Insulate Under 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.

Insulate under bay window.

The problem of having cool floors under bay or bow windows and alcoves is a very common one. Outside under the bay is open. I have a bay window in my kitchen facing south that gets very cold on the floor during the winter months. And the farther a bay window protrudes from the house the more dramatic the effect and the more it opens a room.

No vapour barrier is required and the foam blocks a considerable amount of sound transmission from the outdoors too. Side walls also need insulating if no cavity exists. This type of window protrudes from the house while also letting in lots of light. To be used under bay window.

Buy this item from amazon uk. 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. Most people only insulate under the bay window. Bay window and floor deck cantilever insulation details.

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. Bay windows are one of the more complicated window styles to install but their impact is well worth the effort. Celotex pl4050 is a thermal insulated plaster board. 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.

In this article i ll share a detail for new construction and also a detail for renovating existing bay window. This high performance thermal insulation board has 50mm of pir insulation.