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- 17 Mar 2022
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Hi -- small question about a DPM for an extension. I installed the DPM on hardcore and sand blinding, then 150mm insulation boards over that, then a further DPM over that, then poured the slab this morning. It's awkwardly placed so there was a lot of raking the concrete along to get it from the spout to the far end. At one point the rake got caught under the pouring concrete and pushed down, and, though I'm not sure, I think I felt it puncture the DPM. Couldn't do anything about it at that point as there was the whole of the rest of the pour to see to. It would be a small hole, if there is one. Is this going to be a problem?