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A cantilevered EPDM clad bath enclosure

working details

The original single-storey house was of timber frame construction, with a masonry chimney. Cladding and roofing were removed and the timber frame rebuilt and extended. The insulated pitched roof was braced with steel tie rods and clad with EPDM (ethylene propylene diene monomer) membrane. The walls were insulated with mineral wool and clad internally with spruce ply, and externally with standard-grade (WBP) external ply and EPDM. At the windows the ply cladding extends to conceal the timber frames.

The wall and the roof cladding of black Prelasti EPDM synthetic rubber membrane - stretchable, waterproof yet vapour-permeable - is generally used as a roof covering. The 1.2mm-thick EPDM cladding to each facade was pre-cut with window and door openings, and the seams vulcanised in the factory before being delivered to site. It was then fixed to the 18mm WBP ply with contact adhesive. At its edges the EPDM membrane was fixed to a concealed 40 x 40mm aluminium angle to form a drip. For extra protec - tion, preformed EPDM corner pieces are at the lintel/ jamb corners of the windows.

The bath is contained in a can - tilevered 'box' projecting from the side of the house.

This box is constructed as a 70 x 70mm RSA-and-SHS steel frame, fixed back to concrete pads with 60.3mm CHS diagonals. The steel frame is infilled with studwork and insulation and clad internally and externally with ply - wood. The edge of the bath is lined with ply, which conceals the frame of the continuous window slot.

WC and basin outlets are concealed behind removable ply panels, creating a deep wall that accommodates a cabinet with a hinged ply door and a perforated ply screen to the window.

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