[Bexter]

Yes I agree with using it between the soil and the infill area....

What I believe is that the fabric (by becoming clogged) could cause the infill area to become saturated and will increase the hydrostatic pressure.... could cause big problems.

[Stonehenge]

That's interesting...I've sat on both sides of the fence on this issue. And sometimes on it.

I really liked Paul's explanation of using the clay cap to help prevent water from even entering the system.