My new shed is leaking water. Any advice would be appreciated.

I bought a little Stratco tool shed. This is the type of thing that gets delivered partly assembled. Each of the 4 walls are provided as assembled panels. The door is pre fitted. A couple of corrugated sheets make up the roof. All you do is pop rivet it together.

I prepared a slap of concrete for it to sit on. The steel sheets of the sides are fitted into a u-channel (top and bottom) and riveted to it. I presume what happens when it rains is that water hits the walls, runs into the u-channel at the bottom, and because the u-channel is open at each end this allows the rain to flow onto the floor of the shed.

The u-channel is about 25mm high.

I was thinking of mixing up a very watery sand & cement mixture, with a consistency somewhere between milk & cream and pouring it into the shed until it just covers the u-channels on all four sides. My reasoning was that it would find its own level without any need of a spirit level and be smooth without the need for any trowelling. But I wonder that such a wet mixture would be very weak and maybe not dry properly.

Then I wondered if there were any more suitable preparations.


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