Peter Daly Posted March 26, 2010 Report Share Posted March 26, 2010 Can anyone identify the product shown in this photo. It's a 3/4 inch fiberboard with a thin asphaltic layer on each side? It was used as an underlayment over studs and under stucco on a house built in Menlo Park, CA in the 1960's Click to Enlarge 58.42 KB Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted March 26, 2010 Report Share Posted March 26, 2010 I'm not sure if this will help out any: http://www.inspectapedia.com/structure/ ... athing.htm Quote Link to comment Share on other sites More sharing options...
kurt Posted March 26, 2010 Report Share Posted March 26, 2010 It may not be "celotex", which is a trademarked brand name, but it's your basic celotex sheathing. Fibrous interior, asphalt impregnated 2 sides. Quote Link to comment Share on other sites More sharing options...
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