Case Study- Lees Street

Project:               Lees Street Development

Address:             Lees Street Development, Ashton Old Road, Manchester, M11 1ND

Architects:         John McCall Architects

Contractor:       Watson Homes

Roof size:            215m2

Roof system:     Sika Sarnafil

Installation:     Sika Sarnafil S327-15EL lead grey membrane, Mechanically Fixed, Sarnavap 500E     VCL, Sikatherm PIR AL Insulation, Warm Roof system used


The Lees Street project was part of a stunning new development in the bustling heart of Openshaw, called The Whitworths.

The Whitworths development stands as a testament to modern urban planning, breathing life into the community with 34 new properties across two sites, Columbine Street and Lees Street, with a blend of 2 and 3-bedroom homes alongside properties available for shared ownership, it caters to diverse lifestyles.

Situated just a stone’s throw away from the nearest train station and a mere 2 miles east of Manchester City Centre, its prime location beckons urbanites seeking both connectivity and tranquillity. Surrounded by an array of amenities including esteemed educational institutions, world-class sports facilities, and lush green spaces, The Whitworths emerges as a beacon of modernity amidst historical charm.


Here at Enviroply Roofing, our role in the Lees Street project is pivotal, as we weave innovation and precision into every aspect of the roofing system, working along side Watson Homes and Sika.

First, we began the roofing build up with the installation of the vapour control layer, a foundational element essential for safeguarding against moisture-related pitfalls, using the renowned Sarnavap 500E by Sika, we ensure maximum moisture resistance, mitigating the risk of rot and decay. With its superior durability and flexibility, the Sarnavap 500E sets the stage for enduring roof security, laying the groundwork for a robust structure.

Following the vapour control layer, we meticulously integrate the Sikatherm PIR AL Insulation, a testament to our commitment to thermal efficiency. Designed to combat heat loss and optimise energy conservation, this insulation board, clad with composite foil, promises unparalleled performance, using a staggered bond pattern and telescopic tube fasteners, our team demonstrates their craftsmanship, fortifying the roof against the elements with unwavering resilience.

To complete the roofing system on the Lees Street project we used Sika Sarnafil S327-15EL lead grey Single Ply membrane, this premium membrane embodies sophistication and functionality in equal measure. Engineered to deliver unrivalled waterproofing and weatherproofing, it stands as the ultimate shield against nature’s wrath. With ultraviolet light stabilisers and flame-retardant properties, the Sarnafil S327-15EL ensures longevity and aesthetic appeal, elevating the visual allure of the property whilst fortifying its structural integrity.


As The Whitworths continues to evolve, ushering in a new era of urban sophistication, we at Enviroply Roofing remain steadfast in our dedication to excellence, as such achieving a 25 – year product guarantee for this project, with a steadfast commitment to innovation and sustainability, with each project we embark on, we strive to achieve the highest of standards, by doing this we not only enriching communities and fostering enduring relationships.  Together, we envision a future where architectural marvels stand as testaments to human ingenuity.