Treatment specification

[swine]

Hello,
Copper arsenates are no longer being allowed. So, what is appropriate timber treatment for bridges over waterways? Is creosote allowed at all?

My understanding is that creosote has been replaced by the various copper compounds. But isn't copper harmful to aquatic environments? And why is copper so harmful to aquatic environs. What have you been specifying, the last project we did we used ACQ, should I stick with this? I really don't feel like I have the time or the budget to justify extensive research into the latest environmental documents, so any input is much appreciated. Thanks.

 

[JAE]

I would check with your local state DOT or whatever government bridge division that exists in your area. They usually develop their preferred specification for bridges and these usually have been cleared by the prevailing ecological and public agencies.

 

[SlideRuleEra]

CCA has been phased out for residential and general consumer use, see this link

http://www.epa.gov/oppad001/reregistration/cca/alternativestocca.htm

CCA is still allowed for industrial use, such as bridges, see this link

http://www.osmose.com/wood/usa/articles_press_releases/cca_announcement.asp

Creosote is still allowed, see this link (about half way down)

http://www.awpa.com/references/faq.asp

http://www.SlideRuleEra.net

 

[swine]

I talked to the suppliers and CCA has been phased out of the market.

Looks like the consensus is ACQ?

 

[PEinc]

My lumber supplier confirmed what SlideRuleEra said.