Did our base in less than a day, patio slabs on top of a sand/cement mix on top of weed membrane. Take the time to get the ground as level as possible and your job will be easier and you'll need less sand.
Looks ace, did you use bathroom sealant to stick the greenhouse down?
I did one plug and screw into a slab before deciding that was too much faff, used no more nails.
There's a bunch of smaller slabs holding the frame down on the inside too.
@rhb started
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Did our base in less than a day, patio slabs on top of a sand/cement mix on top of weed membrane. Take the time to get the ground as level as possible and your job will be easier and you'll need less sand.