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A TIMBER BUILDING WITH A 'LAYERED' FACADE

WORKING DETAILS - SAWMILLS

The new showroom/reception, a 26.5 x 9m single-storey extension on the south wall of the sawmills, was designed to make maximum use of its own timber products.

The facades are 'layered' to articulate the elements from which they are composed. On the main, south-west elevation, the outer layer is a series of vertical, western red cedar fins, which run in front of the glazed wall: during the day, they help to reduce solar gain and glare, and create a changing pattern of reections inside; at night they add security and make an attractive screen through which the illuminated interior is seen.

The 145 x 35mm fins are - xed by 'gravity' rails; a set of eight fins, connected by a horizontal timber fillet at top and bottom, and screwed to an interlocking fillet which is fixed to the wall.

The structure (pairs of standard prefabricated gang-nail trusses) is exposed and runs just inside the glazing. Roof joists span between top chords of trusses and support timber firrings.

The solid walls which ank the glazing consist of insulated timber studwork, lined on the inside with 18mm oriented strand boards (OSB) and on the outside with horizontal 18mm shiplap western red cedar boards. Floor and ceiling are made of OSB panels, finished with a clear and fire-resistant coating. Sill-level heating emerges through slots routed in the OSB oor strip between the glass and the trusses.

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