Jwb5858 0 Posted April 3, 2017 Report Share Posted April 3, 2017 I've got hardboard siding that's giving me fits that I would like to identify. The markings on the back are "USP 3 347 85 C". I think it might be USPlywood manufactured at Catawba SC but I'm not certain. It's swelling, edge checking, and pretty much disintegrating where any moisture hits it. I've kept it going with heavy coats of paint but it's going to have to be replaced. Any help in identifying this would be appreciated. Quote Link to post Share on other sites
Jim Baird 27 Posted April 3, 2017 Report Share Posted April 3, 2017 Photos would be a big help. Quote Link to post Share on other sites
Jwb5858 0 Posted April 3, 2017 Author Report Share Posted April 3, 2017 Here's are a few pics. What's odd is the number has a backwards C at the end. Since the stamp was upside down, I missed that clue. It looks like a distinctive design. I haven't seen any others quite like it before. Hope this helps. Click to Enlarge 65.19 KB Click to Enlarge 69.73 KB Click to Enlarge 45.93 KB Click to Enlarge 42.26 KB Click to Enlarge 53.1 KB Click to Enlarge 72.37 KB Quote Link to post Share on other sites
Bill Kibbel 74 Posted April 3, 2017 Report Share Posted April 3, 2017 I have old notes about hardboard siding settlements that says USP stamped on smooth backing is Catawba by Georgia-Pacific. Quote Link to post Share on other sites
Jwb5858 0 Posted April 4, 2017 Author Report Share Posted April 4, 2017 That looks like a direct hit. The date also matches. House was built in 86. I assume any compensation from GP is out of the question. Thanks for the info! Quote Link to post Share on other sites
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