Last year Owen Geiger wrote in his geopolymer-blog after a contact with me:
Foam glass gravel is being used in Germany and other parts of Europe in much the same way as scoria and pumice in the US. The limited information I’ve found is mostly translated from German. Foam glass gravel would work great in earthbags. And since the closed-cell product does not absorb water, it remains a constant weight. The foam glass powder can be mixed with plaster, used in lightweight insulating floors and roofs, etc.
“Ecoglas® is a high quality recycled product consisting of 100% recycled glass and thus meets the highest quality requirements with outstanding properties.
5 arguments for foam glass: environmental, thermal insulation, waterproof, pressure-resistant, dimensionally stable. [Ed: more reasons: lightweight, fire resistant, rot resistant…]
Millions of pores therein and the permanently trapped gases provide for a high insulation value. The dimensional stability and high internal friction value make for enormous compressive strengths. Ecoglas® is absolutely free of pollutants and has an excellent energy balance.”
Compare this product to expanded clay granules.
Note from Konstantin, a reader who tipped me off about foam glass: There are several producers of foamed glass gravel in Germany and Europe. Maybe there are some factories also in USA. Very crazy is that its super light. Only 100 to 160 kg per cubic meter!
Look at these sites:
Foamglass core wall insulation info
Konstantine’s blog post about his visit to Ecoglas
Misapor (best site, plus it’s in English)
we are still not using Recycled Glass during manufacture! (Glass Re-cycling otherwise is a major success story) I have not spent much time researching
on these materials..
Foam glass is a more highly insulating man-made material than Pumice or Scoria, doing more with less, and capable of providing insulation under Concrete slabs,
And perimeter drainage, while eliminating Thermal bridging. Cost and the present (?) manufacturing Techniques seem to be it biggest draw backs ! Thanks for
sharing the link, It will take time to absorb ! For the good of the Crafts ! Big AL !
Late Note : I did a quick search for Foam glass gravel and all of the links i saw were for Europe !
Live a little! The night is young! And we have umbrellas in our drinks! This umbrella has a tiny ad:
For the Love of Paw Paws Mini Manual - Kickitty-Kickstarterhttps://permies.com/t/76624/Love-Paw-Paws-Mini-Manual