2019 Idaho Real Estate Blog

Eliminate the thermal bridge on your exterior walls Main The Durable Green Home
do you have a noisy home? wonder why you have so many drywall cracks? why are there frost lines on the outside of your home? why do you have dark lines on the interior of your home? eliminate the thermal bridge and see what happens. how?.....

an Article featured in www.ebuild.com  today featured Dow building solutions announcing it's next generation rigid foam insulation R-5 per inch insulation with zero ozone-depletion factor. I have not studied the sustainability of this product from cradle to grave, but do know that eliminating the thermal bridge on exterior walls is by far one of the best insulation techniques for an energy efficient home. Of course if that is all you do it will not guarantee energy efficiency especially since new homes construction have air  leakage rates of 20-40% of the conditioned air loss.

 

But from a durability standpoint this method goes a long ways. by eliminating the thermal bridge on an exterior wall the wall  does not have a direct connection to the exterior. this is especially important in steel construction since steel is a much better conductor than wood. also the wood in the wall Assembly will not expand and contract as readily as a wall that does not have a thermal break-therefore reducing drywall cracks and shrinkage. And what about sound? Do you know why sound insulation is somewhat in-effective in reducing noise transfer? because the sound is telegraphing through the bridge.In a cold climate or mixed like Boise the insulating on the exterior can warm the surface of the wall Assembly to eliminate the chance of humidity condensing in the wall assembly when moisture is transfered from the interior of the home to the exterior during the heating season. it is important also in our  climate to use a permeable insulation (especially with wet cellulose insulation) to allow the assembly to dry to the exterior of the home. different climates require different techniques and wall assemblies. for a good read get the builders guide to your climate off the www.eeba.org  website. attention to relative humidity inside  and outside the home are very important in designing a high tolerance wall assembly. design for the what if-because Stuff happens right?

 
Posted by Tad Duby at 12/7/2007 10:37:00 PM
Comments (2)
Re:Eliminate the thermal bridge on your exterior walls
Tad,
Can you explain the dark lines from thermal bridging on interior of the home? I have seen this on a couple of homes and am curious what the cause is.Thanks. Eric
Posted by on 3/3/2008 10:10 PM
Re:Eliminate the thermal bridge on your exterior walls
this can be caused by a number of pollutant sources, mostly happens with people who burn candles. to ge the scientific full scale version of why this happens go to www.buildingscience.com or www.eeba.org and look for Joe Lstiburek comments on the subject. basically the stud where it contacts the drywall on the inside of thhe home is colder than the stud cavity (hopefully) because of thermal briding (cold traveling straight through a material (conduction-metal spoon in a hot soup bowl) so the molecules from pollutants, candles, combustion appliances, fireplaces, etc will gather at that spot leaving dark lines. hope this helps.
Posted by on 3/4/2008 6:31 AM
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