Insulate Below Bay Window

I want to insulate the bottom of this bay window after i repair the sill.

Insulate below bay window.

Never having done this i want to make sure what i plan to do makes sense and there are no gotchas. A bay window juts out and away from the house usually in a semicircular form much like an observatory window. 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. I am thinking of putting 4 thick foam insulation under it cover that with plywood and finishing off with trim boards around the bottom to hide it.

No vapour barrier is required and the foam blocks a considerable amount of sound transmission from the outdoors too. Consumes 2 to 3 times more energy than needed mainly because of insufficient insu. How to seal a leaky bay window. 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.

This is a great example of how to insulate a bay window. And the farther a bay window protrudes from the house the more dramatic the effect and the more it opens a room. The sketch above shows one method for insulating the deck overhang at a bay window or cantilever that encloses a bump out. The panes of glass used to create such windows as.

Bay windows are one of the more complicated window styles to install but their impact is well worth the effort. New construction bay window floor overhang insulation detail. Either way filling the floor cavity with spray foam delivers excellent thermal insulation while also keeping drafts out of your bay window area. This type of window protrudes from the house while also letting in lots of light.

The rim joist under the window appears to have only the 1 8 green foam vinyl and lap siding covering it no other insulation.