Does Open-Cell Spray Foam Really Rot Roofs?

Posted on April 21,2015 by ab3 in attic

Murmurs and hearsay about open-cell spray foam insulation have been gaining traction for a while. It rots roofs, people have told me. Not long ago, someone even told me that in Florida, roofing companies won't let their workers go up on roofs with open-cell spray foam because the roofs are so spongy, the guys fall right through. Open-cell spray foam is getting a bad reputation among some people in the construction industry. But is it deserved?

Spray Foam Insulation Is Not a Cure-All

Posted on April 21,2015 by ab3 in air barrier

Spray foam insulation is a great product. Homes insulated with it can be some of the most efficient and comfortable homes built. I've been in plenty of homes insulated with spray foam and can tell you that, when done well, those homes are airtight and comfortable. I’ve also seen homes where the spray foam was a waste of money.

Joe Lstiburek on Spray Foam

Posted on April 21,2015 by ab3 in air barrier

Spray foam insulation evokes some interesting conversation among building scientists, construction professionals, environmentalists, and homeowners who have it in their homes. Many think it solves all problems, no matter how poorly it's installed. Some think it's helping to warm the planet and compromise the health of people and pets. In the middle are those who work with it regularly and see both the warts and the beauty of the product.

PHIUS Measures Its Approach to Spray Foam

Posted on April 21,2015 by Fretboard in blowing agent

On December 12, GBA posted an item about a Passive House Institute U.S. proposal to disallow use of spray polyurethane foam (SPF) insulation using hydrofluorocarbon (HFC) blowing agents with a high global warming potential. PHIUS also was considering extending the stricture to other petroleum-based insulation materials whose embodied energy is linked to greenhouse gas emissions.

Calculating the Global Warming Impact of Insulation

Posted on April 21,2015 by user-756436 in closed-cell

In June 2010, Alex Wilson published a ground-breaking article, “Avoiding the Global Warming Impact of Insulation,” in Environmental Building News. In the article, Wilson examined the implications of the fact that the HFC blowing agents used to make extruded polystyrene (XPS) and most types of closed-cell spray polyurethane foam have a much greater global warming impact than CO2.

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