Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here




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.

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.

www.SlideRuleEra.net idea

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close