My SE just gave me a generic cut & paste footings details, so I thought I'd try and design it to new regs. However what a nightmare to match it to existing levels. I was digging a test hole today in 30c and it just got me thinking about it and I needed a rest.
I could make the PIR 150mm but what do I do about the 75mm gap under the slip brick? I guess I don't even need the foundation block, could subsitute for 2 blocks or remove all together?