Concrete blockwork – efflorescence
Listed under: Exterior, concrete and cement, concrete blocks, cladding, walls, moisture, wall cladding, solid concrete blockwork
Cause
Moisture in the blocks causing salts to migrate to the surface leaving a whitish-grey residue
Repair
- usually weathers off with rain washing
- remove by brushing off deposits with a stiff bristle brush; rinse off with water
- determine source of moisture in the bricks; address the cause