Mike Lamb Posted January 8, 2012 Report Share Posted January 8, 2012 Most of what I have researched shows perlite as a granule but I have seen some images fine as sugar. This stuff is as fine as flour. It was a couple inches thick in the attic beneath fiberglass batts everywhere I looked. 80+ year old house. Do you think it is perlite? Click to Enlarge 39.33?KB Click to Enlarge 38.77?KB Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted January 8, 2012 Report Share Posted January 8, 2012 Perlite is manufactured in many grades. Some is as fine a powder as factory-made baking flour. The fine stuff is not common for thermal insulation in buildings. It's used for cryogenics and other industrial equipment insulation and filter media. It's also used as a filtering media, including clarifying some wines. Calcium carbonate is another fine white powder used for industrial insulation. It's commonly used for insulating in-ground steam piping systems. Quote Link to comment Share on other sites More sharing options...
pete moss Posted January 8, 2012 Report Share Posted January 8, 2012 that does not look like typical perlite. It may be gypsum. Quote Link to comment Share on other sites More sharing options...
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