built on a concrete base approx 8" deep.
i came up with this idea on my own and am willing to share it as i think it is almost genius:
water rots wood. any wood resting on or buried in the concrete will eventually rot meaning you may have to take the shed down, sort out the base and re-erect it. so....
on the concrete base mark out where the joists will sit, normally 400mm centres, running from front to back (the shortest distance). from front to back mark out approx at 500/600mm.
where these markings meet drill down (set depth on drill) to approx 5/6" using a 15mm bit.
using cement glue - get tihs in silicone gun type tubes, same stuff rock climbers use to fix ringy things into rock - set 15mm bolts taking care that they are as vertical as possible.
once set you can lay out the joists. use a nut with a decent size washer, drill out the joists to correspond with the bolts and lay over. get the first joist level and from there you can then set the height for all using a 4ft level.
i hope the diagram above makes sense.
make the frames for the walls on the ground and lift into place. brace off until all walls are up. from there it really is a piece of wee.
the shed above cost approx £1K inc. insulation in floor, walls and roof, carpet and the plasterboard inside. the two sides facing the garage and the fence are clad in plastic to save on maintenence. the four window frames on the right are self made. i stole the PVC window off a building site i was working on. the door i got for 80p from B&Q due to a cock-up by the girl at the till: reduced from £240 to £120 to £80 due to a blue mark. girl typed in 80 and didn't put the .00 after it. luckily i paid by card. the blue mark sanded out easily enough.
