just wondering if anyone knows what the r value of pine would be , i've looked online but cant seem to find a value showing wood on its own - not as part of a system TIA
smallwoods,
Nov 22, 11:35am
In what context?
bergkamp,
Nov 22, 12:18pm
eg a solid wood wall , like a log cabin . or in a 90mm wall where the lintel ,top plates etc can take up large areas
zak410,
Nov 22, 12:38pm
"The R-value for wood ranges between 1.41 per inch (2.54 cm) for most softwoods and 0.71 for most hardwoods. Ignoring the benefits of the thermal mass, a 6-inch (15.24 cm) softwood log wall has a clear-wall (a wall without windows or doors) R-value of just over 8."
thats what i wanted to know . so R1 for 90mm of framing , dependent on moisture i saw a video on broken framing , 6x2 framing that is 2 3x2 held apart with dowels and foam ,including lintels top and bottom plates
stevo2,
Nov 22, 8:32pm
We built a home for an insulation expert a few years ago. Most external walls were 90x45 with the best insulation he could fit in there. We then strapped it with 45x45 offset from the 90x45 and he insulated that as well. He said that was better than a 140mm insulated wall because the timber had a bad R rating.
tweake,
Nov 22, 8:54pm
sounds like one of the Tstud video's.
this is what annoys me a bit with a lot of theses houses with huge amounts of glass. they have to have so much steel work (0 R value) or lots of wood (R1) and there is very little insulation actually used. i'm not sure if the modelling even takes that into account.
tweake,
Nov 22, 9:02pm
yes, the other way is to use a thermal break. in the right climate you can use some of the insulating panel products, however they generally tend to have low permeability (EIFS and its issues).
but of course keep in mind, the best insulation in the world does sweet f all if you do not control the air leakage.
bergkamp,
Nov 22, 9:56pm
to me thats a sin , i would rather have the structure !
its also interesting that solid timber houses may have less R value but they have greater thermal mass .
golfaholic2,
Sep 6, 8:07pm
More mass than a normal wall but not enough to counteract the losses from thermal bridging . not even close
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