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Practicality of 2x8 walls David Bonnell 02-01-2007
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Posted by on February 1, 2007, 2:34 pm
I saw one of these hombuilder TV shows and all of the houses were
either 2x6 or 2x8 (I forget which) with blown in foam insulation.
This was for houses in the DC area.


Posted by Glenn on February 1, 2007, 3:53 pm
Remember that you can get a house too tight. You need a little
clean air to breath once in a while because if you don't turn
green, the walls might.


>I saw one of these hombuilder TV shows and all of the houses were
> either 2x6 or 2x8 (I forget which) with blown in foam
> insulation.
> This was for houses in the DC area.
>


Posted by Matt Whiting on February 1, 2007, 6:59 pm
Glenn wrote:

> Remember that you can get a house too tight. You need a little clean
> air to breath once in a while because if you don't turn green, the walls
> might.

True, but an HRV/ERV is a better solution to this problem than is
leakage through the structure.

Matt

Posted by marson on February 1, 2007, 8:03 pm
> Glenn wrote:
> > Remember that you can get a house too tight. You need a little clean
> > air to breath once in a while because if you don't turn green, the walls
> > might.
>
> True, but an HRV/ERV is a better solution to this problem than is
> leakage through the structure.
>
> Matt

I'm currently working on a project using double 2x4 walls. It is also
fairly common to see 2x6 walls skinned with 1" of xps. Practical?
Sure. It costs more, but I suppose there will be a savings down the
road. With the double 2x4, you wind up with some pretty deep window
jambs, but the rest is straightforward. As Bob M. says, batts
wouldn't really work, so we are using blown in cellulose, which gets
blown behind netting. Of course, you still have heat loss through the
windows. We are using the most energy efficient windows out there,
but they are still only have a U of .17, which I believe translates
into R 6 or so. HRV's are required by code where I live.


Posted by Michael Bulatovich on February 1, 2007, 8:47 pm

>> Glenn wrote:
>> > Remember that you can get a house too tight. You need a little clean
>> > air to breath once in a while because if you don't turn green, the
>> > walls
>> > might.
>>
>> True, but an HRV/ERV is a better solution to this problem than is
>> leakage through the structure.
>>
>> Matt
>
> I'm currently working on a project using double 2x4 walls. It is also
> fairly common to see 2x6 walls skinned with 1" of xps. Practical?
> Sure. It costs more, but I suppose there will be a savings down the
> road. With the double 2x4, you wind up with some pretty deep window
> jambs, but the rest is straightforward.

You make that sound like a problem... it's a glorious thing! Check out
traditional buildings with thick masonry walls and note the beveled or
chamfer window reveals, sometimes with interior shutters built in. They
soften the harsh line between the bright glass and the dark interior walls.
A beautiful problem to have.
--


MichaelB
www.michaelbulatovich.ca



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