[Ferro List] dougs fc parabolic video

[Peter Payne]

Hi Doug,
Thanks for the info.
Yes, modeling the thermal performance is hard. What program are you 
referring to, from Oakridge?
A friend of mine recently built a Yurt-type structure with 12 inch walls 
made from a straw-clay insulating mix, which probably performs similarly 
to foamed concrete; the thermal performance was great. Even in the depth 
of winter (25 below), the unoccupied house maintained a constant 65 
degrees with hardly any fluctuation, with one small fire a day in the 
woodstove.
When finishing the surface, what are you looking for? What kind of 
timing is involved in the finish treatment?
Is there an issue with the mortar staying workable long enough to trowel 
on the whole batch?
I'm mostly working alone without helpers--wondering how the timing will 
work.
Peter

Doug Lacy wrote:
> Hi Peter -
> (snip)
>
>  The thermal performance of the wall shell by itself is a complex thing to model.  I really worried about the first house and how it would compare to its counterpart for a winter season.  It did well by using only one small tank of propane instead of two as did the standard insulated masonry counterparts.  Someday we will be able to invest in a thermal model program from Oakridge National Lab.  I think the thermal performance will surprise a lot of people on how well it can conserve heating and cooling.  If it fell short on insulation for a cold climate, the EIFS system on the exterior would take care of it.  EPS foam or sprayed foam on the outside and then a thin fiberglass mesh and polymer modified cement shell.
>
> Doug
>
>   
>