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A fir-clad, steel-framed public WC building

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working details

The WC building illustrated here is the Brockenhurst version; the walls are clad with vertical Douglas fir boards on battens and the paired pitched roofs are at a steeper pitch than the Lymington WC.

The building is constructed from a basic 'kit of parts', which can be adapted to suit specific sites and requirements. It has a steel frame construction;

a series of 152 x 89mm RHS columns infilled with solid aerated concrete blockwork walls. At their bases the columns are set on galvanised 76mmdiameter CHS stub columns, which create an air gap all round the build - ing, raising the walls clear of the floor for ease of cleaning and mainte - nance.

At the eaves a steel T-shaped section slots into the top of the blockwork wall. The section has a flat steel plate welded to it, which acts as a composite ring beam and supports a series of galvanised 76mm-diameter CHS stub columns. They create a ventilation gap at each side, avoiding the need for mechanical ventilation, and support a 152 x 152mm UC perimeter eaves beam.

A portal frame pitched-roof structure rests on the perimeter beam; it comprises 127 x 76mm I-shaped steel sections and 76mm-diameter CHS horizontal struts.

The lantern is topped with frameless 12mm toughened glass panels fixed with stainless-steel bolts to the roof structure and jointed with silicone.

The pitched roofs are covered with a pre-patinated Rheinzink roof with standing seams that drains into a gut - ter made of similar material. The roof of the central service duct is a single layer membrane.

Although the building is not heated, the roof is insulated to act as a thermal damper and to stifle the noise of rain drum - ming on the roof.

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