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Posted by Lynn Bijl on August 10, 2003, 8:46 pm
Could anyone recommend  a message group or web site for finding out about
superinsulated houses. Thanks.

Posted by News on August 13, 2003, 11:08 pm

Once you get to a high level thermal bridging then becomes the culprit to be
tamed. After that air-tightness.


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Posted by <sstreet2 on August 15, 2003, 5:46 pm
 Thermal bridging?  Would you mind elaborating?  What is thermal bridging?


Posted by Ecnerwal on August 17, 2003, 1:51 am

You have these beautiful well insulated walls - R25, R50

Then you put them together, and there are some joints which insulate
less. You put in windows and doors, and they insulate less. Pretty soon
you have an R10 building with R50 walls.

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Posted by Nick Pine on August 17, 2003, 12:46 pm

R1 per inch studs act as thermal short circuits through R3 per inch insulation.
SIPs (prefab glued plywood-foamboard-plywood sandwiches) can fix this. My
engineer/builder friend Al Eggen likes to use 2.5"x9.5" "wood I-beam" joists
($.38/foot from Fingerle Lumber) as studs and pour insulation into the walls
rather than using batt fiberglass with gaps and air leakage problems.

Corners and door jambs with lots of studs in one place...

Windows and doors seem different to me...


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