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Posted by GHooper on April 15, 2008, 5:27 pm
Great idea, but better idea
would be siding, firring, 2" rigid foam, water/air barrier, 7/16" osb (air
sealed at seams and ends), 2x4 with closed cell foam, glued drywall to studs
and plates.
Siding offers rain,uv,mechanical protection but is not water proof. If your
using vinyl for siding, you dont need the firring.
2" of rigid foam is R-20 and the kicker is there wont be any thermal
bridging on the studs.
(keep the joints tight or even better use 2 layers 1" stagger the seams)
2" of foam at R-20, would also keep the dew point exterior of the water/air
barrier
7/16" osb I have nothing against it...
2x4, well your much better off loosing 2" on the studs and gaining it in the
insulation....
(you still get to use windows and doors with 2x6 Jambs !)
4" dence pack cellulose is great for air sealing and offers a high R but the
best you can get if you can afford it is closed cell foam,
hell there is nothing better.
Gluing the rock to the studs, top and bottom plates helps prevent air
infiltration.
Pay special attention to air infiltration, keep that to a minimum, but
always always supply ventialtion,
choose an HRV or an ERV at the least get exaust fan on a timer.
Glenn
> can i get some input on what layers to use on a new (eco-ish)
> construction in cold canada? i am thinking of (from outside to inside)
> siding, firring, 1"rigid foam, 7/16"osb, 2x6 with white fibreglass
> insulation, reflective vapor barrier, firring, drywall.
> do i need typar outside?
>
> also how common is it for mice to eat through PEX pipe? common enough
> that i should go for copper?
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