[Greenbuilding] passive haus article

[Alan Abrams]

re the GB advisor article:

some people recoil at the notion of large amounts of sub slab insulation,
but this is about heat loss via conduction, rather than convection loss
through walls and roofs.  Heat loss to soil is different than heat loss to
air.

Conversely (assuming you are looking at net heat loss through the building
envelope), increasing, say wall insulation, to compensate for heat loss
under a slab, requires more and more complex assemblies.  It also requires
either expanding the footprint--adding roof area, increasing tax
assessments, etc--or reducing interior area.  So there can be some
advantages to dumping some more insulation where it does not have a big
impact on other building assemblies.

the downside is that there seems to be no reasonable substitute for foam.
 My present thinking (not yet implemented) is to put the slab on the ground
where it belongs, and insulate on top of it, and cover with a floating
floor system.  let point loads penetrate as they must.

-AA


On Tue, Aug 20, 2013 at 7:59 PM, Sacie Lambertson <
sacie.lambertson at gmail.com> wrote:

> If you can open this, herewith an interesting Passive Haus article:
>
>
> http://www.nytimes.com/2013/08/15/garden/the-passive-house-sealed-for-freshness.html?pagewanted=1&hpw
>
> juxtaposed against this discussion suggesting as an alternative:
>
>
> http://www.greenbuildingadvisor.com/blogs/dept/guest-blogs/pretty-good-house
>
> Sacie
>
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-- 
Alan Abrams*
**certified professional building designer, AIBD
certified passive house consultant, PHIUS*
*certified passive house builder, PHIUS**
*Abrams Design Build LLC
*sustainable design for intentional living*
cell     202-437-8583
alan at abramsdesignbuild.com
www.abramsdesignbuild.com
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