in old, constructed structures there are a variety of spaces where plaster debonding occurs. If the plaster and concrete cover over the roof has been de-bonded and there is exposed steel, it is recommended to make sure that remedial steps are taken to make sure further internal deterioration does not occur. If there is water ingress from the top of the surface that should be addressed by waterproofing the roof slab with Water Guard 3020N or Waterproofing Membrane and proper roof assessment. Please refer to the system for the rectification of leaked roof.
Furthermore, for internal surface it is recommended to remove the rust from the reinforcement as much as possible, it is also recommended to apply a metal mesh over the affected surface prior to the application of Patch 365 Plus or a mortar made from Ressi SBR 5850 and Silmix.
If there are minor hairline cracks over the walls, they too can be rectified using Crack Heal 920 2K. If the cracks are 6mm or wider, they too can be Crack Heal 920 2K. Please refer to the product technical datasheets for further information on the products and their usage