There's damp along both edges of my concrete shed floor. no moisture, not actually wet to the touch, just damp. we used dpm, both under the entire floor, which we poured concrete over and also under the footings.. Hi i recently put up a metal shed. it was put on a concrete base. i had the concrete floor put down last week. since then i have noticed the floor is very damp. i am not sure if the membrane was put down, i imagine it was.. How to protect stuff from damp in my shed. by matt (southern england, uk) john, i have a shed provided by our housing association. it's basically a long block, brick built building, that has been split into 6 sheds that have a concrete base. each brick shed has a wooden door..
Dear all, i have purchased an ex-display shed. it was re-assembled in my garden and, following advice on this forum, i wanted a damp proof membrane placed over the tops of the tanalised wooden bearers and the underneath of the shed floor to protect the flooring from rot.. A basic run down of the process is to dig the hole 300mm wider and longer than your shed floor, 100mm deep (providing the ground underneath is solid) and pour the concrete onto a damp proof membrane you have laid inside the base of the hole.. Damp concrete floors are often common in garages. chances are that when the concrete was poured, no plastic was laid beneath it to form a vapor barrier. basements with this problem may have to use a dehumidifier to remove excess moisture from the area..
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