this post was submitted on 23 Jul 2026
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Do you need something between the home and the concrete to prevent water/dirt or anything else from potentially causing problems?
Concrete can dry out too fast before it sets or cures if you don’t. It prevents the subgrade from leeching the moisture out.
Could be other reasons at play here though.
So it's all sitting on a layer of small rock so water would drain well. And I'll be making a slope in the concrete so the water should get right at the end of the pad where I'll be making a franch drain / rock walkway to make sure nothing pools too much. Additionally my roof is overhanging quite a bit so the ~40cm are most of the time dry when it rains anyway unless rains gets sideways twice every 5 years or so.
That membrane is water permeable?