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May 26th, 2011

Welcome!

Welcome to GreenSpec Insights, an independent resource for architects, green consultants, and building product specifiers. Each week, we aim to bring you not only unbiased new product reviews, but also insights into what's really important for environmental performance in specific product categories. We hope you find it useful -- send your suggestions and other comments to Insights@GreenSpec.com.

Past GreenSpec Insights Issues

Spray Foam: Good or Evil?

Formaldehyde, it's everywhere!

Isocyanate-Free Polyurethane Maker Glosses Over Bisphenol-A Content

- Brent Ehrlich

A new clear floor coating for the commercial and industrial market is being touted as not containing isocyanates, potentially toxic chemicals used in a wide variety of building products. But it does contain epoxy, made from bisphenol-A. Can an epoxy-based polyurethane truly be "green" as its name asserts?
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Isocyanate-Free Polyurethane Maker Glosses Over Bisphenol-A Content


Green Polyurethane is a hybrid that creates a surface that has better adhesion, three to four times the corrosion resistance, and 50% more chemical resistance than conventional polyurethanes. And it does so without solvents, VOCs, or the use of isocyanates. Sounds great! Unfortunately, epoxy is made from the endocrine disruptor bisphenol-A (BPA).

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Getting "Under the Hood" with Energy-Efficient Windows

- Tristan Roberts

What makes high-performance windows perform? We look at double- and triple-glazing, low-emissivity coating technologies, and more.
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Getting


What's the highest-tech piece of engineering that's a part of your home or workplace? I would suggest that by some measure, it's not your furnace, your fridge, your dishwasher, your hot water heater, or even your ground-source heat pump and radiant heat, if you have that. It's your windows.

Look at what we ask windows to do. We want a visual connection to the outdoors that lets in daylight and that is itself pleasant to look at, both from the inside and the outside. We expect windows to provide fresh air and cooling breezes at times, but at other times we expect them to be completely airtight and provide good thermal insulation. Insects should be kept out; children and pets in. In heating climates, we want to get solar heat gain from windows, but not too much, and in all climates we don't want glare.

Do argon and krypton leak over time? Also find out about the third generation of low-e coatings in the rest of the article.

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