Insulate Below Bay Window

This is a great example of how to insulate a bay window.

Insulate below bay window.

New construction bay window floor overhang insulation detail. 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. 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. A bay window juts out and away from the house usually in a semicircular form much like an observatory window. The problem of having cool floors under bay or bow windows and alcoves is a very common one. Bay windows are one of the more complicated window styles to install but their impact is well worth the effort.

Either way filling the floor cavity with spray foam delivers excellent thermal insulation while also keeping drafts out of your bay window area. The rim joist under the window appears to have only the 1 8 green foam vinyl and lap siding covering it no other insulation. 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.

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. And the farther a bay window protrudes from the house the more dramatic the effect and the more it opens a room. 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.

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