|Forum topic by Erythronium||posted 03-13-2008 06:16 PM||19989 views||0 times favorited||3 replies|
03-13-2008 06:16 PM
Anyone know good web sites, references, contacts to help identify treated lumber, not new lumber which should be labelled, but salvaged wood that may be several decades old? Creosote is fairly obvious, but older CCA (copper chromium arsenic) treated wood is often not (newer looks greenish). Also concerned about “penta” (pentachlorophenol) which has been in use since roughly 1930’s and I don’t know that it can be visually identified in wood. Also “deca”, and other less common treatments.
Anyone know of affordable testing sources to determine presence of treatment chemicals in wood? Are there fairly simple DIY tests (web site describing tests)? Spoke with an MSU (Michigan) wood tech professor, said CCA treated wood will show green flame, but need special flame (green = copper as I recall).
Been all over the web for 2 days, not finding exactly what I’d like. Probably out there, just so vast.
Ran across LumberJocks site looking for web site to identify tree species by wood sample. Thank you for the good reference to the hobbithouse site. Apparently no government agency like USDA has visual wood/lumber identification site, which is surprising.
Immediate concern is tearing down old corn crib (dating about 1950’s-60’s I guess). Like to reuse the wood rather than bury it as most do around here, or burn treated wood, or landfill it. Vertical posts are probably treated and will be reused on farm structures here. If non-treated, some wood will be burned in woodstove. Horizontal planks appear non-treated, but different, like maybe Bald Cypress (??). Being a northerner, haven’t run into it, but understand it was widely used for structures, even to line water wells. If horizontals are unique wood, I’d save for woodworking, structures, or sell.
Long-term concern is that I work with Amish friend to salvage old barn wood. Hand-hewn beams, poles are obviously not treated (other than sometimes white-washed), but we also work on newer structures, or run into newer wood patches on older structures. Most around here in farm country couldn’t care less about burning treated wood, or something unique like old Tamarack (Larch) poles. We try to sort that out, do the right thing, not send out arsenic smoke for everyone to breathe, and not waste uncommon wood types to the woodstoves.
-- Bill, Marlette, Michigan, firstname.lastname@example.org