MASTER’S FIELD PROJECT
APRIL 2019
When reflecting on the work of our practice, the chamfered corner, is a recurring interest. This detail has developed over the years from our preoccupations with the Miesian re-entrant corner, the simplicity of a trabeated structure, and a desire to find ways of expressing a deep façade.
Simple chamfers in concrete and stone were employed in recent completed projects for Hampshire House and The Sultan Nazrin Shah Centre, Oxford. At the Master’s Field site in Oxford, currently under construction for Balliol College, a corbelled chamfered detail is incorporated in a load bearing façade. This project comprises eight student accommodation buildings and a pavilion arranged around a series of courtyards overlooking a cricket pitch.
A brick-clad chamfer at the corner between two windows is used throughout the accommodation buildings. This establishes a shifting perspectival relationship as one moves through the site, and gives all the buildings a common language. Corbelled brick and concrete lintels and mullions set up a trabeated structural rhythm which clearly defines each individual student bedroom and creates a delicate play of light and shadow across the façade. A series of finely detailed brick and concrete panels are layered within the depth of the window reveal, articulating a secondary rhythm which expresses the transition from solid to glazed elements.
The detail enables the depth and structure of the wall to be elegantly expressed, maximizing its presence when viewed externally and minimizing its presence internally. It also forms a generous threshold which provides privacy for students inside engrossed in their study. For moments of welcome distraction, the large picture windows frame uninterrupted views over the cricket pitch and across the campus.
The expression of a chamfered corner produces challenges in construction, particularly when expressed in precast concrete components clad in corbelled brickwork. When forming acute angles with orthogonal bricks, special consideration must be given to alignments and bonding. Interface details demand careful thought regarding sequencing and tolerances to achieve a symbiosis of structural performance with aesthetic ambition.
Externally, in the plan detail shown here, the apex of the chamfer is formed from stacked brick headers. This exposes three faces of each brick, limiting the choice of bricks, which are typically produced with only one finished stretcher face. Brick specials are required to form the chamfered corbel of the lintels, and grids are carefully set out to ensure alignment of vertical and horizontal corbelling. We looked to the meticulously detailed and crafted brickwork of Jensen-Klint’s masterpiece, Grundvig’s Church in Copenhagen, for expression of stepped vertical forms.
Internally, minimising the corner where the windows meet produces intricate challenges in the alignment of linings, blinds, reveals and fitted furniture. This complex resolution of constituent parts all work hard to achieve the aesthetic objective of the simple glazed chamfered corner.
Detail Key
1.Whitewashed ply bench 2. Aluminium window 3.Whitewashed plywood reveal 4.Plasterboard 5.Rigid insulation 6.Steel window fixing brackets 7.Metal pressing 8.Wind post 9.EPDM/ vapour barrier 10.Mineral wool insulation 11.Breather membrane 12.Steel restraint brackets 13.Corbelled brick faced precast concrete mullion 14.Flashing 15.Concrete cill 16.Concealed curtain track 17.Oak joist over 18.Concealed roller blind 19.Timber panels 20.Timber framed window 21.Prelaminated timber frame 22.Precast concrete mullion 23.Precast concrete coping over
THE FURTHEST FROM THE FLOOR
NOVEMBER 2014
Imagine a room without a roof, where the sky can be seen and the seasons read. This room holds the capacity to frame dazzling colour and scaleless formation, silent motion and subtle evolution.
What if a roof challenged these things, and set out to generate a drama quite of its own?
Often we witness the world at eye-level alone. Much of our urban landscape positively encourages us to do so. Yet it is sad if, on the occasion we raise our eyes to the ceiling, we are not enamoured with what we find. It is often height that offers the best opportunity for expression. With height comes volume and the potential to present the greatest manifestation of depth and structure.
Our practice explores the roof and the complexity of a soffit as an ongoing theme. The notion of the exposed rafters in a barn has influenced the design of the soffit in our gallery at Auckland Castle. We are developing an array of rafters that create density yet delicacy in their mass when tightly multiplied. Though the roof is low, its lowest point occurs just higher than your fingertips, creating a definitive datum between the world of rafters and the world of exhibitions. This effect is further enhanced by the muted nature of the walls to increase the feeling of overhead awareness.
As contrast to this, your gaze is directed by the vertical piers that surround you as you move through Bishop Edward King Chapel in Oxford. Slowly they rise, higher and higher, until they meet the ceiling, at which point orientation is adjusted and the piers fuse with the weave of rafters. It is pleasurable to witness something simple become something complicated. Height offers the opportunity for elements in the space to take you on a journey. They “pick you up” at eye-level and carry you up to the roof, where often the brightest or darkest environments exist.
The requirement to defend from rain leaves the roof little choice but to protect, as efficiently and simply as possible, granting the interior more freedom for expression. And why not, when you consider where most building users will stand? However, as our towns and cities become denser, the roof, as seen from its surroundings, becomes an increasingly important issue to address.
The two examples I have given construct varying degrees of interest, leading me to suggest that it is possible for a roof to respond to that drama in the sky with a drama of its very own.
Katherine received a BSc Degree from the Bartlett in 2008. In 2007, she was awarded The Henry Herbert Bartlett Travel Scholarship and the UCL Expeditions & Travel Grant to conduct a construction project in Kampala. She joined Niall McLaughlin Architects in 2012 and has worked on London Academy of Music and Dramatic Art, St Cross College in Oxford, the T1 Argent Building in London and Jesus College in Cambridge.