Hi Jason,
Thanks for the e-mail the other day with the PDF link. Now that I'm not on the road I hope to look into that cement mixture more.
Regarding PVCX, I highly recommend you learn to work with the 1/4" for cages. For racks I think the greater rigidity of the 1/2" material makes it well worth the extra money, especially if the rack would be used for small colubrids and/or live bearing snakes with small young.
But for cages the 1/2" material really does not save that much weight over 1/2" plywood, at least according to the listed shipping weights for both products. Given the appearance and value of a nice laminated plywood I'd be hard pressed to choose a plastic over it for cages.
For cages up to 4'x2'x3' (lxwxh) I think the 1/4" material can be made to work.
I could go on an on, but in a nutshell I'll say that with a plastic welder you should definately go with the 1/4".
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Just a question for anyone who makes cages from PVCX sheets for their own use or resale: what thickness do you typically use? Is bracing required once you get over a certain size?
I'm always toying with different methods of construction for my own cages and would buy some sheets to screw around with but was wondering what the "norm" was. I own a plastic welder and am proficient with it (one of the few things I learned in public school 15 years ago).
Thanks in advance.