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Can you please explain how you came to need the gas mat membrane...was this based on a ground drilling type survey, past building use or building regs....im about to embark on a barn.....and need to know now im past the bat surveys, and the blood pressure has settled
There was a condition put on PP to survey the surrounding site because of ground usage from 60+ years ago!!, the upshot was they wanted to know if there was presence of methane gas. As the survey and bore holes would have come in at about £8K and the mat and the membrane at half I just told Building control I would pretend there was and not bother to investigate the fact.
Bitter pill is that all the local building control personal have been ermm "moved position" and the Replacement head said he wouldn't have bothered.
Conditions and surveys along with planning are some of the most stressful and expensive parts of the build.