pressure treated problem?

[mommicked]

I recently replaced my rotten bunks w PT pine 2x4s covered in cheap in/outdoor carpet. My hull is aluminum, should I worry about the PT chems. leaching throught the carpet and damaging the aluminum?

 

[halfmoa]

Re: pressure treated problem?

I believe I beat the PT wood vs aluminum topic to death...

http://forums.iboats.com/showthread.php?t=514777

 

[mommicked]

Re: pressure treated problem?

The discussions seam to be about the "old" pt wood. I believe Its all a new type of safer? treatment now. I assumed the carpet would keep the corrosion from forming but I did also find the wettest most heavy studs I could find in the stack, noticeably more than the rest, and did'nt dry them.

 

[minuteman62-64]

Re: pressure treated problem?

The discussions seam to be about the "old" pt wood. I believe Its all a new type of safer? treatment now. I assumed the carpet would keep the corrosion from forming but I did also find the wettest most heavy studs I could find in the stack, noticeably more than the rest, and did'nt dry them.

Actually, the new stuff is more corrosive than the old stuff. It is supposedly environmentally safer, but hell on fasteners.

 

[zopperman]

Re: pressure treated problem?

Is it CCA or ACQ?

CCA = orange-ish and OK
ACQ = green HD stuff and BAD!!!!

I wouldn't risk it even if it's covered.

 

[bigdee]

Re: pressure treated problem?

Actually, the new stuff is more corrosive than the old stuff. It is supposedly environmentally safer, but hell on fasteners.

Correct the new stuff is not only evil but is not as rot resistant as the old stuff. I have structures built over 25 years ago with the old PT that is more solid than the deck I built 8 years ago with the new PT. I would just use regular pine for the bunks...in my experience it will last almost as long as the PT anyway.

 

[mommicked]

Re: pressure treated problem?

Hds website says MCA or micronized copper something. Is that good or bad? will the carpet help or should I remove and replace or add some barrier like rubber between the wood and carpet on the top?

 

[zopperman]

Re: pressure treated problem?

Copper is bad... dissimilar metals = corrosion, I believe.

 

[a1nowell]

Re: pressure treated problem?

I did find the chemicals leaching through the carpet on my tritoon trailer. This is what I did to all my bunks to solve the problem.

http://www.wholesalemarine.com/p/T-D-86164/Boat+Trailer+Bunk+Slick+Kit,+10+piece.html

 

[Home Cookin']

Re: pressure treated problem?

your trailer bunks are usually dry and covered by the boat, so you don't need pressure treated in the first place. If non-treated wood lasts 8 years and pressure treated lasts 15 years, is it really going to matter?
I doubt the hull will know the difference through the carpet, but I see that others disagree and have seen issues. You also have issues with fittings. So if you are concerned, get non treated and replace in 8 years--it's not like it's a stringer under a deck.

 

[Texasmark]

Re: pressure treated problem?

I have had to replace untreated wood that was carpeted on several boats. I never have had to replace a treated pine bunk that I left bare. I currently have an alum boat sitting on PT pine bare bunks and have had it since 2004. If it is corroded I can't find out where.

We all live and do in different environments in different ways with different things. What I do may or may not be what is right for you. Read all the replies, make your choice and go with it. Best advice I can give you.

Mark

 

[a1nowell]

Re: pressure treated problem?

Mark,
It was around 2005-2006 that the treated lumber went from cca to whatever it is now. The old cca was not so corrosive.

 

[zopperman]

Re: pressure treated problem?

I'd use treated bunks on fiberglass. I wouldn't chance it on a tinny eek

I'd go with a FIR.. covered in carpet...

Paint it or seal it with epoxy if you are really worried about rot

 

[mommicked]

Re: pressure treated problem?

Thanks for all the advice guys. I'm gonna jack the boat up and see what it looks like where it's been sitting on the bunks. I assume copper corrosion would cause staining to occur to the aluminum first?

 

[bigdee]

Re: pressure treated problem?

I pulled my boat out of the water today but before doing that I inspected my trailer and found that the 1/4" carriage bolts securing the bunks were loose. I got out my wrenches to tighten them and on the first try it snapped off...the diameter of the bolt that was inside the wood was about the size of a match stick! I quickly checked the rest of the fasteners and found them to be the same. The bunks are several years old but still solid so I peeled away some of the carpet and sure enough...PT wood.

 

[cyclops2]

Re: pressure treated problem?

I Pick thru a LOT of H D untreated pine boards for the 16' Lowe alumimun boat. The bolts ARE 3/8" SS. The trailer is a 1988 Galvanized. Only replaced boards 1 time. Picked the straightest & HEAVIEST boards in the pile, with lots of center growth rings. Been about 8 years on this set.
No carpets on any of my trailers.

 

[Mark42]

Re: pressure treated problem?

Yep, pretty much beating a dead horse at this point. The facts are facts, and outside of a few isolated situations, the vast majority of people get along with pressure treated and aluminum with no issues. If you are really worried, buy a bicycle inner tube and cut it to fit the space between the pressure treated wood and the aluminum or galvanized steel supports. Then call it a day

 

[zopperman]

Re: pressure treated problem?

Yep, pretty much beating a dead horse at this point. The facts are facts, and outside of a few isolated situations, the vast majority of people get along with pressure treated and aluminum with no issues. If you are really worried, buy a bicycle inner tube and cut it to fit the space between the pressure treated wood and the aluminum or galvanized steel supports. Then call it a day

yeah sheesh this thread needs to die