If done properly the oversite is stable, is topped with compacted
crushed stone or the like, and blinded with fines. So there's nothing
to move which could "wear out" the DPM.

From the little I see of ground work around here I can see why some
prefer block and beam

On 30/09/2019 09:00, Brian Gaff wrote:
Would not a dpm just under the slab tend to wear out rather fast letting all
those problems reoccur?
Brian



--
Robin
reply-to address is (intended to be) valid