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There's been some miscommunication re. my piled foundation design with the result that I now have 2 options: 1. The piles are tied to the ring beam with the result that there is what MBC describe as a 'minor thermal bridge' for each pile. The upside of this design is that I don't need to spend approx £5k on cellcore for anti-heave and perinsul blocks for the load points of the superstructure to sit on. 2. The thermal bridge is broken by not tying the piles into the ringbeam; I will need to have cellcore and perinsul blocks. I don't know the cost of the latter but it's unlikely to be cheap. MBC haven't specified what they mean by a 'minor thermal bridge' so it's hard to make an assessment. Obviously, saving £££ on the anti-heave and additional insulation is attractive, but I don't know if it's a good long term decision. Any thoughts from the hive mind?
