FFrankie
Not to be the bearer of bad news but plywood will compress under pressure. I'm not worried about it shifting around but compressing. It's not pressure rated with anything remotely NEAR that much weight. Believe me when I say that... this is what I do.. that's the business I am in... Plywood has very minimal resistance to any compression because that's NOT what it is made for. A pressure of approximately 35lbs PSI applied to it over a time of 1 week will permanently leave an impression (Deformation) in the plywood. Imagine putting the weight of your whole tank on it for much longer periods of time. If the plywood compresses at different amounts (knot hole plugs are MUCH more dense so one here and there would account for varying amounts of compression) along the bottom frame of the tank you could indeed have some slight warpage. If the main frame has ANY warpage that could stress the tank and I think we ALL know what can happen if stress is put into the glass in a way that it's NOT designed or accounted for.
stilgore since you don't have plywood under your stand you don't need to worry about differential compression causing a problem. Just be sure to check it a couple of times a year for problems (maybe make a note to peek at it when you change your smoke detector batteries twice a year). The concrete is indeed porous and will wick moisture from the ground and up into the wood contacting it. The more arid your environment the better.
Excellent set up and I can't wait to see it filled with your goodies!!
Allen
Quote:
Originally Posted by FFrankie  I thought i mentioned the concrete issue. It's on page 6 here. I think you will be ok though for some time with it as long as you keep it dry. Pressure treated ply won't move over time with a 300 gal. tank full of water on it AL. Thats going to be over 4000 lbs.
Nice repair Stilgore! Good luck with the fill. I would wait a week for it to cure. |