Would Pool Krete be an acceptable option for insulation on a mass heater? It is filled with vermiculite and cement and seems to be a possible, solid option for insulating the riser. Think it's a possibility?
Jon Lim : Not to throw the baby out with the Bath water ! Lets look at this a minute ! Where there are problems there are solutions !
A quick study of the articles provided by Max will show you the basic Portland-type cement problems. There exist different types of non-Portland
cement Called Geo-polymeres that could be, I Think, used in a vermiculite, or perlite mix. Also sodium or potasium silicate (water glass)
can be used as an additional stiffener of traditional materials used in making Heat Risers.
If A high temperature geo-polymer type cement (glue may be a more accurate term here ) was mixed with vermiculite then further research
could find us a new type of insulating material, I would expect it to end-up costing more, and much more of it being needed to provide similar
amounts of insulation !
This is coming from a man who has repeatedly warned against portland-type cements (almost all concrete made in the Americas is Portland )
and is very close with a buck ! Big AL
Success has a Thousand Fathers , Failure is an Orphan
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Location: Southern alps, on the French side of the french /italian border 5000ft elevation