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Radiant Barrier > Installation > Walls
Radiant Barrier in Walls and Crawl Spaces
Radiant Barrier wall sheathing can be attached to the attic (exterior) side of a knee wall to cut down on radiant heat gain or heat loss in the winter. It is recommended that insulation be encapsulated on all six sides with a rigid air barrier like sheathing or foam board. If possible install sheathing on the attic side first and then cover with radiant barrier.
This image was taken from the interior prior to radiant barrier wall installation of sheet rock.
If your local climate or building code calls for an interior vapor barrier, Non Perforated Radiant Barrier can be used as a vapor / radon barrier. Radiant barrier in walls will reduce moisture inside the house from passing through into mass insulation.