Base under flag stone?

Hi - I have a 500 sq ft area of DG that is crumbling to mush and am considering installing a flagstone patio, but have a couple questions. I'm trying to keep the profile of the flagstone/ sand as low as possible as the DG is currently level with a small lawn and borders:

** Can I use the DG as a sub base?
** If so, the DG is 4-6 inches thick. How little sand can I get away with between the DG and the flagstone? I'm planning 2 inches, but since I'm trying to keep the profile low I'd really like to do less unless this is a stability issue. It freezes 1-2 nights a year, so barring an earthquake things should be pretty stable.
** The DG already has weed barrier beneath it (4 inches down) should I put another layer of weed barrier on top of the DG? Seems like overkill but who likes to weed...?
** Can I use 1 inch Conn Bluestone, or is 1.5 inch a better choice?

Apologies if I've missed answers elsewhere, and thanks in advance for your advice.

I'd use the 1 1/2", they will move less, but cost more. You need 2" of sand because noting is perfectly level. If you didn't have weeds growing up before you will not now, but weeds will sprout from the sand in between the slabs.

Here is a link that might be useful: Propagating Perennials

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RE: Base under flag stone?

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