Insulate Under Bay Window

I want to insulate outside under the bay but fiberglass insulation is too thick as i only have 1 1 2 between the bay ceiling to the bottom of the siding.

Insulate under bay window.

I have a bay window in my kitchen facing south that gets very cold on the floor during the winter months. Either way filling the floor cavity with spray foam delivers excellent thermal insulation while also keeping drafts out of your bay window area. I ve written quite a few articles on how to insulate basement walls and floors but one more specific topic related to this subject keeps coming up and that s how to insulate a bay window floor or cantilever floor framing. 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.

The problem of having cool floors under bay or bow windows and alcoves is a very common one. Bay window and floor deck cantilever insulation details. And the farther a bay window protrudes from the house the more dramatic the effect and the more it opens a room. This high performance thermal insulation board has 50mm of pir insulation.

Side walls also need insulating if no cavity exists. Celotex pl4050 is a thermal insulated plaster board. 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. To be used under bay window.

Buy this item from amazon uk. This type of window protrudes from the house while also letting in lots of light. No vapour barrier is required and the foam blocks a considerable amount of sound transmission from the outdoors too. Outside under the bay is open.

In this article i ll share a detail for new construction and also a detail for renovating existing bay window. Bay windows are one of the more complicated window styles to install but their impact is well worth the effort.