New self-compacting concrete slab and DPM height

[BobS]

We are having our slab poured today, 100mm Topflow Horizontal self-compacting concrete.

 

The supplier has been out to prep the area. Because we dug out the previous slab the plan was to run a new DPM up the walls from beneath the slab and lap over the DPC. However, the concrete supplier has cut the DPM they laid off just above where the slab will be. They apparently intend to lay another DPM over the concrete - beneath the insulation, UFH and top screed.

 

When I questioned it they said this is just how they always do it. It seems a bit strange not to run the DPM up the wall in a continuious piece so I wondered if there are any pros or cons to doing it this way?

[Mr Punter]

As long as the new DPM laps the DPC it will be OK but needs to be protected against damage.

 

Is the Topflow Horizontal expensive?  I would be interested to hear how the pour goes / any photos.

[BobS]

Pour went well and done very quickly (once the mixers arrived).

 

It's the first time our builder has used it and he seemed really happy with how it went, certainly a lot less work than wheelbarrowing it in.

 

Not sure of the exact cost as the floor was included in our builder's quote but he said it worked out about the same as standard concrete due to the time saving.