Building Construction I Sofia Sebastian 1

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Presentation transcript:

Building Construction I Sofia Sebastian 1 Roofs Building Construction I Sofia Sebastian 1

Building Construction I Sofia Sebastian 2 Flat RC Roof Flat roofs – timber or reinforced concrete Advantages of flat roofs Easy to put up Create extra usable space if they are accessible Easily maintained They lose heat A reinforced concrete roof is built exactly like a reinforced concrete floor slab Solid or hollow pot construction Disadvantages of flat roofs They are not as weather proof as pitched roofs The finishes do not last as long as roof tiles Building Construction I Sofia Sebastian 2

Building Construction I Sofia Sebastian 3 Flat RC Roof The top of the structural slab for a flat reinforced concrete roof is laid level Fall – 1:80 The falls are provided by a cement and sand screed that has the correct slope Finishing off a flat reinforced concrete roof The edges of a flat reinforced concrete roof can be finished off by constructing An overhanging roof that takes the edge of the roof over the surface of the external wall A parapet roof that extends the edge of the external wall higher than the roof Building Construction I Sofia Sebastian 3

Building Construction I Sofia Sebastian 4 Finishing off a flat reinforced concrete roof Overhanging roof Building Construction I Sofia Sebastian 4

Building Construction I Sofia Sebastian 5 Finishing off a flat reinforced concrete roof Parapet roof Building Construction I Sofia Sebastian 5

Building Construction I Sofia Sebastian 6 Flat RC Roof Finishing off a parapet roof Copings – short sections of concrete fitted together, finish off the top of the exposed external wall of a parapet roof and shed rain Coping are bedded in a dpc of bituminous felt to improve their water resistance Copings should be wide enough o overhang the wall by at least 50mm The tops of the copings slope in one or two directions to shed rain Building Construction I Sofia Sebastian 6

Building Construction I Sofia Sebastian 7 Flat RC Roof - Water proof roof finishes 1. Bituminous felt – sheet material with a fibrous base soaked in bitumen. Usually laid on timber roofs 2. Mastic asphalt as laid on roof – is a mixture of graded limestone bonded with asphaltic cement to form water proof material that is plastic when heated. Mastic asphalt – material containing bitumen that is laid as a hot elastic covering. As it cools, it hardens to form a joint less cover that is usually put on concrete roofs. Building Construction I Sofia Sebastian 7

Building Construction I Sofia Sebastian 8 Water proof roof finishes – Laying a bituminous felt roof Building Construction I Sofia Sebastian 8

Building Construction I Sofia Sebastian 9 Details of the junction on a flat roof The upstand The verge Building Construction I Sofia Sebastian 9

Building Construction I Sofia Sebastian 10 Details of the junction on a flat roof The soil vent pipe Building Construction I Sofia Sebastian 10

Building Construction I Sofia Sebastian 11 Details of the junction on a flat roof The rain water pipe Building Construction I Sofia Sebastian 11