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I have a 30"x50"x3/4" granite slab that I would like to use for a table. I'm thinking of putting 5/8" plywood underneath (20"x40"?) and before mounting the granite on top, inserting a few T-Nuts for this type of legs: https://www.homedepot.ca/product/live-edge-timber-co--38-inch-high-x-19-inch-wide-steel-furniture-legs-pair-of-2/1001215038

  1. Are t-nuts my best option, or is there some thing else I should consider?
  2. Is 5/8 plywood thick enough?
  3. Anything to consider when cutting the plywood size, aside from wide enough for the legs, not wider than granite?
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  • Plywood is not the same as very thick live edge slab . Without any type of bracing to stop racking i think the plywood would start to de-laminate over time if racking occurs. How about a hardwood or cross bracing on the back side corner to corner between legs ?
    – Alaska Man
    May 8, 2020 at 21:16
  • I figured the slab would provide enough support so it won't rack. Would 1" hardwood be better or thicker?
    – Luke D
    May 8, 2020 at 21:39
  • "I figured the slab would provide enough support so it won't rack" You said you were using plywood not a slab. I referenced a slab because the legs are marketed for use with a slab on the HD link you provided. 1" hardwood would be better then plywood. Without bracing or securing it to a wall you will get some racking, racking over time can weaken connections.
    – Alaska Man
    May 8, 2020 at 22:02
  • Legs attached to the plywood, plywood glued to the granite slab.
    – Luke D
    May 8, 2020 at 22:04
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    Thanks, seems general consensus is that it won't be sturdy enough. I might look for an old iron table or build a base out of wood.
    – Luke D
    May 9, 2020 at 21:46

1 Answer 1

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I have a 36" X 68" kitchen island top of 3/4 granite . It simply rests on the frame work of the island, basically 3/4 plywood on edge with cabinets and drawers like typical kitchen cabinets. There are some cross members of 2" wide 3/4 plywood. The granite is loose and can be moved. I was going to do something more sturdy but have not gotten to it in 25 years. I have stood on it a few times , I keep my feet over the 3/4 on edge plywood. A good finish carpenter made the island so it is very flat. So cabinet type birch plywood should be enough.

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  • I apologize for downvoting, but this answer doesn't address the attachment of the legs. May 9, 2020 at 17:17
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    I guess I focused on "plywood glued to granite". May 9, 2020 at 19:53

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