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Thank you. Building regs want a 25mm air gap, so would your method provide that? They originally said build a frame 25mm off the wall and then put celotex between the battens. I’m confused…as the celotex is 55mm, wouldn’t it touch the wall (as the frame is only 25mm off the wall) and then no air...

Building regs have asked for 55mm celotex ga4000, 12.5mm knauf plasterboard, 25mmx47mm battens. Taped to create VPL. U Value 0.28

Hi, I hope I’m posting in the correct place. I am insulating existing exterior walls of my barn conversion. Building regs wants us to use 55mm celotex, 12.5mm plasterboard and 25mmx47mm battens. I am completely confused on how to do this, so many different opinions from different builders...