Hello, I've just built a Yardmaster 6' x 8' shed on a concrete slab. It is flimsy when you are building it, once the roof is on it stiffens up considerably. It is meant to be built with about 500 self tapping screws. The steel is galvanised and much thinner than a baked bean can. Because it was so thin, I didn't fancy self tappers and instead used nearly 600 pop rivets. I bought a cheapo pneumatic riveter. I added extra rivets where I thought necessary. Underneath the frame I used closed cell foam strip between the steel and the concrete.
It leaked. water came in around the edge of the floor.
I siliconed around the inside and used sticky flashband around the outside. That has stopped that leak.
I siliconed around all the joins inside. Next step will be expanding foam at the eaves.
It was £300. My neighbour bought a wooden shed 12' x 6'. It cost £1200. It is carp.
I'm using mine to store various old bits from my Citroen DS build. I can't throw them away yet but I can't move in the garage if they stay there, hence the cheapo shed.
