Mike Lamb Posted March 5, 2018 Report Share Posted March 5, 2018 (edited) I ran into this Pyrobar stuff the other day. It was lining the floor beneath a back porch. I did some research and it was a fire proof insulator used around structural members but also used to build non-bearing walls. The mortar used for this product probably contains asbestos and workers often cut it with a saw. Here are some links if anyone is interested: https://archive.org/details/PyrobarGypsumTile Edited March 5, 2018 by Mike Lamb Link to comment Share on other sites More sharing options...
Bill Kibbel Posted March 5, 2018 Report Share Posted March 5, 2018 I've come across it a few times. Boiler room ceilings, stair and elevator towers. Tests showed it contains a very small percentage of fibers, surprisingly from wood. Link to comment Share on other sites More sharing options...
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