Mike Lyle wrote:
Roger wrote:
[...]

If the sheet is impermeable, it does not need to be 'kept away'

from

the surface it touches.


My worry there would be not the moisture from the soil side getting
in, but the inevitable moisture from other directions not being able
to evaporate freely from the shed side. But you've seen it working,
so it's OK.

Being corregated the amount that is touching is less than the battens.