Drummy plaster in foundation walls

Cause

Loss of bond between the cement plaster and the concrete

Repair

  • small areas may be left as they are
  • for large areas (that may be visible as plaster bowing out), remove loose plaster; scratch to roughen the substrate to provide a good key (repair any damaged concrete); re-plaster with a cement plaster

Cause

Corrosion of reinforcing in the concrete

Repair

  • small areas may be left as they are
  • for large areas (that may be visible as plaster bowing out), remove loose plaster; scratch to roughen the substrate to provide a good key (repair any damaged concrete); re-plaster with a cement plaster