Fi-Foil’s Vapor Shield is a multi-layer reflective insulation intended for use on furred-out masonry walls. The inside layer is a minimum .00045” aluminum foil. The outer layer is 35 lb. natural kraft paper coated with polyethylene, Flange boards or expanders separate the paper from the foil creating a 3/8” reflective air space. When installed on furring strips spaced 16” or 24” on center, a second reflective air space is formed. This air space is dependent upon the thickness of the furring strip selected. AA2 Vapor Shield is available in Standard & High-perm.
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