The roof of the house, a sloping 250mm-thick concrete slab, rises from ground level on the north side to a flat roof terrace over the first-floor living room on the south side. The central part of the roof is overlaid with a concrete staircase which gives access to the terrace; the roof at each side of the staircase slopes down to the eaves, and is overlaid with an impermeable membrane on rigid insulation, topped with polished 50mm black-pigmented concrete with stone chippings.
The roof and first-floor slab, both of cast in-situ concrete, are supported by a structure of steel columns. The blockwork walls, a 50mm inner leaf and a 90mm outer leaf, are lined with insulation and a waterproof membrane, and clad with a ventilated rainscreen of cement particle board, fixed back to the blockwork.
A series of tall narrow windows runs along the west elevation. Each window - a 400mm fixed light and a 900mm-wide inward-opening light - is screened internally by a white lacquered MDF shutter door which slides between the inner and outer blockwork leaves when not in use.
By Susan Dawson Editor's note: This detail is published to demonstrate the principles of a sliding shutter door and rainscreen wall. The house is in Spain, where construction regulations are significantly different to the UK Building Regulations.