Step by step to repair a concrete balcony

1. Remove sanding, peeling off and in compact parts of the balcony board surface by a chisel, hammer or a cutting hammer up to faultless concrete.

2. Carefully clean the reinforcement from rust by sanding or by a wire brush or a rotating wire brush to a metallic look.

3. Clean the surface with a high-pressure water jet to remove dust and other dirt from the surface to ensure high adhesion to other materials.

4. Immediately after cleaning the surface of reinforcement and steel components, apply 2 layers of corrosion protection coat . Apply the second layer after the curing time of 6 hours after the first coat.

5. A day before application of the adhesion bridge, wet the surface sufficiently with water once again to ensure a perfect connection with the subsequently applied material. Take care to prevent the formation of a water film on the horizontal area.

6. Apply the adhesion bridge on the pre-wetted surface with a hard brush to achieve continuous coverage of the surface, and ensure a perfect connection with the subsequently applied material. All openings and hollows have to be carefully covered.

7. Apply the renovation plaster Baumit BetoFill by the “fresh to fresh” system on the applied layer by pressure. The renovation plaster can be applied up to the layer thickness of 40 mm in one operation. Attention! The plaster cannot be applied on a dried adhesion bridge. If this is the case, the adhesion bridge has to be removed and the procedure repeated.

8. Install a suitable profile with a beak to the lower edge of the balcony. Then, apply the concrete screed evenly on the pre-wetted surface by the “fresh to fresh” system with a thickness of max. 5 mm to unify the surface.

9. Protect the reconstructed balcony board surfaces against too quick drying (e.g. by a PE foil). After curing the layer, make the final surface treatment.