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Hi mikric, Thanks for your post, I have not yet installed floor or roof insulation, I was hoping this solution may be an option, as on posting this problem I did hope I could overspec roof insulation to compensate. Would very much appreciate any help with calculating such a trade off to...

Thanks woody, Could you explain the basic's of a SAP calc, who does them, cost, when to do them, etc, etc. I assume I complete ceiling detail/insulation and then do the test? Although, I fear is this would mean the rest of the house is then considered and I know this would be likely to fail...

'theolden' I just have one small query, after looking online at this product; you quoted an R value of 0.79 but all sites I visited quoted Rvalue of 0.88, is there two simlar products available? On the plus this product does appear to be cheaper than I have been quoted - so will put this to...

I suppose now this post is on this forum may help any other diy'ers of 2 important lessons; Don't act on a suppliers advice alone! and Don't use dense block for cavity walls! Even if your extension is open plan onto a house that looses heat like a sieve!!

Many thanks 'theoldun' for taking the time to calc this for me. This is the solution Building Control have said - I could kick myself for listening to the supplier as I had no intention of using dense block - if only I have seen sense that day!! I was hoping I could get round the problem I've...

Used Dritherm 37 Was straight back onto supplier and to be fair they have said they'll do the insulation at cost, but the point is it's still at big expense for no gain.

Please help, have I got a case... My scenario is I am having a 20m2 extension built and I used dense blocks rather than lightweight. It was a selection made following a conversation with the supplier that the existing house is dense block and is to be open plan through to the extension -...