Foam Board Attic Knee Wall

An insulated kneewall is effectively an exterior wall so you ll need a layer of rigid foam drywall osb or thermoply on the back side of the kneewall to prevent cold air from degrading the performance of the insulation. Start at left or right side to install the first board using cap. You can use foam board to make baffles near your soffit vents and then blow in enough insulation to reach the r value you want.

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Using foam spacers you can attach the foil behind the drywall and then stuff the remainder of the wall cavity with traditional insulation or foam board.

Foam board attic knee wall.

If you want the attic to be outside then using foamboard on the attic side of the knee wall is a good idea. There are as many ways to do it as there are people who do it. Boards may be used vertically or horizontally to minimize cuts. Cut boards to snugly fit from bottom to top of wall.

Then you will leave the wall exposed to the attic so the radiant barrier is facing an air space the attic air space. The best way to provide that sheathing is to use a rigid material. Replace foam into the board and then tape with homesealr. This method of insulation won t work if the triangular attic includes ducts or plumbing pipes.

This method has you place the foil closest to the inside of the wall cavity with an air gap. When installing foam insulation boards in the attic make sure you start from one corner and work your way around the room. Foam insulation boards can be attached to concrete walls as well and in such a case care should be taken not to chip the cement. Attic knee wall gable ends.

I ve also seen attic kneewalls sheathed with non rigid materials mainly housewrap. You ll need to air seal all the penetrations and leaky spots like joists under the kneewall. Another way to install the radiant barrier on a knee wall is to do so via the cathedral ceiling method. One of the best methods is rigid foam board with sealed joints over insulation in the knee wall.

This is not very easy in most of the older houses we work on because the hatches and attics are too small to get rigid foam board through. I ve seen osb oriented strand board the flaky plywood foamboard and structural or non structural cardboard sheathing materials like thermo ply.

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