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STIRLING LLOYD Effective Waterproofing For Students’ Living Roof 

Without doubt living roofs are an asset for any urban building; reducing the carbon footprint, improving the building’s energy efficiency and enhancing aesthetics. At Three Colts Lane in East London the addition of an Intensive Green Roof with decking and seating provides a secluded area for its residents. The development, designed for university students, comprises 203 modern self contained studio apartments as well as a rooftop common room and the landscaped living roof. To protect the roof and prevent water penetrating into the structure Stirling Lloyd’s 100% effective structural waterproofing membrane, Integritank®, was used on the development.

Following a seminar presented by Stirling Lloyd’s Regional Sales Manager Steve Beckett, Architects Broadway Malyan, were impressed by the product’s simple detailing and durability. They also liked the combined waterproofing and Green Roof offering from Stirling Lloyd and their preferred partner, Sky-Garden Greenroofs., and consequently, along with the main contractor, Mansell Construction Services, specified the methylmethacrylate (MMA) based system.

A Logistical Challenge
The busy urban environment posed complex logistical issues, which were not only a consideration for Stirling Lloyd Construction, the Authorised Contractor awarded the work, during planning but also impacted upon the choice of products. To minimise disruption to the local community the road could only be closed for one day on which all materials had to be craned onto the roof. This meant that everything, including machinery, waterproofing material, decking, paving, seats, plants and turf, had to be stored on the roof throughout the works. Therefore it was essential that the waterproofing membrane could be applied in phased sections. As Integritank is MMA based the system achieves excellent intercoat adhesion providing a seamless and 100% effective membrane without any laps or vulnerable joints, irrespective of the time between overcoating enabling works to be carried out in phases. Its toughness and resilient properties enabled it to be trafficked once cured without the need for additional protection and without compromising the integrity of its protection. Consequently, at Three Colts Lane other materials could be moved from one area to another, being stored on top of the cured membrane facilitating rapid project progression.

A Seamless Application
Prior to application of the 1,700m2 of Integritank the concrete roof was primed with Stirling Lloyd’s PAR1 Primer, which penetrates the pores of the concrete stopping any outgassing and also enhances the bond between the substrate and the membrane. Once the primer had cured, in under an hour, Stirling Lloyd Construction spray applied the Integritank membrane. Applied in two-coats, Integritank’s seamless spray application meant that even the presence of 200 ballustrade posts and upstands that would have created complex detailing issues for a sheet system posed no challenge with the product’s thixotropic nature ensuring that all profiles and surface contours were completely encapsulated.

The application was backed up by Stirling Lloyd’s unique on-site Quality Assurance scheme. Tests undertaken by the Authorised Contractor to provide complete confidence in the system included tensile adhesion tests, between the substrate and the membrane, prior to application, wet film thickness checks throughout application and non-destructive integrity tests once applied.

Environmentally Friendly Construction
Once the waterproofing system had cured and had its 100% integrity confirmed Stirling Lloyd Construction laid a geotextile fleece to act as a permeable layer for water filtration, followed by a water retention mat on top of the membrane.

Integritank’s inherent physical properties means it provides a tough, mechanical barrier negating the need for a root barrier and once again helping to reduce the programme time.

Consequently the water retention mat was covered with both hard and soft landscaping, including 600m2 of paving, 250m2 of sedum plug plants and various flowers, providing a serene area with magnificent views across London. The landscaping materials were sourced as locally as possible, for example the Green Oak planters where constructed from trees from local woodlands, to help ensure that the CO2 produced and the environmental impact of the project was minimised.

Smooth Project Delivery
Commenting on the project Beckett said “Living roofs are being used extensively to enhance inner-city aesthetics and reduce our environmental impact; Integritank is ideal for use on living roof projects, easily accommodating the on-site difficulties and challenges posed by this modern method. Integritank’s seamless and 100% effective protection has not only ensured that Three Colts Lane will remain protected against water ingress and other corrosive processes for many years to come but also helped ensure a smooth project delivery, with the living roof being completed four weeks ahead of schedule.”

Email: roxanna.anderson@stirlinglloyd.com


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