We dug out and poured a large slab for sitting dog sheds on, the slab was 27m long, we poured the slab in two sections to stop it from cracking. we finished up by digging a path along the front ad to the existing shed.
We built the shuttering in two sections, this allowed us to reuse the wood for the second section after the pour. we also laid waterproof sheets along the bottom to try and prevent rising damp. The slab also had a drain running through it, there were several ACO drains and a pipe that run the entire length of the slab.