Insulate Under Bay Window Floor

The smooth surface between the floor joists is cardboard laying loose on top of the t g flooring.

Insulate under bay window floor.

Either way filling the floor cavity with spray foam delivers excellent thermal insulation while also keeping drafts out of your bay window area. And the farther a bay window protrudes from the house the more dramatic the effect and the more it opens a room. To be used under bay window. They include bay windows greenhouse windows bow windows bump outs porches and balconies.

If the floor is over a garage and has not already been insulated however it is recommended that each joist bay be filled with insulation. Celotex pl4050 is a thermal insulated plaster board. Side walls also need insulating if no cavity exists. In addition to floors other cantilevered architectural features may require insulation.

The void between the joints drops down below the floorboard level and seems to be a void until just above the ground floor window. Most people only insulate under the bay window. I am planning on insulating my 1st floor bay window using celotex or similar between the joints. Also added 2 pics under the bay window showing the white vinyl siding 1 8 green foam sheet insulation brown lap siding heavily weathered white trim board and 1 2 white styrofoam.

This high performance thermal insulation board has 50mm of pir insulation. I have removed the plaster and lathe but now i have a question. Bay windows are one of the more complicated window styles to install but their impact is well worth the effort. 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 window and floor deck cantilever insulation details. Consumes 2 to 3 times more energy than needed mainly because of insufficient insu. 50 mm celotex bonded to plaster board. This type of window protrudes from the house while also letting in lots of light.