one method for insulating the deck overhang at a bay window or cantilever that encloses a bump out. New construction bay window floor overhang insulation detail. The rim joist under the window appears to have only the 1 8 green foam vinyl and lap siding covering it no other insulation.

Either way filling the floor cavity with spray foam delivers excellent thermal insulation while also keeping drafts out of your bay window area. I recently found the styrofoam under the bay was only press fit in some areas no fasteners held up by a friction fit on the back side of the lap siding. Consumes 2 to 3 times more energy than needed mainly because of insufficient insu. Quite often the insulation in this area is dealt with long after the framing is finished and results in a very cold drafty spot in the house.

Because it is difficult to properly insulate and air seal these areas without filling the cavity getting sufficient heated air in to warm these areas during the winter months can be tricky.