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Location: New Jersey
When I built mine 15 years ago, full 1" thick melamine with both sides was available, which is what I think the plan called for, I got it at a specialty plywood/sheetgoods wholesaler, and it held up well. If doing my own lamination, I'd do just one side, and put some shellac or poly on the back side to seal it.
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Location: Wapakoneta, OH
I did, though I question why. That said, mine (now 14 years old) has held up extremely well and is still flat. If you have a Habitat restore anywhere nearby, you can get laminate really cheap from them. One thing I noticed is that laminate now (at least what's at habitat) is a lot thinner than the Formica I bought 14 years ago.
I started with absolutely nothing. Now, thanks to years of hard work, careful planning, and perseverance, I find I still have most of it left.
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The old plans called for 1" melamine which no one could find. I made mine with plywood and laminated one side---that was over 20 years ago with no problems. You might consider making it so it's the same height as your table saw--makes a great out feed table.
Dave
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Another option is to use phenolic plywood. Very nice stuff. Woodcraft sells it, or used to; haven't been in one in a long time.
John
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I've had my Norm-style router table for about 10 years. I used the 1" double-sided melamine but if/when I build another one I will use laminate on the top only and poly on the bottom side.
If I had 8 hours to cut down a tree, I'd do it in 15 minutes with a chainsaw and drink beer the other 7:45 hrs.