Trying to find the best spec for this work considering the gable is exposed to rain and wind. I'll need it to pass planning and listed building consent in due course. Removing the render so will probably need to cover the wall with rough lime render to smooth it off to attach the insulation. What type of rough lime render is recommended here please? Looking to insert 30mm to 40mm hemp insulating board or similiar (CO is probably going to insist on natural material)?? Any recommendations on the material please? Assuming two layers of lime render to finish for breathability and to appease the CO? What type of lime render is advised for the finish? Has anyone done any similiar ? Thickness of insulating material is max 40mm to keep external appearance. Thank you !