Greenhouse concrete foundation advise required

10 Apr 2012
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United Kingdom
I am erecting a 6x10 greenhouse and want a solid foundation so it lasts. I have dug a trench approx 2m x 3m ( measured so big enough) and 25cm wide x 30 cm deep.
I have no experience with foundations or concrete so would value any advice, being a novice I want the simplest options (least chance of messing it up). My specific questions are:

1. Is my trench deep and wide enough?
2. Should I go concrete all the way or something else like a concrete footing foundation + concrete blocks, or hardcore followed by concrete. (pros and cons of each method appreciated - though I'm looking for the easiest option - one man and a spade!)
3. What mix of concrete would be recommended and how do I work out how many bags of what are needed.
4. I've calculated I'll need about 0.75m cubed of concrete (if I do the whole foundation as concrete) do I need to hire a mixer for this volume?
4. Can I pour the concrete directly into the trench (which is more like clay towards the bottom). Or do I require a wooden frame or 'clayboard' inside the trench.

Many thanks for taking the time to read and answer.
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What about the "floor" inside the structure - why not pour a slab? No heavy foundation would then be required., and you could build off the edge of the slab.
How will the walls be constructed?

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