I provided a comparison for them as to what a genuine B3 rating involves.
There are so many variables considered in the BER calculation that comparing just a few aspects of two completely different houses doesn't really tell an accurate story. Especially when neither of you have The DEAP software manual assessors use to perform the calculation runs to 196 pages!
I do, I was a BER assessor for a few years.
The fact that there's no insulation in the roof means the BER is more than likely wrong or faked.
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