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Name of insulation?

Mike Lamb

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In my experience, there were 2 types of fiberboard used for backing plaster.  One is made from the waste fibers from processing sugarcane.  This was the original product of the Celotex Co.  The other is made with wood fibers.  What's in he picture is likely the latter.

The appearance (large, long coated fibers) and building age leads me to think it is Universal Insulite.  It was a popular brand.

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