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Thanks for the link and the advice re BC. Yes its a timber frame but built on site. I paid builder to put up the frame and then intend to bring in the trades as i need them but insulate and plasterboard ourselves. Builder thought that 100mm insulation and then 35mm insulated plasterboard was...

plans say 12.5mm plasterboard ok for ceiling but k18 on the walls over the TW55 - ouch!

Hi I am project managing my new extension - frame is up and we are now ready to start insulating and plasterboarding. Plans specify 100mm thick Kingspan TW55 between the joists then 35mm K18 Kingspan insulated plasterboard. How-To books and telly projects only seem to use 12.5mm plasterboard...