Re: Transom wood

[mr-asa]

quote JoeCB:

The older pressure treating chemicals were copper – arsenic based chemical compounds. Copper and aluminum don’t play together nice in wet environments. They are using something different these days, not sure what or if friendlier to aluminum. I do know that the deck builder guys had to switch to stainless steel or plastic coated fasteners cause the new stuff was eating steel fasteners.

Joe B

Still copper, its just the other chemicals are different. That’s why new stuff also has the green coloration

I want to say that the old stuff used a copper-arsenic base?