Now thats gone and thrown a spanner in the works, i take it different circumstances require different materials?
I wonder what circumstances they observe to calculate what kind of lime to use? I suppose the sub layer might have a lot to do with it , or perhaps moisture content? Perhaps if the walls are more absorbent such as clay lump then 3.5 would be better to use rather than NHL 5?
I know it was only my patio not my house but www.mikewye.co.uk were really helpful at sorting through the options for mixes etc. including answering some dumbo questions I had. They were also substantially cheaper to deliver a largish quantity of lime on a pallet than all the local suppliers.
If you're planning on mixing and pouring yourself that is.
Other lime suppliers are of course available - it might be advantageous to call a couple and ask what quantities & mixes you need to see if a common theme emerges?
I' Did , now a'll i need t'o do is remember ho'w to us'e them.'
Amc your probably right , i always thought it was just a lime mortar kind of mix with some ballast or expanded clay thrown in. I didnt think there would be variables depending on wall type etc .
My experience with the general building trade is they aren't clued up with non concrete building materials so I would seek expert advice from suppliers and online.
I think you'll find there are a number of ways to skin that particular cat. At a guess you won't want the floor to be substantially stronger than the walls but you will want it to be free from cracks. Depending on the size it might need reinforcing?
I don't know enough to really advise but you will find a lot of practical expertise in limecrete at http://www.greenbuildingforum.co.uk/newforum/