We have just started wih a new builder who insists on using steel catnic lintols above all doors + windows the job is to be done in monorex with lintol features now the underneath of the lintol is where the problem lies , he has told me not to bother doing anything with the underneith part but I think that would look terrible , I'm thinking along the lines of bolting a peace of cement board followed by maite and mesh , any other input would be great , excuse spelling buttons on this phone are tiny