Blog

Mineral Wool Boardstock Insulation Gaining Ground in the Homebuilding World

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Roxul ComfortBoard IS has some important environmental and performance advantages over XPS and polyisocyanurate insulation

ComfortBoard IS, Roxul's exterior insulation board, is being distributed nationwide in the U.S. at thickensses up to 3".Photo Credit: Roxul

Readers of this Energy Solutions blog may be aware that I’ve been critical of some of our foam-plastic insulation materials.

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A Good Time for Energy Audits and Weatherization

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Few others are thinking about energy audits and weatherization, but now’s a good time.

Weatherization should target the biggest air leakage sites.Image Credit: U.S. Department of Energy

Wait a second. Spring has barely sprung, and you’re saying we need to start thinking about energy audits already? What’s up with that?

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What’s Different About Unity Homes?

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Panelized construction, meticulous attention to energy detailing, and a sophisticated computer design system put Unity Homes at the cutting edge of home buiding.

A Unity Homes wall section at the company's Walpole, NH factory. Click to enlarge.Photo Credit: Alex Wilson

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EcoSeal: A New System for Air Sealing Homes

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Knauf Insulation's EcoSeal can provide significant air-sealing prior to installing cavity-fill insulation

Installing Knauf EcoSeal at our farmhouse. Click to enlarge.Photo Credit: Alex Wilson

Getting back to our Dummerston, Vermont farmhouse this week, I’m reporting on our use of a relatively new product for air-sealing homes: EcoSeal from Knauf Insulation.

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Växjö, Sweden: A Model of Sustainability

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Växjö, Sweden embraced the U.N's Agenda 21 and is now a model of sustainability

Växjö Energi AB's wood-chip-fired CHP plant. My host is standing in front of a large steam turbine. Click to enlarge.Photo Credit: Alex Wilson

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LEED IEQ Space Matrix - Frequently Asked Questions

Earlier editions of this spreadsheet from USGBC raised more questions than they answered, but some of the frequently asked questions about the matrix have been addressed with this latest release.
by Lauren Sparandara

The IEQ Space Matrix, currently in its third edition as of April 1, 2015, contains lists that categorize spaces for applicability to LEED Indoor Environmental Quality (IEQ) credits. The lists are modified from the spaces in IES Lighting Handbook, 10th Edition. These lists should be used along with the general credit guidance, notes, and definitions provided in the General Credit Guidance and Notes and Definitions tabs.

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7 Tips to Get More from Mini-Split Heat Pumps in Colder Climates

Air-to-air heat pumps are getting more popular as a primary heat source in colder climates. Here’s how to get the most from your system.
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[Editor's Note: This guest post comes to us courtesy of Peter Talmage, P.E., an energy and design consultant and an instructor in the Renewable Energy & Energy Efficiency program at Greenfield Community College. Originally published April 4, 2013.]

I have heated my various homes with wood since 1975. It was always a love/hate relationship. The wood fuel was “free” off my land, but burning it was a very dirty business in many ways.

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Installing Cork Insulation

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Climbing the learning curve in working with a new insulation material

Sliding a slab of precisely cut cork insulation against a door jamb. Click to enlarge.Photo Credit: Alex Wilson

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GBCI Invites Direct Inquiries—But Do Your Homework First

“Winging it” on project-specific LEED credit questions is no longer advised with a new communications initiative.
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In recent months, GBCI (the Green Building Certification Institute, which works closely with the U.S. Green Building Council to certify LEED buildings) has quietly updated its approach to communicating technical advice to LEED project teams. Teams that have tried the process report being very satisfied with the results, but the new policy is still not well known.

The new policy could be summed up in two quick points:

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