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The insulation in the knee walls of an attic is usually uncovered on the attic side.
Air seal attic knee wall. When possible insulate the slant wall with dense pack cellulose insulate knee walls with dense pack cellulose or fiberglass batts covered with house wrap. The conditioned air escapes out the unsealed top of the knee wall where the top plate is attached to the roof rafter. That has the potential to degrade the insulation as convective air loops through the insulation. Knee walls may create open useful space from former attics but they are heat loss and homeowner comfort disasters.
Create an airtight and structurally sound seal in the joist space under the knee wall. Properly sealing and insulating attic knee walls can significantly reduce air leakage and heat loss between the conditioned space and the unfinished attic. In the video it shows batt insulation in the kneewall studs then a piece of polyisocyanurate foam on the attic side of the kneewall. Fiberglass batts work best if they re enclosed and air sealed on all 6 sides.
Install insulation without misalignments compressions gaps or voids in all knee wall cavities. Install a continuous air barrier on the exterior side of the attic knee wall framing with a rigid air. The air moves right up the roof deck and out the ridge vent. Explanation offered in the video is that.
Seal attic bypasses before insulating.
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