ICF Section
Water
Layering and taping of housewraps and flashings provide resistance to water and moisture penetration. Paperless drywall with a moisture-resistant core and other water-resistant materials provides extra protection from water damage. Vinyl wallpaper is avoided, so any water that does not drain from the wall can dry to the cooler, dehumidified home interior.
Drainage Planes and Vapor Barriers
A perforated, semipermeable housewrap may be used under sidings that do not leach surfactants—vinyl, metal, fiber-cement.
Nonperforated housewrap is used behind brick or wood. It retains its water repellency when exposed to surfactants that can leach from these materials.
ICF does not need a drainage plane, vapor retarder or air barrier.