Insulate Under Bay Window Floor

Bay window and floor deck cantilever insulation details.

Insulate under bay window floor.

I am planning on insulating my 1st floor bay window using celotex or similar between the joints. No vapour barrier is required and the foam blocks a considerable amount of sound transmission from the outdoors too. 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. In addition to floors other cantilevered architectural features may require insulation.

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. They include bay windows greenhouse windows bow windows bump outs porches and balconies. Consumes 2 to 3 times more energy than needed mainly because of insufficient insu. This high performance thermal insulation board has 50mm of pir insulation.

50 mm celotex bonded to plaster board. Celotex pl4050 is a thermal insulated plaster board. I have removed the plaster and lathe but now i have a question. Buy this item from amazon uk.

And the farther a bay window protrudes from the house the more dramatic the effect and the more it opens a room. The void between the joints drops down below the floorboard level and seems to be a void until just above the ground floor window. 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. This type of window protrudes from the house while also letting in lots of light.

To be used under bay window. Most people only insulate under the bay window. Side walls also need insulating if no cavity exists. The smooth surface between the floor joists is cardboard laying loose on top of the t g flooring.