Thread: Check your bunks

I replaced the bunks on my tracker after 13 years of use. The reason the bunks aren't made of pressure treated wood is that the chemicals used to pressure treat the wood will leach out and cause corrosion on the aluminum. That's what the good folks at tracker told me. Take it for what its worth.

bought a 2011 Lowes pontoon and after putting it in water for season noticed one of the bunks was totally mush and will have to be replaced. Oh well something that will take care of this summer.

If the whole corrosion thing is true then I wonder if it's still a problem since they changed the chemicals that are used to make pressure treated lumber. Not the same process anymore.

Ok. After reading a few articles on the web everyone is saying to avoid pressure treated against bare aluminum. One guy even stated that local building codes have gone against allowing aluminum flashing at decks for this reason. Looks like I will be getting some of the composite deck boards and going that direction.

This is from one of the articles:
"The aluminum flashing corrodes because of contact to wet, pressure-treated lumber. The chemical used to treat the wood is chromate copper arsenate (CCA). The copper in the chemical reacts with the aluminum in a galvanic reaction that corrodes the aluminum. The corrosion is accelerated in the presence of moisture. When the deck boards are laid tight, water is trapped on the flashing and the area rarely dries out. CCA treated lumber production was phased out in 2003-2004, primarily because of the arsenic in the chemical. The chemicals used in newer treated lumber are even higher in copper and because of the likelihood of more aggressive corrosion, aluminum is not recommended for flashing in contact with pressure-treated lumber. Currently copper, stainless steel, or non-metallic flashings are recommended to prevent galvanic corrosion."

https://donan.com/knowledge-base/art...ed-wood-decks/

The chemicals used in treated wood are harmful to aluminum