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Creosote
2

thread158-485135

Creosote

Creosote

(OP)
We are executing a project requiring the replacement of stop logs at the water intakes. What is a suitable replacement(= to or greater than) creosote lumber? Creosote was specified in the engineering but has a 4 mo. turnaround which is not feasible for our schedule.
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RE: Creosote

There are several wood preservatives that, at the proper treatment level, are considered equal to creosote. The best one, IMHO, has a long proven track record: Chromated Copper Arsenate Type C (CCA). Under the "old" way of specifying pressure treated wood, you probably want at least 0.80 lb/ft3 retention for stop logs. (Higher is better, 2.5 lb/ft3 if you want them to last "forever"). CCA may have limited availability since it is no longer allowed for use in residential projects or indoors. Under the the "new" way of specifying treated wood, probably at least UC-4C. The cost to go to a higher treatment level is often nominal. Also be careful about which wood species is used. Not all accept preservative well. Southern Yellow Pine is very good.

For other options, see AWPA Standard U1.

FWIW, I would go with 1.25 lb/ft3 or UC-5C.

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