I am fitting firedoors in a 3 storey conversion, not a HMO, but an ordinary domestic dwelling. I have a problem. I am installing the door linings, and allowing for a 3mm gap at the top, 8mm gap at the bottom, and a1981mm tall door. Now the questionable bit. I have been to my carpet provider, and have measured the thickness of carpet plus underlay to be 20mm. This carpet, with time will eventually flatten down, leaving the gap at the bottom potentially bigger than the 10mm maximum that Jeldwen require. What do i do to allow for this? i have thought of installing hardwood door strips, which obviously give a permanant fitting? Please can anyone out there help me?
