Benson House at 33 Wellington Street in Leeds was originally occupied by accounting firm Price Waterhouse Cooper for over 20 years. After their move in 2016, Benson House was acquired by law firm Walker Morris to see all 500 members of their staff under one roof, becoming the biggest single site law firm outside of London.
The building needed to undergo a comprehensive £10m refurbishment to provide a premium working environment for Walker Morris without causing disruption to the surrounding offices. The existing standing seam zinc roof sheets, perimeter gutters, inverted plant room areas and external vertical cladding and louvres were in poor condition – however, due to time constraints, full removal and replacement of the roof was not feasible.
Tor Coatings were asked to provide specifications for all of Benson House’s roof elements. The Elastaseal Z waterproofing system was chosen as it comfortably met the design brief and delivered a 25-year warranty, something the law firm was keen to secure.
Initially, there was concern regarding the adhesion of the new system to the weathered zinc roof surface. However, after carrying out adhesion checks with the Elastaseal Z metal primer, the results demonstrated that the required adhesion could be achieved without any mechanical preparation, saving a significant amount of time and removing any risk of disruptive mechanical noise during application.
In addition to this, all of the elements of the Elastaseal Z system, including the primers, localised reinforcement coatings and the waterproofing itself, are low odour and therefore could be used on the gutters and the inverted plant room areas with minimal disruption.