In brief

Repairs to six blocks of flats were carried out by Ronacrete Approved Contractor Gunite (Eastern) Ltd for Lengard on behalf of Southwark Council.  They used products from the Ronacrete RonaBond Concrete Repair & Coatings range as part of a larger refurbishment project costing around £4m.

The project

Main contractor Lengard was awarded an internal and external refurbishment project by the London Borough of Southwark.  The refurbishment was carried out on six blocks of five, six and seven storey residential flats at St Saviours Estate, London SE1. The project required repairs to the fabric of the buildings.

Ronacrete Approved Contractor Gunite (Eastern) Ltd was sub-contracted by Lengard to carry out concrete repair and protective coatings, mastic joint sealing and brickwork repair.

Product and application

Gunite cut out and prepared areas of damaged concrete, primed the exposed reinforcement with Ronacrete Standard Primer and then re-primed the reinforcement when the concrete was primed, before applying RonaBond HB40 high build polymer modified mortar.

RonaBond HB40 is a pre-packed high build polymer modified concrete repair mortar. It is often used to repair concrete on vertical surfaces and soffits where ease of application is as important as strength. It is typically applied in layers up to 50mm thick on walls on walls and 30mm thick on soffits.

RonaBond HB40 is particularly suited to the repair of overhead concrete, such as the underside of concrete staircases, which can become damaged over time, especially when exposed to the elements as the staircases are on the St Saviour’s estate.

The repaired areas were then made ready for decorative and protective coatings by the application of RonaBond Easy Skim FC. This is a pre-packed polymer modified mortar which is applied as a skim coat in thicknesses up to 3mm, to provide a smooth, hard finish to damaged, blemished and repaired concrete. It is a levelling mortar that provides a smooth “harder than plaster” finish to walls.

The final stage involved the application of decorative and protective coatings to the repaired surfaces. Two products were used at this stage, RonaBond Crack Bridging Anti-Carbonation Coating WB and RonaBond Anti-Carbonation Coating WB.

To read more about RonaBond, please click on the Trade Link.