Wall finishes

Defect

Cause/Action

Cracks related to building structure and movement

Cracks correspond with background structure and can be deep and wide. Professional advice is recommended for remedial action.

Shrinkage cracks

Cracks may be long and fine appearing generally after new work dries out. Commonly found at junctions of floors/walls and ceilings. They may correspond with joints in plasterboard or blockwork. Caused generally by shrinkage during drying out process.

Cracks due to differential movement

Cracks due to differential movement are usually apparent at intersection of internal/external walls and walls and ceilings. Cracks should not be filled with rigid materials. Flexible joint or sliding cover strip may be necessary.

Loose plaster

Loose areas sound hollow and are often cracked. They may bulge, sag or even break away. They occur generally due to poor adhesion, movement, vibration or ageing. General repairs after removal and cleaning may require a bonding agent.

Discolouration or blistered wall finishes

These are due normally to presence of moisture, chemical reaction or mould growth. Remedy dampness and redecorate after allowing to thoroughly dry out. May need special products for mould growth treatment

Wall tiles loose or fallen

Hollowness may occur after fixing due to lack of adhesive or incorrect adhesive in wet area. Background shrinkage or tile expansion are other causes. Refix tiles after cleaning using flexible or waterproof adhesive if relevant.