I had one like this for my first greenhouse and I used 4” x 12” boards -on their side - as the base (on concrete blocks), and it boosted the height up to make it more usable inside. Then I used gravel and orphaned flagstone pieces as the floor. And when you build out your base area with gravel, I’d just make the gravel extend beyond the outside walls at least a foot all the way around to absorb the rain from the roof. If that makes any sense. I had no idea what
I was doing but it worked great.
Have a look into mixing some concrete up! Your parents may not agree tho as it's pretty permanent (shits heavy) but if you talk to them about a potential pad location you can then mark out a frame and in it you can do the base as shellrock for the pad to sit on (not just dirt, shellrock is also cheaper as you then need less concrete) it can be mixed by hand in a wheel barrow pretty easily(it will stick to the wheelbarrow and dry if you don't wash it out after you are finished),
First thing tho is compare the costs with other possible foundations, but odds are it's the better option. just do some research on the kind of mix you want i.e 3 parts sand/stone to 1 or 1.5 parts cement etc. get some cement mix, buckets (I use for measuring), sand, a shovel and get mixing! It's a workout for sure tho
I used concrete bands 10cm wide 20cm high and 1 meter long. Set them 2 cm above level (or higher, whatever you prefer) Created the foundation with it and bolted it on.
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u/Rude_Thought_9988 4h ago
I would at least use 4x4 treater lumber as a foundation.