Poor Man’s Thermomass
The previous conversation got off on a tangent about material costs and PWF… There was not much uptake on my “Poor Man’s Thermomass” idea: https://www.greenbuildingadvisor.com/sites/default/files/poormansthermomass.jpg
Since drawing that detail, I have thought about replacing the EPS with rockwool, and have done some research on what the backerboard could be. I understand it can’t be Hardibacker or Durock. Perhaps there is another subgrade cementitous board which would be applicable?
I see Finex are OK for ground contact (http://gofinex.com/en/fiber_cement_panels_finex.php#ground). I also looked into T-Clear Wallguard (http://www.tclear.com/products/wallguard/) which is a cement board fused to insulation. They told be that the rockwool version is not suitable to below grade applications, but I wonder if this is in line with the new thinking of below grade rockwool…
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