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Kensington House, Suffolk Street, Birmingham

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Systems used:

Axter’s high performance BBA Certified Hyranger® system with localised tapered insulation to improve drainage falls.
Hyranger is a well-established and trusted flat roof waterproofing system, comprising polyester reinforced SBS polymer modified bitumen membranes, developed to guarantee strength, stability, performance and cost efficiency.

Axter’s Hytherm ADH tapered insulation was successfully employed locally to improve existing falls, in addition to a standard 140mm thick Hytherm ADH flat board elsewhere to meet the target U-Value of 0.18W/m2K.


Axter’s technical team were invited to complete a roof survey and condition report of the existing roof area which had been suffering with repeated leaks, failed repair attempts and significant standing water. Upon inspection it was clear the roof covering had been recently renewed, but the workmanship, attention to details and drainage falls were sub-standard and no doubt contributory to the ongoing leaks and consequential ceiling damage to the areas below.

Although the client preferred a robust torch-applied reinforced bitumen waterproofing system, our Safe2Torch assessment picked up some redundant roof plant, combustible cladding interfaces and complex penetrations which necessitated a localised flame free solution.

Our team also carried out a level-survey to ascertain the existing falls, and what, if anything, could be done to alleviate the standing water without excessive cost.


Our comprehensive roof survey report included a dimensioned roof plan, identification of Safe2Torch areas / details, bespoke waterproofing designs for complex penetrations, and a thorough assessment of the existing roof make-up (via core samples) and drainage.

Given the apparent age and good condition of half the roof area, it was left in-situ and overlaid with a single layer membrane in the Hyranger system. Minor improvements to the drainage layout, via the introduction of a tapered insulation scheme central to the roof where the outlets where positioned, helped to significantly improve falls. Elsewhere, the rest of the existing roof covering and thermal insulation were stripped back to expose the original asphalt.

The asphalt received a new air and vapour control layer before the same Hyranger reinforced bitumen waterproofing system, inclusive of a mix of both flat board and tapered Hytherm ADH insulation, was installed to improve the falls and correct the thermal performance balance.

A Safe2Torch abutment detail to existing cladding was identified early on in the Axter roof survey report as a fire safety hazard, so in accordance with our specification and recommendations, our accredited Axtershield installer expertly installed a Hyranger® Neo-Bitumen® Flame Free membrane solution around a 900mm wide margin.

The Axtershield installer worked efficiently and to a very high standard to complete the project on budget whilst delivering an aesthetically pleasing and robust waterproofing solution.

FYR Project Management
Suffolk Street, Birmingham