Thursday, February 22, 2018

Installing Insulation With the X-Floc Ventilated Dry Injection System

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A Massachusetts company claims, “We don't just do cellulose; we do it better.”
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At the end of my recent blog on Kooltherm rigid phenolic foam insulation, I mentioned that the roof and wall assemblies at an energy retrofit project in Brattleboro, Vermont, were insulated with cellulose by a company called American Installations.

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from Building Science http://www.greenbuildingadvisor.com/blogs/dept/building-science/installing-insulation-x-floc-ventilated-dry-injection-system

Wednesday, February 14, 2018

Is R-8 Duct Insulation Enough?

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Code requirements are always a compromise between what’s best and what’s practical
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If you know a little building science, you've no doubt seen a lot of problems that occur with air distribution systems. Ducts just don't get anywhere near the attention they deserve in most homes.

I've written about ducts quite a bit here and have shown problems resulting from poor design and installation. We all know how stupid some of those problems are. So today I'm going to talk about a problem that doesn't get nearly enough attention: duct insulation — even when the design and installation are perfect.

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from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/r-8-duct-insulation-enough

Thursday, January 25, 2018

Kingspan Kooltherm Phenolic Foam Rigid Insulation

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A deep-energy-retrofit project uses Kooltherm as part of a high-performance attic insulation system
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Improving the thermal performance of an existing attic is often challenging: workers are faced with narrow cavities, low clearances, and claddingMaterials used on the roof and walls to enclose a house, providing protection against weather. systems that make it hard to achieve desired R-values while still maintaining the necessary drying potential of the assembly.

The house at 81 Chapin Street in Brattleboro, Vermont, is no exception. It’s a 100-year-old wood-framed two-story home that Alex Beck and Candace Pearson are determined to comprehensively retrofit to high performance.

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from Building Science http://www.greenbuildingadvisor.com/blogs/dept/building-science/kingspan-kooltherm-phenolic-foam-rigid-insulation

Wednesday, January 24, 2018

Adjusting Bath Fan Use in Winter

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Do you really need to run it when you shower?
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You may have heard or read somewhere that you should run your bathroom exhaust fan whenever you take a shower and then let it run for a while after you're done with the shower. Showers increase the humidity in the bathroom. Sometimes it gets high enough to cause condensation to appear on the mirror and other surfaces in the bathroom. And that can result in mold growth.

So you should always run your bath fan when you shower. Or so they say.

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from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/adjusting-bath-fan-use-winter

Wednesday, January 10, 2018

Ventilating a Home in Cold Weather

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You need fresh air, but bringing in cold outdoor air can cause problems
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When I woke up Saturday morning, the temperature outdoors was -40 degrees. The wind chill was -100 degrees! It was just unbelievably, impossibly, inhumanly cold outside. Fortunately, that was on a mountaintop in New Hampshire and not where I was. I happened to have woken up on a mountaintop in North Carolina, where the temperature was a much warmer -3°F.

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from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/ventilating-home-cold-weather

Thursday, December 21, 2017

Night Surveys: The Lights Are On, But Nobody is Home

Subtitle: 
How Yale University's energy manager uses after-hours walk-throughs to save energy
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Julie Paquette has been Director of Energy Management at Yale University for about 6 years. That means the buck stops at Julie’s desk for the energy consumption of over 400 buildings on campus. Yale has a pretty sophisticated approach to energy, including the Yale Facilities Energy Explorer, an energy dashboard system that shows energy consumption and details for every one of those 400 Yale buildings.

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from Building Science http://www.greenbuildingadvisor.com/blogs/dept/building-science/night-surveys-lights-are-nobody-home

Wednesday, December 20, 2017

The Buy-in Problem

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From code compliance to Passive House certification, getting good work from contractors is hard
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Last week I read a nice little article by Steve Baczek about getting buy-in from the various stakeholders involved with building a home. He's an architect who works closely with the people who build the homes he designs. He's also a former U.S. Marine who understands the importance of what he calls "a ladder of leadership and responsibility."

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from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/buy-problem