On Mon, Sep 20, 2010 at 8:38 AM, Scott’s Contracting <scottscontracting> wrote:
September 15th, 2010 in BlogsOfficial Fine Homebuilding Post, editor
Polyurethane is king when it comes to spray-foam, but some builders are looking at a few not-so-new alternatives.
Getting the facts on phenol-formaldehyde foam
When high-performance builders talk about spray-foam insulation, they’re typically talking about polyurethane. But it turns out there’s more than one kind of spray foam used in residential construction.
Although not as widely known, phenol-formaldehyde and urea-formaldehyde insulation also are available, and that’s the focus of this week’s Q&A Spotlight at Green Building Advisor.
Urea-formaldehyde earned a bad reputation in the 1970s after high levels of formaldehyde were detected in homes where it had been installed. Canada banned the foam outright, and some states in the U.S. continue to prohibit its use.
Some manufacturers turned to a phenol-formaldehyde resin with lower emissions. In the meantime, a urea-formaldehyde manufacturer says newer formulations meet federal formaldehyde standards.
How do these products differ, and how do they compare with urethane foam? The discussion points to the power and potential confusion over words, in this case the difference between “Tripolymer” and “tri-polymer.”
BuildingGreen’s Alex Wilson helps to sort it out, but admits that consumers will find it “remarkably difficult” to get the kind of information they’re looking for.