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Hi Guys, I have built an extension on top of a single storey ground floor extension. The original extension only had a 50mm cavity so the new build has the same. My building inspector has told me that because the cavity is only 50mm then i must fit plasterboard with a 50mm insulation. My...

Hi, I am building an extension above an existing ground floor extension. After stripping back the felt roof to expose the joists they are resting and fixed on a timber wall plate. The wall plate is on the internal wall. I have been told by a builder that i know that it is ok to build...