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Posted by daestrom on August 17, 2003, 2:20 pm
 


Yeah, me too.  I've always considered windows/doors separate from thermal
bridging.  I think of bridging as calculating an 'average' R-value for a
type of wall construction.  Superinsulation between metal studs, the metal
studs can be a significant reduction in R-value.

daestrom



Posted by Robert Scott on August 17, 2003, 8:30 pm
 

I built my house using walls made of 2x8 top and bottom plates and 2x4
studs staggered, 24" OC inside, and 24" OC outside.  3.5" fiberglass
batt, 23" wide, was inserted in the two overlapping layers - no
thermal short circuit.  The only disadvantage was that standard 1/2"
drywall could not be used on the inside - the span was too long.  I
had to use 5/8" drywall instead.  Also, I had to convince the building
inspector that my stud arrangement offered more support than a
standard 2x4 wall 16" OC.


-Robert Scott
 Ypsilanti, Michigan
(Reply through newsgroups, not by direct e-mail, as automatic reply address is
fake.)


Posted by <sstreet2 on August 20, 2003, 2:44 am
 

drywall


Posted by News on August 26, 2003, 2:46 am
 

Do you mean staggered studs?  Where a stud does not run from outer to inner.
Thermal bridging is mainly occurs where one form of construction meets
another: wall to roof, wall to floor, brick to timber, etc.  A 4x2 stud wall
can havea sheet of foa insulation over it to reduce thermal insulation.

The higher the insulation value the more of a devil it is as it reduced the
R value substantially.  With a lower insulated wall, it overall makes little
difference to the total R value.  Eliminating thermal bridging in highly
insulated wall gives great results, whereas on a poorly insulated wall
eliminating it brings in little to the overall R value of the wall.  That is
not to say it should be ignored at any time.

It is not easy having a continuous uninterrupted band on insulation all
around a building:
floor, walls, roof.  SIPs are brilliant in this aspect.

I the book EcoHouse - A Design Guide: thermal bridging is described as
"invidious".



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Posted by Michael Dewolf on September 4, 2003, 3:43 pm
 "News"  wrote in message


Yes, and no.  I'm talking standard 'stick' building.  Studs that
connect outer to inner -minus a thin coating of foam, spaced 12 to 16
inches.

Michael D

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