Tall & Urban News

London’s Blackwall Reach Project May Not Use Timber as Originally Planned

London Photoshop
London Photoshop
15 February 2019 | London, United Kingdom

CF Møller is rethinking the use of engineered timber for its scheme to replace Robin Hood Gardens, following the UK government’s ban on combustible cladding materials for tall buildings.

The practice was appointed in 2017 for the redevelopment of the eastern side of the the east London housing estate designed by Alison and Peter Smithson in the 1960s.

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Early designs for the 330-home scheme, half of which will be affordable, have been designed in outline using cross-laminated timber (CLT) construction.

Now housing developer Swan has confirmed it is rethinking the use of CLT on the regeneration of the property, now called Blackwall Reach, as a direct result of the government’s ban on combustibles.

The new legislation, which came into effect last December, prohibits all materials with a European fire rating of less than A1 or A2 in the external wall construction on residential blocks, schools, care homes and hospitals above 18 meters in height.

Geoff Pearce, Swan’s executive director of regeneration, said that for the buildings above this threshold – a height of about six stories – it is now considering alternative materials, with a hybrid structure as one of the options.

He said: “We’re in the very early stages of considering [Blackwall Reach] as a CLT modular building and that will now need to be rethought.”

Asked about the wider implications of the ban, Pearce said: “We think it’s unfortunate, as we believe that CLT performs really well under fire load, and it got caught by a ban that wasn’t specifically targeting CLT as a material.”

CF Møller’s scheme is the latest phase in a wider phased regeneration by Metropolitan Workshop, which will replace the project’s former 250 homes with 1,575 new units.

A spokesperson for Swan, which is developing the site in partnership with the Greater London Authority and the London Borough of Tower Hamlets, said: “Phase 3 has been outline-designed in CLT. However, as a result of the combustible materials ban, Swan will be developing the designs with architects CF Møller, looking at different ways of constructing schemes above 18 meters. There are a number of options being explored that continue the use of CLT for the main internal structure, and these options will be completed over the normal course of the design process. The design stage of Phase 3 may take longer than expected but this will not affect the overall program and there will be no delays in terms of start on site or completion.”

Following the ban, the government faced criticism from CLT specialists, which had called for the method to be exempt from the regulation change.

Ministers first announced in June that they intended to stop combustibles being used following pressure from campaigners including Grenfell United, a group representing survivors and bereaved families of those who died in the Grenfell Tower fire in 2017.

At Blackwall Reach, Phase 1b and Phase 2, which includes 268 new homes in four new buildings designed by Haworth Tompkins and Metropolitan Workshop, are currently under construction and due to complete in 2019 and 2021, respectively.

Phase 3 is due to start on site in 2021 – 2022, once the residents living in the existing building have been rehoused into the completed Phase 2 homes.

For more on this story visit The Architects’ Journal (subscription required).