Placing twin-yurts on a single wooden platform

[tisseyres-yurts]

We have started constructing the wooden base for our twin yurts (27m2 and 15m2) which a carpenter is making out of good quality 22cm wide wooden strips cut into 1.5m x 2m sections which will all link together and sit ontop of cement blocks. The final structure is 77m2, measuring 7m x 11m.

We want to place the yurts on top of this structure but need to come up with a way of waterproofing the yurts where they meet the floor.

The floor has 5mm gaps in between the 22cm wide planks which will allow for drainage outside the yurts.

We are thinking of adding a lip all the way round the yurts, perhaps waterproofed with silicon or are wondering whether we should cut a circular drainage hole into which the yurts would be pulled and fastened so the rain can drain away.

Does anyone have any experience of placing yurts on one single wooden platform? We plan on only having the yurts up Spring to Autumn.

Thanks in advance,

Ed, South of France