wingfoot Posted July 14, 2006 Report Share Posted July 14, 2006 Can anyone tell what type of siding this is from the stamp on the back? The house was built in 1988, so I am assuming the "88" is for the year manufactured. Sorry I didn't get a close up photo of the front, but I guess I am correct that it is one type of composition hardboard. The stamp reads; "1 050 88 OSP C" Download Attachment: Siding.jpg 182.58 KB Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted July 15, 2006 Report Share Posted July 15, 2006 Originally posted by wingfoot Can anyone tell what type of siding this is from the stamp on the back? The house was built in 1988, so I am assuming the "88" is for the year manufactured. Sorry I didn't get a close up photo of the front, but I guess I am correct that it is one type of composition hardboard. The stamp reads; "1 050 88 OSP C" I've been told that all of the Masonite siding products had a screen-like texture on the back side. If this stuff was screen-like on the back it might be Masonite. If it's smooth, it's probably another hardboard manufacturer. Sorry I can't be of any more help. - Jim Katen, Oregon Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted July 15, 2006 Report Share Posted July 15, 2006 It looks like USP on the stamp. There was a company named "US Plywood" that I think was acquired by Georgia-Pacific. Maybe you can find something helpful here: http://www.sidingconsultants.com/IDENTIFY.HTM Quote Link to comment Share on other sites More sharing options...
wingfoot Posted July 15, 2006 Author Report Share Posted July 15, 2006 Thanks Bill, That web link you gave had the information I needed. "Catawba Siding manufactured by Georgia-Pacific has a smooth back and may be identified by one or more manufacturing stamps or numeric codes like those illustrated below: A numeric code that may contain the letters "GP" or "USP" for example: 2 21: 38 257 89 GP 2 21:38 257 87 USP 13:25 365 96 GP 07:11 10 04 96" It appears it is Catawba siding. I usually don't go to this much trouble identifying what brand of siding it is but I had such a good look at the siding from behind I figured I would try and track it down. BTW, this house had Polybutylene PB2110 as well but the current owners had the whole house re-piped with copper at no cost from the class action. It seems anytime I inspect a house from the mid-80's to mid-90's around my area it usually has the double whammy, PB & or some type of composite hardboard. As always thanks for the info. Quote Link to comment Share on other sites More sharing options...
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