This type of roof is used especially used in Bengal to cover verandahs and so get the name as Bengal Terrace Roof. This type of roof consists of rafters, battens, flat tiles and final finish.
At first the rafters are placed in position, sloping outwards from main wall at a spacing of 30–50 cm centre-to-centre, Fig. 25.12. One end of the rafters is inserted into the wall for length of 30 cm.
Figure 25.12 Bengal terrace roof
Battens or repairs of 5 cm × 1 cm are fixed to the upper surface of the rafters perpendicularly with a spacing of 15 cm. On the battens, a course of flat tiles well soaked in white-wash is placed in lime or cement mortar.
Finally the roof is finished by adopting any one of the following methods:
- Two courses of flat tiles are laid on mortar and finished finally with two or three coats of plaster out of which the last coat is rubbed smooth and polished.
- Over the first course of tiles, a layer of fine jelly concrete of 4–5 cm thick is laid. Over this concrete layer one more course of flat tiles is laid and the surface is finally finished with two or three coats of plaster. The outer most surface is rubbed smooth and polished.
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