XPS & global warming: Updates?
I keep reading that different, less harmful blowing agents than HFC-134a were supposed to come online for XPS foam. Some of these articles date back a few years, and make it sound like the change was imminent. Did any of this ever come to pass? Or are we still dealing with the status quo? The latest article of this kind was on GBA a few months ago. https://www.greenbuildingadvisor.com/blogs/dept/green-building-news/new-blowing-agent-lower-environmental-impact
Owens Corning Foamular is the most commonly used product in my area. This page (http://insulation.owenscorning.ca/architects/products/c-200.aspx) claims that Foamular has “70% lower global warming potential” than their previous XPS. Has the blowing agent changed from HFC-134a with it’s GWP of 1,430? Is the new impact GWP of 1430 x 30% = GWP of 429? Or is this more industry BS?
Here’s my real question: For the time being, should I continue to assume that the XPS at my local building supply store has an absolutely horrendous GWP, and continue to use other materials (EPS, polyiso, confortboard, etc) when practical, if I really care about global warming?
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