i have a job where the fireplace wall always has a small hair line crack down the brest which most fires will have ? the client wants us to make sure it never comes back i hacked it off fire cemented the crack steel meshed rendered up and skimmed still came back , the brick work wasnt the best so i think this is where the problem lies .im thinking along the lines of strapping it out and boarding but dont really want to use timber because of the heat what other options do i have . the fire is recessed in to the wall and has a glass /steel front