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56 EXTERNAL ENVELOPE


Wytham Chalet External Steel Staircase by Spiral UK


ot all fire escapes are created equal – some are designed beautifully so that their form does not strictly follow function but enhances it. The stair at Wytham Chalet is one such structure, its linear caging providing much needed security yet creating an aesthetic that mirrors the surrounding tree trunks. Dappled shadows from leafy canopies play tricks on the eye, bringing what could have been a perfunctory build element to life. Spiral UK were invited by specialist contractors Richard Ward Ltd to work with Oxford Architects on this rather special project. Oxford Architects were managing the refurbishment and modernisation of the chalet belonging to Oxford University in its use as a specialist teaching space. Now a Listed Building just outside Oxford city centre, the chalet started life as a Swiss Hunting Lodge that was dismantled brick by brick in the 1930s and transported to its current site before being gifted to the university in 1942. Oxford Architects and Richard Ward were


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careful in their restoration of this historic building, bringing it up to fire safety and building regulation standards – once the resident bats were deemed safe, that is. Part of these works involved a fire escape that needed to pass strict guidelines by both Listed Consent and Building Regs. Spiral UK engineered the design to create a secure escape stair that sat apart from the precious building, only touching at two exit points, and incorporated the security of full height steel bar balustrading and an outward- opening gate at the bottom. This prevented intruders while still allowing quick and safe exit from the building. The stair itself is a hot- dip galvanised (EN ISO 1461), mild steel spiral and the enclosure was powder coated in RAL 7021, finishes that will last for many years to come. The result is a subtle yet striking design


that sits beautifully in the landscape, blending successfully with both the darkness of the chalet and the shapes and shadows of the surrounding woodland. For more information or to book an online CPD email info@spiral.uk.com


0330 123 2447 spiral.uk.com


AT A GLANCE


Floor to floor height: 2880 mm + 2688 mm


Staircase Diameter: 2100 m Risers: Open Treads: 27 @ 1050 mm radius in durbar plate with nosing tape Clear tread width: 822 mm Landing: Two special landings of overall 2850 mm x 2150 mm durbar plate Balustrade: Formed from outer enclosure with 38 mm diameter inner and outer tubular handrail Other: Enclosure comprising 27 mm diameter CHS vertical uprights extending to 1.1 m above top landing, with access control system to bottom gate. All mild steel hot dip galvanised to EN ISO 1461. Enclosure, vertical columns and balustrade only having powder coated finish to RAL 7021 Guide price: £40,000


Photos © Oxford Architects


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ADF JUNE 2021


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