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tallway

07:14PM | 04/08/03
Member Since: 04/07/03
2 lifetime posts
Bvmisc
I would like to install a deck over my pond. (the pond isn't full yet) the size would be approx. 12x14. Would I be better off using treated wood post, pvc drain pipe filled with concrete, or a combination of both? I would like to keep the number of post in the pond to minimal, what's the least I can use and still have a sterdy deck?

treebeard

02:18AM | 04/09/03
Member Since: 01/14/03
265 lifetime posts
While a concrete filled pipe will last longer than the wood, the treated wood will be easier to attach bracing to, and you will want to brace the posts to the deck frame. I'll assume that your pond is one you've built and there are no wetland or environmental issues here. If your pond is not yet filled with water, and you have access to the pond bottom where the posts will be located, then you might try excavating holes in the bottom and installing a Sono Tube in each hole and then filling the tubes with concrete. Set them so that the top of the tube (and thus the top of concrete) will be 4-6" above the water surface, and then set your treated wood posts on metal shoes anchored in the top of the concrete. The depth of bury for the tubes will depend on how large the pond is and how large an ice sheet may be there in the winter. If this is a hand dug pond, the sheet will be small and won't move much, and therefore won't exert much pressure on the concrete filled tubes. So dig your holes at least 2 feet below the pond bottom to good bearing on gravel. If the pond is not hand dug, and is large (measured in acres) then your holes in the pond bottom will need to be 4 feet or so, and into good bearing on gravel. And ice sheet on a large pond can move a lot of things. Of course, if you're dealing with a larger natural pond that you didn't make yourself, we'll have to assume that you've done your homework on the permitting issues.

As to your other question, the number of posts depends on the location of the deck. Assuming the one edge rests on the shore, then you should only need 2 posts to support the ****hest edge out oveer the water. If your deck is entirely over the water with some other form of access to it, then you'll need 4 posts. One at each corner, with knee bracing back to the deck frame in either case.

tallway

05:15PM | 04/10/03
Member Since: 04/07/03
2 lifetime posts
The pond is about 1/2 acre and will be approx. 12' deep. We're in Ohio so we will get ice. What is a sono tube? Is it the same as a tube form. Also can I make my post all concreate and use a direct bearing hardware with the beam attached directly to it?

treebeard

01:44AM | 04/11/03
Member Since: 01/14/03
265 lifetime posts
A sono tube is a heavy duty cardboard tube used in construction as a concrete form for cylindrical post and piers. They are available in a variety of diameters (8, 10, 12, 14", etc.) and number of lengths.

And yes, you can make you posts concrete from top to bottom. The key will be to install the tubes with sufficient bearing and bury at the bottom so that the weight of the concrete doesn't make them sink at all. They must bear on good comapcted gravel. The tubes must be the right length. And you'll need to build a framework to support them in place until the concrete sets up. The framework will need to keep the tubes plumb and level. Once they're filled with wet concrete, and before the concrete sets up, if they begin to settle or shift or twist or fall out of plumb, there's very little you can do but remove them and do it all over again.

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