I see this advice getting posted a lot so I thought I would start a thread as a warning to all those thinking of using pressure treated wood in (or around) their aluminum boats and trailers.
Apparently certain types of pressure treated wood contain copper which causes dissimilar metal corrosion with aluminum.
Below are some photos of the bottom of one of my boats. The boat was sitting on pressure treated wooden bunks that were covered with carpet. The carpet got wet and the chemicals leeched thru and corroded the bottom of the boat quite badly. All this damage happened in 1 year!
http://i438.photobucket.com/albums/qq107/ComoxSam/P1030707.jpg
http://i438.photobucket.com/albums/qq107/ComoxSam/P1030705.jpg
http://i438.photobucket.com/albums/qq107/ComoxSam/P1030700.jpg
http://i438.photobucket.com/albums/qq107/ComoxSam/P1030698.jpg
There are some people who have been using pressure treated wood with aluminum and haven't had any problems. I suspect it might have to do with a different type of treatment on the wood. The stuff I used had a tag right on the end saying not to use with aluminum. Unfortunately I didn't read it until it was too late.
I'm not saying never use PT wood on your boat but this is a warning about what could happen.
Hope this helps.
Apparently certain types of pressure treated wood contain copper which causes dissimilar metal corrosion with aluminum.
Below are some photos of the bottom of one of my boats. The boat was sitting on pressure treated wooden bunks that were covered with carpet. The carpet got wet and the chemicals leeched thru and corroded the bottom of the boat quite badly. All this damage happened in 1 year!
http://i438.photobucket.com/albums/qq107/ComoxSam/P1030707.jpg
http://i438.photobucket.com/albums/qq107/ComoxSam/P1030705.jpg
http://i438.photobucket.com/albums/qq107/ComoxSam/P1030700.jpg
http://i438.photobucket.com/albums/qq107/ComoxSam/P1030698.jpg
There are some people who have been using pressure treated wood with aluminum and haven't had any problems. I suspect it might have to do with a different type of treatment on the wood. The stuff I used had a tag right on the end saying not to use with aluminum. Unfortunately I didn't read it until it was too late.
I'm not saying never use PT wood on your boat but this is a warning about what could happen.
Hope this helps.