The minimum thickness of walls built in cement mortar (1 : 6) for a single storey building is 15 cm. This is according to the Indian Standard Code of Practice for Load Bearing Brick Masonry (IS 1786-2012). The code states that the minimum thickness of walls should be 15 cm for single storey buildings and 20 cm for two storey buildings. The thickness of the wall is important to ensure that it is strong enough to support the weight of the building and its contents.
Option A: 10 cm is not the minimum thickness of walls built in cement mortar (1 : 6) for a single storey building. The minimum thickness is 15 cm.
Option B: 15 cm is the minimum thickness of walls built in cement mortar (1 : 6) for a single storey building. This is according to the Indian Standard Code of Practice for Load Bearing Brick Masonry (IS 1786-2012).
Option C: 20 cm is the minimum thickness of walls built in cement mortar (1 : 6) for a two storey building. This is according to the Indian Standard Code of Practice for Load Bearing Brick Masonry (IS 1786-2012).
Option D: 25 cm is not a standard thickness for walls built in cement mortar (1 : 6). The minimum thickness is 15 cm for single storey buildings and 20 cm for two storey buildings.