CLADDING & SHEETING
RCIMAG.COM MAY 2018 049
4 Longwalk reflects
well on Proteus
High-gloss Proteus HR soffit panels and rainscreen
cladding have been used on a futuristic Grade A office
redevelopment next to Heathrow airport, London.
4 Longwalk in Stockley Park has remained
faithful to the original Arup-designed building, with a
new entrance, atrium and roof soffit featuring Proteus
HR high-gloss panels in RAL 7004 signal grey.
Identical Proteus HR high-gloss panels
were used at the rear of the building to create a
vertical band of rainscreen cladding that runs up
the building over a stair core and ground level
entrance and walkway.
The Proteus HR soffit panels, specified
by Barr Gazetas architects, reportedly form a
striking, reflective underside of the large 19m
cantilevered roof that shelters the front forecourt
and vehicle drop off point.
Proteus design staff reportedly engineered the
soffit system to achieve the optimum outcome for
the client, architects and installer. This involved
increasing the thickness of the aluminium skin on
the soffit panels, enabling its span to be maximised
in line with the architect’s brief.
Increasing the panel skin thickness also had
the effect of minimising the structural requirement
on the soffit system, meaning Proteus was able to
optimise material usage to meet the overall budget
set for this element of the building.
Each soffit panel is supported by the Proteus
aluminium carrier system and ancillary components.
All Proteus HR cladding and soffit panels are
designed with tight radii at the edges for superior
sightlines. It is anchored to the cantilevered roof
structure with invisible fixings, accentuating the
sheer, smooth high-gloss aesthetic.
A link with the original Arup building design
is said to be maintained through a large circular
penetration that is punched through the projecting
roof, which also creates additional light and space.
Proteus assisted during design, detailing and
installation of this circular aperture to ensure it
integrated perfectly with the soffit.
The design team at Proteus Facades worked with
Deepdale Solutions, the cladding and soffit installer,
to create an engineered solution on this project, with
‘visual purity’ of the soffit and rainscreen cladding
being the overall architectural requirement.
“We felt that the tone set by the high-gloss
finish on the Proteus HR soffit panels achieved the
aesthetics we were seeking on this project,” said a
spokesperson from Barr Gazetas. “The Proteus HR
system with a RAL 7004 signal grey gloss finish
accentuates the full quadruple height reception area,
increasing the impact and presence of the entrance
in keeping with the scale of the building.”
Proteus HR is an integrated modular rainscreen
system with an aluminium honeycomb core,
structurally bonded between two thin gauges of
lightweight metal skin to create an optically flat
panel. It is available in steel, aluminium, zinc,
stainless steel, copper alloys and other materials.
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