Heritage roof refurbishment at Tower Bridge
Garland UK Technical Manager
Jack Costello
Approved Contractor
JAW Roofing
Garland System
Dura-Coat
Single-Point Guarantee
20 Years
As one of the UK’s most iconic and historically significant structures, Tower Bridge is a Grade I listed site that demands the highest standards in conservation, safety, and technical delivery. As part of a planned heritage maintenance programme, the client identified that three independent external ticket office roofs, located at the north and south approaches, had reached the end of their serviceable life. The original asphalt waterproofing, installed in the 1960s, had deteriorated and required replacement to ensure continued weatherproofing.
The project demanded a carefully considered solution that would respect the building’s protected status, retain the visual character of the existing roofs, and be installed without disrupting the bridge’s operational function. Working in a live public environment with significant pedestrian footfall added further complexity, as did the requirement to avoid hot works and maintain the original light grey reflective finish.
Garland UK was appointed as system designer and material supplier, with Technical Manager Jack Costello overseeing the specification, detailing and technical support throughout the works. Installation was delivered by Garland UK Approved Contractor JAW Roofing, working under Garland’s quality-assured partnership model.
Solution
Garland UK specified the Dura-Coat liquid waterproofing system, a high-performance polyurethane-modified methyl methacrylate (PMMA) solution engineered to provide durable waterproofing over existing substrates, including aged asphalt. This made it an ideal match for the ticket office roofs, where retention of the existing structure was a conservation requirement.
The system offered several critical advantages. Its flame-free, cold-applied application removed the need for hot works and eliminated associated risks within a live public setting. Dura-Coat’s rapid curing properties ensured reliable installation even in lower temperatures, with catalyst levels adjusted daily to suit site conditions. Crucially, the system build-up allowed for direct application to the cleaned asphalt substrate without any alteration to existing thresholds or parapet levels.
The full system included Garland Dura-Coat Primer, an embedment coat, reinforcement fleece, and a colour-matched light grey topcoat to replicate the original solar-reflective finish. All materials were fully compatible with the existing asphalt, and designed to deliver long-term waterproofing with minimal environmental impact. The system, supplied in full by Garland UK, ensured complete technical continuity and traceability.
Throughout the programme, Garland UK provided close technical oversight, reviewing detailed drawings and advising on sequencing, termination accuracy and quality assurance. Jack Costello conducted regular site visits, offering practical guidance to support the contractor during cold-weather work and overseeing key detailing to ensure full compliance with the agreed specification. The works were tracked using Garland UK’s Roof Asset Management Programme (RAMP), providing progress reports and photographic documentation as a digital audit trail for stakeholder transparency.
The insulation build-up was increased to 150mm PIR, improving the roof U-value from 0.24 W/m²K to 0.10 W/m²K. This step change in thermal performance directly reduced heat loss and supported the wider low-carbon heat strategy being introduced across the estate.
Garland UK Technical Manager Dan Crowley provided ongoing support from initial survey to on-site project delivery, working closely with other trades and stakeholders to resolve challenges as they arose and keep the programme moving.
Outcome
The project was delivered safely, efficiently and with no disruption to Tower Bridge’s daily operations. The refurbished roofs now provide high-performance waterproofing protection while fully preserving the heritage appearance and physical integrity of the original structures.
Thanks to the non-invasive specification, the works were completed without altering existing thresholds, avoiding the need for structural modification and maintaining compliance with strict conservation requirements. The finished result visually replicates the original light grey coating, ensuring continuity with the bridge’s architectural character.
The Dura-Coat system is backed by Garland UK’s 20 year Single-Point Guarantee, covering the design, materials and installation workmanship. This comprehensive guarantee ensures that, in the unlikely event of any issue, responsibility sits entirely with Garland UK, offering the client full assurance of long-term performance and accountability.
This heritage refurbishment exemplifies how modern liquid waterproofing systems, when correctly specified and supported, can be successfully integrated within the most sensitive environments, delivering conservation-compliant outcomes without compromise on quality, durability or appearance.
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