Insulating A Finished Attic With Knee Walls

Insulate across the top of flat attic. 1000 2000 cfm50 reductions are fairly common with this method. In this case the area behind the knee wall will be uncomfortably hot or cold.

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In these designs take out attic floor insulation only below the finished space from knee wall to knee wall and insulate the knee walls themselves.

Insulating a finished attic with knee walls.

Insulating the floor and kneewall requires more careful air sealing but is sometimes easier to insulate since you can use blown insulation. A job we finished last week dropped from 4060 to 2150 cfm50 just with knee wall air sealing we were able to get 8 of one wall that had no top plate. We prefer cellulose but we use fiberglass sometimes too. Despite all the bad publicity reflective insulation is getting lately i like to use it quite a bit on knee walls.

If you want the attic to be outside then using foamboard on the attic side of the knee wall is a good idea. Kneewalls short walls under sloped ceilings are common in story and a half homes and in bonus rooms above garages. In finished attic rooms with or without dormer insulate 2a between the studs of knee walls 2b between the studs and rafters of exterior walls and roof 2c and ceilings with cold spaces above. There are two basic ways to insulate a finished attic.

Although kneewalls can help turn attics into living space they often present insulation challenges most builders install fiberglass batts between the studs and some type of blown insulation between the floor joists. 2d extend insulation into joist space to reduce air flows. Unlike traditional walls with two finished sides. Added bonus the floor of this knee wall leaked too so there is a line of foam just above the floor joist.

We reduced the air leakage nearly 50 on this house in shaker heights without insulating the walls. 1a attic access door. Blown insulation in the knee wall and top attics. How to insulate knee walls.

Knee walls are half walls built into areas where a full sized wall will not fit such as finished attic crawlspaces. If only the living space will be insulated wrap the insulation around the room s walls and ceiling and then continue along the floor of the non living space.

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