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Sorry to ask but as matter oinsterest how did you work out 2.5 u-value, is there a special calculation you made based on the 2" softwood?

Thanks for the reply mointainwalker I suppose to duty is on me to prove the value as the roof is now gone. The council state, if it had past the pervious building regulation then it must have had a good enough insulation but this is all hear say, as the extension was built before I move in...

Hi I hope someone can help me. I had a aprox. 2" wooden flat roof on a single story extension behind the kitchen. It started leaking and and I was also loosing a lot of heat as it had no insulation. I changed it with Pelkington K glass pitched roof. I now want to re-move a supporting...