Hello My builder is suggesting he apply a wired mesh to the walls prior to skimming them in order to prevent cracks. Currently the walls are covered in wallpaper, I have pulled some of it off and the walls seem to be in relatively good condition, no apparent cracks. Is mesh necessary in this case? The house was built in 1970, not sure if that is considered old therefore I am wondering if mesh would be advisable? He is charging me £500 just for the wired mesh. Please help.