Repairing shrinkage cracks on AAC block walls involves the following steps:-
1. Clean the crack:-
Remove dirt, debris, and any loose material from the crack using a wire brush or vacuum cleaner.
2. Prepare the surface:-
Use a hammer and chisel to widen the crack slightly, creating a V-shaped groove. This helps create a better bonding surface.
3. Apply a bonding agent:-
Use a suitable bonding agent (e.g., polymer-modified cementitious adhesive) to the prepared surface, following the manufacturer’s instructions.
4. Fill the crack:-
Fill the crack with a repair mortar (e.g., polymer-modified cementitious mortar) matching the color of the surrounding wall, using a pointing trowel or putty knife.
5. Finish and smooth:-
Use a damp cloth or sponge to smooth and finish the repaired area, feathering it out to blend with the surrounding surface.
6. Seal the crack (optional):-
Apply a suitable sealant (e.g., silicone or acrylic-based) to the repaired area to enhance water resistance and durability.
7. Paint or finish:-
Once the repair is fully dry, paint or finish the wall as desired to match the original appearance.
