Pressure Treated Wood around Pond

bernd ny zone5December 4, 2010

Can someone please tell me if I may place two pressure treated 2x4s (from Home Depot) on top of my small 4x7ft outdoor pond. The pond contains only goldfish. It will be part of frame and support of a removable screen, placed there against herons. The present one is rotting away.

I thought I read somewhere that the present treating of wood is non-poisenous.



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Bern, consult the wood guy wherever you plan to purchase the wood and confirm that it is the environmentally friendly lumber that they have before you buy. I use it on my ponds.

    Bookmark   December 4, 2010 at 9:27PM
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ccoombs1(7B SC)

Treated wood is no longer as harmful to humans because they eliminated arsenic from the formulation, but it still contains copper which is toxic to koi and goldfish. It is more toxic under certain water conditions. Here's a link that explains more. I think I'd look for cedar, cypress or redwood posts instead.

Here is a link that might be useful: copper and koi

    Bookmark   December 6, 2010 at 1:22PM
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bernd ny zone5

Thank you pondmaninal and ccoombs1 for your guidance!
With my painted wood frame carrying a black plastic net finally broken and rotted, I need to replace it in spring with something more permanent to keep herons and leaves out. This is positioned above the water, with only rain water wetting it. I would stain black any wood, being it cedar or pressure treated. My experience with cedar is that it will rot away after 10years as a fence, after 20 years when painted.

I have to look into using composite deck material, that should be lasting forever. Otherwise any of the above when painted should be OK, since rain only occasionally will wash out any copper, especially not when painted.
Thanks again!

    Bookmark   December 6, 2010 at 3:57PM
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Nevermore44 - 6a

I have a 2 year old pond (16 x 8ish) that i build up against an overhangin deck and pergola, then I built a bridge over the middle... all out of pressure treated lumber. So a good amount of ptl is over the actual water. I stained the whole thing with a semi transparent stain on the visible surfaces only.

From my overall experience the only issue I had the entire first year was that the algae took a really long time to take hold on anything. I suppose it was a combination of a new pond, so the nitrates would be low and the copper leaching.... And that really isn�t too much of an issue really. From the copper test readings, it never got even close to being a health issue for the fish either.

So I would say, a beam or two would be fine. And painting or adding any sort of sealer will slow the leaching if you are concerned.

    Bookmark   December 14, 2010 at 3:33PM
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bernd ny zone5

nevermore, Thanks for the advice!
Going back to HD and Lowe's I noted that composite decking cut in strips is good to use too. Coming spring I will be able to make a frame for a removable screen.

    Bookmark   December 15, 2010 at 5:47PM
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Nevermore44 - 6a

Here is a shot of the pond last fall. We have a 2 year old, so i built a wooden frame over the pond in sections then secured the wire fencing on the underside. Each section hinges up so i can access the pond/plants if needed. And each section is locked down, so no one can get in.

Now this wouldn't be a good method for cranes.. the fence is strong enough to hold a adult up out of the water if needed... so a crane could just walk around picking off the fish through it.

    Bookmark   December 16, 2010 at 8:37AM
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bernd ny zone5

This is a neat design you have there, will save the picture! Removable sections, might do that too, is a great idea. My 7 year old grandson once fell into the pond when he was younger, only 18 inches deep, was standing in it, but I was right there. Your protection for your 2 year old is really important.
I am using black plastic netting with smaller openings, so a heron would not be able to get fish through it. The border of my little pond has some rocks, why I left some of the netting billowing up somewhat probably tripping a heron, they stay away now.

    Bookmark   December 17, 2010 at 8:36AM
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Can I use treated timber on the top edge of my koi pond just above water line ?

    Bookmark   September 26, 2011 at 3:13PM
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