Cain

Thanks Gents, I will keep you posted on the solution. But this may be one for the 2 off internal posts - especially in conjunction with the padsone if by themselves it wont suffice.

Fantastic, will do, thanks

Greetings I am in the early stages of building a single storey oak framed outbuilding around 90m2. I intend to do everything myself to keep the cost down and as I have always wanted to build a cruck frame, indulge and try and enjoy the process. The ground has some clay content and is close to trees so I was thinking about going down the route of an insulated slab which doubles up as the envelope to form the raft. You may be familiar with passive house foundation stuff. The problem that I am finding is that despite being ‘just a large shed’, building control will need to be satisfied that structural calculations are done. To this end I have had some some quotes done and most are eye watering, or reasonable with the proviso I then spend a small fortune on a bespoke polystyrene system. Is anyone aware of any generic calcs for rafts (after all there are tables for timber beams!). Any help of any kind would be very welcome Cain assembly.pdf