[Greenbuilding] passive haus article

[John O'Brien]

On Wed, Aug 21, 2013 at 8:50 AM, John F Straube <jfstraube at uwaterloo.ca>wrote:
>
> I recoil at the notion of large amounts of insulation (even 4" of foam is
> a lot) under the slab because it does not save much energy, unless you use
> some weird energy model that does not relate to measured sub- slab
> conditions. The soil simply does not get that cold below slabs on grade or
> below basement slabs and it IS the temperature difference between the soil
> and the indoor air that drives heat flow.
>
>
Off topic slightly John. But do you know if anyone has done any modeling of
the effects of running a ground tempering loop (Incoming HRV pre-temper)
under an insulated slab on grade. I had been thinking about that recently,
but wasn't sure if that would mess with the frost lines.


> See for example drawing attached (PS. I would be tempted to either use a
> fully-adhered air-water barrier or seal the joints in the OSB to make a
> rigid air barrier, or use ZIP)
>
>
>
>
>
In the wall section above, I would assume that if you went peel & stick at
the exterior sheathing layer, you would drop the vapour control (poly up
here).

Also, another unrelated, but somewhat related question. In the testing you
did with regards to furring and exterior insulation, would horizontal
furring hold up the same, or would you recommend just tossing cross battens
onto the vertical furring.

J
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