thermal bridging

Blogs Prime Article Walls With Interior Rigid Foam

Placing a Concrete Foundation on Rigid Foam Insulation

Posted on April 18,2015 by blueworker in concrete slab

It should go without saying that any high-performance building should be built on a solid foundation. So why would we set our building on a layer of foam insulation? The answer, of course, is to limit thermal bridging. Those bridging effects can cause a significant amount of heat loss through the mass structure at the base of the building. By thermally isolating the building foundation from the ground, building performance is improved, not only from an energy performance standpoint but also in terms of comfort and moisture management.

New GBA Details for ‘Juliet’ Balconies

Posted on April 18,2015 by GBA Team in balcony

GBA's library of construction details continues to expand. The latest two additions are details for second-floor balconies. Many second-floor balconies — especially those created by cantilevering floor joists — leak heat and admit water. To avoid problems with air leakage, thermal bridging, and moisture entry, use one of the following details

What is Thermal Bridging?

Posted on April 18,2015 by user-1048334 in thermal bridge

Like wind washing, thermal bridging is something folks mention all the time during audits (meaning they never ask about it). But what is thermal bridging, and why do I keep bringing it up when my customers just want new windows? To understand thermal bridging, you need to understand your home’s wall assembly and the various materials used in its construction.

The Thermal Bridge to Nowhere

Posted on April 18,2015 by ab3 in Bailes

Let's play a little game today. Take a look at that photo at right. See anything that bothers you?* Well, pretend that you're the heat in the house once everything is finished and people are living in it. Does that help? If your answer is still no, let me give you a little help. Here are the approximate R-values of wood and the standard insulation you might find in a wall (fiberglass, cellulose, open-cell spray foam):

Insulation: R-3.7 per inch

Wood: R-1.1 per inch

Building With Steel Framing

Posted on April 18,2015 by ScottG in light-gauge steel

Sal Lombardo is planning a new home in the New York-New Jersey area (Climate Zone 5) and is looking at a long list of high-performance construction options: double-stud walls, structural insulated panels, insulating concrete forms, Larsen trusses, and walls built with light-gauge steel framing. Wait a minute. Steel framing, as in the stuff that leaks heat through the building envelope like a proverbial sieve? Maybe, Lombardo says, it deserves another look.

Thermal Bridging

Posted on April 18,2015 by Peterbilt in steel framing

Everything is relative — especially when it comes to thermal bridging. Thermal bridging occurs wherever assembly components with low R-values relative to surrounding materials span from the inside to the outside of a building assembly. Thermal bridging takes place in wood-framed assemblies because, although wood is a pretty good insulator at about R-1 per inch, it is at least three times more thermally conductive than any cavity insulation, which start at about R-3.5 per inch.

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