Air Seal Attic Knee Wall

Fiberglass batts work best if they re enclosed and air sealed on all 6 sides. Explanation offered in the video is that. That has the potential to degrade the insulation as convective air loops through the insulation.

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In the video it shows batt insulation in the kneewall studs then a piece of polyisocyanurate foam on the attic side of the kneewall.

Air seal attic knee wall.

Adding a rigid foam air barrier to the cold side of the batt is a great way to take care of this issue on a knee wall between finished and unfinished attic space. Install a continuous air barrier on the exterior side of the attic knee wall framing with a rigid air. It is important to choose an air barrier and insulation material that will reduce the air leakage and heat loss as much as possible. When possible insulate the slant wall with dense pack cellulose insulate knee walls with dense pack cellulose or fiberglass batts covered with house wrap.

Seal attic bypasses before insulating. The air moves right up the roof deck and out the ridge vent. Scope install a top and bottom plate or blocking at the top and bottom of all knee wall cavities. The insulation in the knee walls of an attic is usually uncovered on the attic side.

Knee walls may create open useful space from former attics but they are heat loss and homeowner comfort disasters. Install insulation without misalignments compressions gaps or voids in all knee wall cavities. Properly sealing and insulating attic knee walls can significantly reduce air leakage and heat loss between the conditioned space and the unfinished attic. The conditioned air escapes out the unsealed top of the knee wall where the top plate is attached to the roof rafter.

Create an airtight and structurally sound seal in the joist space under the knee wall.

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