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Arthur Road house, Wimbledon Terry Pawson Architects

working details

A timber tower with a flush facade of glazed openings

To reflect the height of adjacent buildings and accommodate the narrow 5m site width, the front portion of the house is designed as a timber tower, four storeys high. Each floor, including the basement, contains a bedroom and bathroom.

The tower, which rests on a cast in situ concrete basement, was constructed on the platform frame system.Each storey - external walls of 100 x 50mm loadbearing timber studs with 12mm ply sheathing - was assembled on site, lifted into position and propped in place.The studwork cavities were insulated with mineral fibre batts.A suspended timber floor, which extends to the outside of the building, was then assembled on top and acted as a platform on which to construct the storey above.Lintels to the large glazed openings were formed of two or three 225 x 50mm joists bolted together.

The cladding of 20mmthick unseasoned English oak boards is fixed to vertical 32 x 50mm timber battens, creating a ventilated cavity.

The boards are bolted with pairs of M8 stainless-steel coach bolts and washers, fixed through oversized holes to accommodate movement.

They have chamfered edges to allow for thermal and moisture movement.

The oak cladding and the large glazed openings are designed as a flush and level facade. Each fixed glazed unit is set in a stainless-steel frame of 50 x 50mm angles with 32 x 25mm backing angles welded to the base. This creates a continuous rebate into which the glazed units are slotted and silicone bonded. At the sill, a series of levelling angles are welded to the bottom chord of the frame.The top of the oak cladding board is protected with a stainless steel drip.

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