BMI Sealoflex is just the ticket at Heathrow

Close collaboration between the technical team at BMI and IMA member Itech Roofworks produced an effective answer to the challenge of refurbishing Pier 6 at Heathrow’s Terminal 3.

Originally built in 2006, Pier 6 is designed for the Airbus A380 superjumbo, so the scale of the project was massive – 6300m2 of roof. The main contractor, Mace, appointed Itech Roofworks to remove the existing single ply, replace damaged sections of plywood, build bunding and subsequently weatherproof with the Sealoflex Ultima liquid system.

A working airport such as Heathrow needs products that can be installed without affecting its operations, so Sealoflex solvent-free liquid-applied waterproofing and FireSmart Pyrobar Carrier Membrane were specified.

Sealoflex Ultima is virtually odourless when it is applied, while FireSmart Pyrobar is self-adhesive and can be installed very quickly once the existing single-ply membrane is stripped out.

The BMI technical team were tasked with supplying a roofing system with improved fire performance characteristics. BMI met this challenge and developed a bespoke solution for this specialist application; by incorporating BMI Icopal’s FireSmart technology to the specific bituminous and liquid elements of the system.  

“Both of these are bespoke solutions devised especially for this project,” explained Simon Ashworth, synthetics and liquids product manager.

Simon had surveyed the roof with construction director, Hayley Reynolds, and found that several sections exhibited signs of long-term water damage and required replacing. Together they devised a working plan that allowed the damaged sections of plywood to be replaced without interrupting the day-to-day activities of the busy terminal.

Use of the Pyrobar Carrier layer permitted a swift removal and replacement of the existing single ply, constantly maintaining the waterproofing integrity of Pier 6.  Even when weather stopped the roofing teams working on-site, Itech Roofworks would look to pre-laminate replacement sections of plywood to minimise any lost time and future interruptions.

The scale of the project meant setting up five teams, a total of 50 operatives, on both day and night shifts, every one of whom walked more than 10km each day. Their task was also complicated by the plant rooms on the roof, which meant they had to work around and under all the pipework and ducting, often on their hands and knees.

The night shift stripped out the existing mechanically-fixed single-ply and installed FireSmart Pyrobar Carrier Membrane to the existing plywood substrate to create a weatherproof roof. The day shift then applied Sealoflex Ultima solvent-free waterproofing membrane if weather permitted or prefabricated the replacement sections.

The restricted working spaces on the project posed significant challenges and  required a highly skilled and experienced team of installers, a member of which went on to win Craftsman of the Year at the IMA Awards 2019 in recognition of the skills he demonstrated on this project. 

To make sure that workmanship met the highest standards, each team had a quality manager who marked up drawings, wrote daily reports, and inspected all aspects of the installation.

Now one of the world’s busiest airport terminals, catering for the world’s largest passenger aircraft, is covered by BMI and will not need anything but routine maintenance for decades.

Ideal for situations where a site is operational during roofing works, Sealoflex Ultima solvent-free liquid-applied waterproofing is virtually odour-free, so there is no disruption to the use of the building  It is also very flexible, so that awkward penetrations to plant and equipment supports are easily waterproofed, and it benefits from wet-on-wet application, allowing faster application as the primary waterproofing elements can be applied in a single operation. The result is a robust and seamless surface finish.

Simple to install, Pyrobar Underlay will waterproof exposed areas very quickly, so it lends itself to re-roofing projects where the existing membrane build-up is stripped out. This polyester reinforced SBS-modified bituminous membrane features an upper surface that is finished with Red Syntan acrylic coating. This coating reduces the weight of the material, making it easier to handle on-site, whilst also providing the ideal surface to receive the Sealoflex Ultima liquid waterproofing system.

www.bmigroup.com/uk