Foam problems vary from perceived problems with good quality foam installations to off-ratio installations where un-reacted chemicals are present. The decision to repair the foam would be based on the ability of the material to still perform its intended function, and to do so at a reasonable cost. Replacing is always the first preference if the material is likely to compromise indoor air quality and not be capable of performing the intended building envelope functions. Encapsulation and ventilation are approaches that can be employed separately or together when it is impractical to repair or replace foam which is compromised, or to assure air quality in repair situations. These methods must be considered on a case-by-case basis.