Cannon Street 3M Case Study

Romulus required a specialist contractor to apply 3M’s premium Scotchkote external wall coating system to their iconic building in The Square Mile.  Only a stone’s throw from St Paul’s Cathedral, 30 Cannon Street was the first building in the UK to be built with GRC facade panels, achieving a grade II listing in 2015.

The client required a 10-year protection guarantee from the 3M paint system as well as to improve the external appearance of the building.  Careful phasing with other contractors was required to achieve the correct sequencing and weathering details as full glazing replacement took place.  Close liaison with the 3M technical department was essential at all stages.

How did we help?

Firstly, a trial area was conducted which required the full cycle of visits from degreasing and pressure washing through to two-pack primer and top coat application.  The trial was approved with flying colours by both 3M and the client, swiftly followed by an order for the full project.

Haywoods then developed a decoration strategy to suit the phasing of work with the glazing installer and other related works.  We recommended that climactic monitoring records were kept throughout and no application took place on days where weather conditions did not meet the system’s minimum criteria.  3M could then have complete confidence in providing their guarantee upon completion.

Regular team meetings were attended to adjust our working programme and meet the deadlines for scaffold strikes.  Due to the success of the team’s workmanship on site, we were also asked to undertake mastic replacement to joints which formed a key weatherproofing detail for the paint system.

The results

30 Cannon Street has been transformed and is now one of the city’s showcase buildings, complete with roof terrace and gardens.  The architecturally unique panels which made the building famous have been protected with complete confidence for many years to come.

Full climactic records were signed over on completion as part of the health and safety file.  In addition, wet film thickness gauges were used for each area and handed over with a log book to support the guarantee from 3M.  Our thanks to Promain Paints and 3M with whom we worked in partnership throughout. – Always nice when we get a mention for the work we do.


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