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Plenty of garden space thankfully, it's a 1/3rd of an acre site.

Thanks, all food for thought, so am I right in saying if I use A142 then I won't need to cut the slab (7x5) to induce cracking? Thickened edges, a 200mm edge sloping up at 45° to meet the 100mm main slab ok or more?

Yes Dave, I think I need to get on the phone to a few concrete suppliers near me, I've got near free access to two wackers thankfully so they'll get a good workout! I need to have a think about formwork too

Right then, I've seen sense and looked at a better location, better in several senses I think. This is only near to a hedge and a small Hazel which is a good 5m away but also has better more level ground. I'm trying to keep costs down where I cam so would a 150-200mm thick slab with fibre...

One detail I can't decide on is how I get the DPM to finish, I intend doing it the same as you but how did you get continuity up to the DPC between brick and frame? Great build by the way!

Thanks mate, that sounds ideal especially the fibre reinforcement.

I like that idea as I can still stay 50mm out of the ground at the higher end of the site so not causing accessibility issues or reduced internal height. Presumably as long as tree roots don't cause an issue when digging down for the base all should be fine.

I was more worried about the tree cracking my pad

Surely by the time I've got ground screws or piers and floor joists I'm going to be quite far out of the ground and losing valuable height at the eaves

Don't get me wrong, I appreciate your advice and will have a think on it but I'd rather a solid concrete base to work from as it gets really wet where I am so the idea a wooden floor failing once I've got an expensive structure on top doesn't appeal. Also oil and fuel getting onto a chipboard...

I need a concrete pad due to a 250kg planer thicknesser and motorbikes that will be occasionally stored/maintained in it. I'd also like to have 3 courses of brick or a block wall to get above splashback

I want to maximise the permitted size allowed without planning and without it being a long narrow space so I initially thought along the lines of 7x5 given that the internal space would then be nearer to 30m². I've no close neighbours and rural so I'm not too fussed on being strict to actual...

Any thoughts on this? I'm keep to proceed with my plans but the realisation that a large beech tree is going to cause me issues has stopped me in my tracks. Repositioning is an option but doesn't work so well with garden layout or the contour of the land as its not an overly flat site.

300mm, wow I wasn't banking on that. Ive looked at resiting it but this area makes most sense other than the tree situation

One other consideration is a large beech tree that sits central on our land and is near to where I'd like to site my workshop, how close can I sensibly go to it or what measures can I take to safeguard my concrete pad? Felling it is not an option at this point

I'm a longtime lurker on here but this is my first post. I'm planning a workshop of roughly 7 x 4.5m, I'm thinking of a raft type foundation, 3 courses of brick then studwork framing clad internally with osb, insulation and then wrapped externally in membrane then either corrugated sheet or...