I found a video on YouTube for a very simple to make canopy. My questions are would it be better to use 1/2" or 3x4" plywood and is it ok to use pressure treated?
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I made a great canopy for my 150 long (72x24x21) out of 3/4 ply. The only problem I had with it was that it weighed in at about 900 lbs - or at least felt like it. Had it ever fallen on me while I was working on the tank I would have broken a bone or three.
I would not use 3/4 plywood!
When I made the canopy for my standard 120 I remembered the downside and planned accordingly. I used 3/4 solid cherry for the corners and frame but used 1/4" cherry for the panels. I can pick this one up one handed.
Use the thinnest material you are comfortable working with. DO NOT used treated lumber for any of the build. It is notoriously wet and therefore subject to warping/twisting as it dries. Although I assure that you'll be sealing the whole thing anyway with paint or stain, I'd also be concerned about it leaching things into the tank.
Thanks I havent made it to HD yet I was just looking on their website. I will be going there tonight or in the morning and I'll head to the interior section. The video I found is a frameless one so I'll be going with 1/2"or 3/4"I think you might be looking in the wrong location. If you're at one of the big box stores (e.g. home depot or lowes), one aisle will be interior and the other is largely exterior and treated products. Usually the exterior aisle is either the outermost or second to outermost aisle with the interior wood products one aisle closer to the center of the store. Plywood sheeting would work fine. If you're going to paint, go plywood 1/4-1/2". If you're going to stain, I'd go with a nicer wood, I've done cherry and oak canopies. If you're at a lumber yard, explain to them your project and they'll take care of the rest If weight is a concern, you can build an internal frame and skin in 1/4" wood. If you don't want to do a frame, 1/2" is easier to work with.