Hi
I have an existing conservatory(3mtrx3mtr) which I would like to change to a single storey extension.I have done a sample dig to measure the depth of the concrete slab which is 300mm thick,finishing at ground level.The surrounding ground is primarily clay.Is this slab deep enough or will I need to underpin.
Any input would be grateful
I have an existing conservatory(3mtrx3mtr) which I would like to change to a single storey extension.I have done a sample dig to measure the depth of the concrete slab which is 300mm thick,finishing at ground level.The surrounding ground is primarily clay.Is this slab deep enough or will I need to underpin.
Any input would be grateful