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do you know Foam Glas?

Posts: 51
Location: Middle of Germany
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I'm a real friend of foamglas. You could use this to build foamglas-bag-houses with it (instead of earth-bags). I do use it for a PAHS-system. It's so unique. It may also be possible to use for rocket mass heat stove.

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.”

Source: Ecoglas

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)
Geocell Schaumglas

US Producers:

Posts: 4154
Location: Northern New York Zone4-5 the OUTER 'RONDACs percip 36''
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Konstantin Kirsch : I am very much a newbe when it comes to geopolymers (Non-Portland Concrete etc) and Foam Glass, As far as I know, Here in the States
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 !
Posts: 1592
Location: Fennville MI
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Pittsburgh Corning appears to be the manufacturer, found information readily with a google search. And it has come up before on permies, found a couple of threads that mention it.

Looks like an interesting option.
Posts: 135
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I was reading the brochure available at the US website:


It presents some intriguing possibilities. Using it as insulation below grade for walls and under floors. Also, as a waterproof layer under a green roof.
Don't touch me. And don't touch this tiny ad:
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