2 Section through street facade scale 1:20
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1 waterproof, moisture-diffusing coating 2 sheet-metal covering to 1 % slope 3 305 mm exposed concrete, sealed self-adhesive sealing layer 76 mm lam. rigid-foam PIR insulation between galvanised steel angles (angles adhesive fixed on outer faces with sealing strips) bearing structure: galvanised steel rails galvanised expanded-metal mesh as plaster lathing, lined with paper on rear face 25 mm elastomer rendering 4 610 mm substrate layer; filter mat 51 mm gravel drainage layer 6 mm protective mat 2≈ 51 mm exp. polystyrene thermal insulation drainage layer root barrier impermeable coating sloped lightweight concrete reinforced concrete slab 76 mm sprayed foam thermal insulation cold fluid applied waterproofing membrane gypsum plasterboard suspended ceiling 5 305 mm exposed concrete, sealed 76 mm foamed thermal insulation cold fluid applied waterproofing membrane channel-section supports to dry construction gypsum plasterboard, painted 6 teak door 7 teak threshold 8 102 – 203 mm substrate layer; filter mat 2≈ 51 mm polystyrene thermal insulation drainage layer root barrier impermeable coating sloped lightweight concrete reinforced concrete floor 76 mm sprayed foam thermal insulation drawn under soffit 914 mm inside facade cold fluid applied waterproofing membrane gypsum plasterboard suspended ceiling 9 102 – 203 mm layer of gravel, with galvanised steel angle divisions 10 triple glazing in solid teak window frame 11 white acrylic-bonded mineral cladding to sill 12 radiant heating loop at edge of floor slab to minimise thermal bridges (automatically controlled) 13 concrete flooring 14 dual-purpose blind (antiglare, blackout)
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A Execution plan (mock-up) B Photo showing finished concrete texture Formwork boards 8 inches (20.3 cm) wide in standard lengths of 10, 12, 14 and 16 feet (305 – 488 cm) were laid next to each other in random order – not unlike wood-strip flooring – to create staggered vertical joints. The quality of the lightly sealed pine boards was precisely specified in order to obtain the desired texture, including knots. The tongued-and-grooved joints of the boarding restrict shrinkage and resultant discolouration. Firmly sealed joints between boards resist the pressure of the highly fluid concrete mix and ensure precise edges and arrises. A very careful planning and execution of the boarded formwork was necessary, therefore. Conically shaped PVC members create small, precise tie holes. The grout filling inside each hole is slightly recessed. The holes were laid out at regular intervals along vertical axes between the window openings in accordance with standard formwork construction. In addition, for optical reasons and to ensure a good sealing effect during the pouring process, the holes were positioned close to the central axes of the boards.
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