One Chamberlain Square
is the lead project in a wider vision to create Paradise in Birmingham—the most important development the city has seen in a generation.
With the help of Alumasc
offering solutions for the entire building envelope, One Chamberlain Square is
set to be a vibrant mixed use development that will not only be the new home of
professional services firm PwC, but will endeavour to maintain a balance
between busy urban hub and the natural world.
To do this, Alumasc
provided a range of products and services encompassing the entire building
envelope, specified by Weedon Architects. This included a Blackdown Greenroofs Extensive
Brown Roof, applied over Hydrotech Hot Melt Waterproofing, alongside Harmer
Roof Outlets and bespoke solutions from Roof-Pro, for building D: an eight-story
commercial building over a podium car park. Inside, bespoke blinds by Levolux,
also an Alumasc company, were installed.
“This is an extremely high-profile development, which demanded trusted, standard setting products,” said Owen Doherty, Director at Weedon Architects and Project Architect for the venture. “All systems decided on were chosen on quality, durability and enhanced design life compared to competition.”
On the roof of Paradise
Blackdown Greenroofs Extensive Brown Roof is a green roof in the making.
Covering approximately 4000m2 of roof space for this project, One
Chamberlain’s ‘brown’ roof is installed without plant life and will naturally
seed from plant material that either blows in from the local environment or
that is introduced by birds. In this way, it literally replaces the green space
that has been taken up by the construction of the building it lies on, encouraging
biodiversity by providing and strengthening habitats for wildlife local to the
area, with truly local plant life.
Typically, the substrate is mounded to offer habitat variation, therefore
the depth of the brown roof can vary be between 92-170mm and have a saturated
weight of approximately 113-213kg per square metre, depending on the depths of
Beneath this, Hydrotech MM6125 roofing, a hot melt rubber bitumen
membrane, delivers sound structural waterproofing. The bitumen is heated and
combined with a polyester reinforcement and protection sheet to form a
weatherproof layer that has a 100% bond to prepared concrete surfaces. With no
product failures in over 50 years, Hydrotech Hot Melt roofing is guaranteed for
waterproofing integrity for the lifetime of the structure.
Working in tandem with each other, the Blackdown Greenroofs Extensive
Brown Roof helps to extend and reinforce the life and guarantee of the
waterproofing, offering a protective layer of natural insulation.
Giving his seal of approval, Owen said: “I only specify Alumasc hot melt
at the moment and have done for many years. All products and systems chosen
here have had zero product failures and I have never had any issues with
technical specifications on previous high-profile buildings.”
Only just slightly closer to the ground, controlled descent
three-stop blinds by Levolux were installed, anticipating the sunlight that
will beam into the glass fronted building upon completion and giving thought to end user comfort.
A roller blind system unique to Levolux, each blind is
designed to automatically descend to one of three stops in a controlled manor
when the operation chain is released, for a uniform look. Bespoke ‘Z’ brackets
were fabricated to support the recessed headbox surrounding the blinds.
Levolux offer an extensive range of blinds ideally suited for offices, public buildings, hospitals, schools and other locations where glare control is important. Established 1984, Levolux became part of Alumasc in 2007.
Providing efficient drainage
Given the huge expanse of roof space involved this project, effective flat roof drainage was essential. Harmer AV high capacity aluminium roof outlets were installed for this purpose. Suitable for all regular flat roofing applications with continuous membranes, these outlets are lightweight, durable, non-corrodible and have been proven to drain 40% more roof area than conventional gravity outlets, therefore further ensuring the long life and service of other flat roof systems.
Aiding project completion, Roof-Pro support systems were also tailored bespoke to meet
the roof structure requirements. Free-standing support and access solutions
were devised that would allow work to be carried out safely, efficiently and
without causing damage to any of the roofing systems being installed.
Owen explained: “The challenges that we had to overcome to ensure the project
was a success were the number of upstands, parapets, pitch pockets and davits
to content with, but we are extremely satisfied with how the project has turned
out so far.
“Technical support from Alumasc is very good; all support is geared towards aiding technical understanding, and solutions were developed for every challenge.”
A word from the contractor
Christian Bradley of Briggs Amasco, who installed the roofing, commented: “One Chamberlain Square and the
surrounding podium waterproofing form part of the largest construction
programme in Birmingham. We are extremely proud to be working on this landmark
“The products and systems installed all have long legacies
of successful projects behind them, and there are no better guarantees than
real results. They also offer excellent value for a competitive cost. These are
just a few of the reasons why we love working on Alumasc projects. Alumasc
offer a single source for all solutions, bespoke design detailing and the
technical support is always on-hand when you need it.”
Due for completion in autumn 2019, One Chamberlain Square forms an
integral part of a masterplan redevelopment that will transform part of
Birmingham City Centre.
Find information on all Alumasc products and services here: www.alumascwms.co.uk/ | www.alumascroofing.co.uk/
Explore more from Levolux here: www.levolux.com/
Keep up with Weedon Architects here: weedonarchitects.co.uk/
Find more information about Briggs Amasco here: briggsamasco.co.uk/