When using an advanced water-control layer, such as a self-adhesive or liquid-applied membrane, and a drainage mat or a draining insulation, such as mineral wool, no air cavity is needed. However, in IECC Climate Zone 5 and higher, and in areas with annual rainfall over 20 inches, a minimum 3/8-inch air cavity with vent openings top and bottom (far right) should be maintained.
Building Science Corporation When using an advanced water-control layer, such as a self-adhesive or liquid-applied membrane, and a drainage mat or a draining insulation, such as mineral wool, no air cavity is needed. However, in IECC Climate Zone 5 and higher, and in areas with annual rainfall over 20 inches, a minimum 3/8-inch air cavity with vent openings top and bottom (far right) should be maintained.

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