In reply to Rob Laird: 150mm horizontally. some folks like the diamond shape approach which I have successfully used.
It does not want to show dot patterns sorry (alternate starting point!)
I have done the square approach too at 150mm all round
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I had a wee patch I tried just to see 100mm and often t-nuts are unusable.
I'd say it depends on the angle of your wall. Steeper probably means larger holds, so 150mm c/c is fine, 250mm is too large. I have 100mm c/c as it's quite a shallow angled wall and has mostly smaller holds and screw-ons. Doing it again, I'd probably go for 150mm, diamond offset, as Erick mentioned above.
In reply to Rob Laird:
As people above have said I think 250 is probably a bit too big. I went for 200mm which works well but I have quite a big board (12ft x 13ft). For a smaller board I suspect 150-200 would work.
I would suggest *maybe* erring on the larger side to allow room for screw-ons (bought or home made). If you can, aim for at least as many screw-on holds as you have bolt ons to make it interesting, especially if your board is going to be at less than 35-40 degrees. My 2p's worth anyway.
In reply to Rob Laird:
Oh, and don't underestimate the importance of a kickboard (slightly less of an issue for shallow/vertical walls). Go for absolute minimum of 8 inches, ideally 12-18".
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