Clarendon Hall, York House


London Borough of Richmond




Twickenham, London


Renewal of Roof Coverings



York House is Grade II listed building and is scheduled as an ancient monument, dating back to the 17th Century. The London Borough of Richmond Upon Thames Council decided to use York House as its Municipal Offices when it was formed in 1965, and the building remains the Borough’s head office to this day. It is also used for various functions including weddings.


When the existing roofing materials had reached the end of their working life back in 2022, Inspire were contacted to provide a complete refurbishment solution, This included stripping the existing materials down to concrete and timber decks followed by the supply and installation of a new, high performance built-up roofing system.


The specified solution was a Bauderflex three-layer bituminous membrane system, incoporating upgraded PIR insulation to achieve a U-value of 0.18w/m2k. All products were manufactured by Bauder, resulting in complete system compatibility and single source responsibility.


Bauderflex membranes combine high tensile polyester reinforcement with polymer modified SBS bitumen to provide robust and extremely durable waterproofing performance. The elastomeric formulation can accommodate building movement and temperature extremes, whiilst the 4.2mm thick capsheet is highly resistant to both UV rays and physical damage.





This refurbishment project consisted of the following:


  • Stripping of existing materials down to deck
  • Installation of new Bauderflex self-adhesive roofing system, including Bauder KSD Mica vapour control layer, BauderTEC Sprint Duo underlay and BauderFLEX K4E brown mineral surfaced cap sheet
  • Design and installation of bespoke BauderPIR to cut to falls / tapered insulation
  • Installation of new rooflight domes and glazing
  • Refurbishment of other existing glazed rooflights with a fill redecoration process. This comprised preparation of existing bars and framework and full white paint finish including primer, undercoat and topcoat.


Associated remedial works included:


  • Stripping off existing old lagging to exposed pipes and reinsulate using Armaflex
  • Lagging of pipework including gluing all joints & seams
  • Installation of new cabletrays
  • Repointing of brickwork and repairs/replacement to various coping stones to parapets.
  • Isolation and adaptation of pipework as required in order to suit new level of roof covering – supply reinstated upon completion.




All works were carried out while the building remained in occupation, so particular care and attention had to be taken to carry out works safely without any risk to the general public. Special scaffold crash decks were also provided prior to stripping up the roofs. This provided additional protection from falls whilst also preserving the internal surfaces of the rooms below.


Considerate working was required at all times so that any inconvenience was minimised for both the residents and the adjoining properties. The building was also located within a designated conservation area and our operatives needed to be mindful of this whilst carrying out the works.


Flexibility and an ability to adapt also proved valuable on this project due to the fact that works had to be paused on a number of occasions whilst Local Authority functions and weddings took place in the building. Works were also halted mid-contract whilst appropriate steps were taken to investigate the presence of bats that had been discovered within the roof space.


Nevertheless a first class project was successfully delivered for the client on time and within budget. A comprehensive 20 year guarantee, including all products and workmanship, was issued following completion of the roofing works.

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