Reply by Doss

Thickness of the top has more to do with the design than an actual spec, but you shouldn’t go too thin obviously. I’d say if you have a table that big, you’re approaching too thin around 3/4”, but I don’t know the design, supports, etc.

As Clint said, as thick as your thinnest board.

-- "Well, at least we can still use it as firewood... maybe." - Doss