Letters

摘要

Your recent article "Spray Foam: What Do You Really Know" (FHB #204 and online at FineHome building.com) touched on an important topic that seems to be rarely covered: the diminishing return that comes from increasing the thickness of spray-foam insulation. What could have been a great opportunity to discuss how to rationally decide how much insulation is "enough" was presented simplistically, as a matter of two people's opinions.rnWe are told that Chris Porter, the building-science and code manager for BioBased Insulation, says that 6 in. of open- or closed-cell foam "is perfectly adequate" in most parts of the country. Builder Michael Chandler, on the other hand, says that he's OK with "$3000 for the additional 2% in performance." Both of these statements are overly simplistic.