Beginner Gardening: Preparing the ground for timber circular decking tiles, 0 by Diana_K

Diana_K wrote:
You probably need to protect the deck wood from contact with the ground. If the limestone provides excellent drainage, then it may be OK to lay them right down on the limestone. Otherwise you may have to set some kind of concrete piers.

How are the boards held together? If you just propped it up by the ends of the structure, would it hold? Lets just say you put 4 'legs' on one of these. Would it sag? Break?

This picture is about the worst case scenario.
If you can find out the size of lumber that attaches the boards together that may answer the rest of the questions. How strong are these supports (I have drawn them in black)? How often do they need to be supported? Are they a lumber that is approved for contact with the ground? (resistant to local pests, fungi, damage from constant moisture) If the black boards are OK in contact with the ground, then the limestone base will be enough. No need for piers or additional boards.

If the limestone is not good, level support, then use the piers. Then add the blue boards.

If the limestone drains well, and can be made perfectly smooth and level, but the black boards should not be in contact with the ground, you should provide some horizontal boards (drawn in blue) that are strong enough to support the weight of people walking around on these, and are approved for ground contact.