Hello all
I want to build a lean-to flat roof shed following the Mike G plan of a 3 course brick plinth), attaching it to the rear side of my house (along a brick wall with two external chimney breasts).
I've taken down a much smaller rickety old shed in the same place and can see a complete concrete slab that extends from the side and the back of the house. It looks like the one the ground floor of my house uses so I'm assuming it was laid when the house was built in the '30s.
A quick look at the edge of the slab showed that it is at least 1ft deep (couldn't yet get to the bottom), but that it is not level, being sloped so that rain-water can flow off (I presume). Along the length (about 6.5 metres) we are talking maybe an 80-90 mm difference, and along the width (2.6m) maybe 30mm.
What is the solution here? Could I just pack the brick plinth with more mortar while I build it and then do a suspended floor given that the existing slab is a bit too sloped?
Or should I try and level the slab with more concrete?
I've no bricklaying (or shed-building) experience but I don't mind trying to muddle through...
Thanks
Simon