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PRECAST CONCRETE CLADDING PANELS

CONCRETE QUARTERLY/ AUTUMN 05 - WORKING DETAILS - CHERRY ORCHARD

The housing block is a typical four-storey unit. Apart from the cast-concrete ground slab, all the internal floor slabs, walls and external cladding are factory-made, 150mm-thick, precast-concrete panels. Once the ground slab is cast and a nominal 75mm screed laid, wall panels are erected with threaded dowel-bar connections to the slab. Envelope panels stack up on top of each other with side connection to the slab. Internal panels are fixed with bars (at approximately 1,500mm centres) to the precast slab at each level Envelope panels are of different sizes to suit elevation treatment. The entrance elevation shown here consists of eight panels with a maximum size of 6,000 x 3,950mm. The ground floor panels are bolted to the ground slab with dowelbar connections and then bolted against the first-floor slab with angle brackets. The first-fl oor external panels are then lowered and connected to the panel below with three threaded dowel bars per panel and again connected to the slab at their head with angle brackets. Both horizontal and vertical joints between panels are sealed with two layers of silicone sealant.

Panels are precast with all openings for windows, doors, service routes and rebates for waterproofing details. They are pre-finished in the factory with a 3mm self-coloured acrylic render to the external face.

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