This is my current thinking on the greenhouse/ potting shed:
Getting this far with the base for the new greenhouse and potting shed involved quite a lot of work. There is a big build-up of hardcore, crushed into place under the steel tracks of the digger, and then blinded by sand. The formwork needed construction, locating, and leveling, before being buttressed to resist the outward pressure of 4 cubic metres of concrete. The DPM was then laid and staple to the formwork, then the steel reinforcement grid was cut, placed on concrete spacers, then twitched together (I have a potato sack puller for this):
Note the deeper section along the centreline. The building will have a masonry spine wall:
Then this arrived:
First job was filling the greenhouse/ potting shed base, which involved filling the 4 ton dumper and ferrying 3/4 of a ton of concrete at a time up to the two of us raking it roughly into place. Reinforcement stops concrete flowing easily, and the dumper could only get to one corner, so this was seriously hard work:
We used a vibrating screed leveler to pull it level: