Ideally, you need about 7 courses of (metric) brick masonry, on top of the conc', in order for the concrete foundations, not to be a problem with gullies and possibly other drainage items (heights) etc. Your DPM can form the first DPC and you can set the other DPC level with the outside. The other wrappy DPM stuff just looks faffy. You have a cavity keeping the damp out.
Thanks. Unusually it doesn't actually need any gullies, power cables or anything. It's being built onto an outbuilding that already has all of this, I deliberately over-did it with two gullies so it would be able to be extended easily. I'm getting the floor dug out to about 400-500mm and want to do that separately after lots of compacted rock. Plus I have leftover bricks that are effectively free. I'll just do 400mm+, to align with the adjacent building.Ideally, you need about 7 courses of (metric) brick masonry, on top of the conc', in order for the concrete foundations, not to be a problem with gullies and possibly other drainage items (heights) etc. Your DPM can form the first DPC and you can set the other DPC level with the outside. The other wrappy DPM stuff just looks faffy. You have a cavity keeping the damp out.
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