The polythene DPM for my wet room will sit beneath layers of insulation and a concrete slab. If the floor gets regularly wet, where will the water go? Presumably it wouldn't be ideal for the concrete and insulation to be waterlogged all the time. Therefore should I leave a few deliberate drain holes in the DPM?
No,the floor should be sealed and a drain if a wet room
Are you talking about the sealing the top most layer of floor covering (that people walk on, like tiles)? If so I agree and that part will most probably be done by a specialist. But is this the only line of defence? Because in that case if there are even small defects in top sealing layer, then any water which gets into the floor would truly have nowhere to go (can't drain/percolate downwards and cant evaporate from the surface).
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