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Some basic points regarding raft foundation are as under: - It is generally provided for the building or other structures having heavy superstructure loads, low soil bearing capacity, smaller column/frame spacing or a combination thereof. - General design and detailing is similar to a floor slab, except that loads and reinforcement locations are inverted. - Raft foundation will be uneconomical, if the loads are smaller or bearing capacity is not too low. You may get more detailed and to the point advice, by providing some specific details of the the house, like - common & maximum room sizes, - number of stories - Whether framed structure (with maximum column spacing), or load-bearing wall structure, - material of construction - type of loads to be considered - allowable soil bearing pressure, etc. Following threads may also give you some insight regarding the design of raft foundation for building structures: 1. http://www.sepakistan.com/topic/1440-raft-design-for-a-2-basementg24-story-building/?hl=raft 2. http://www.sepakistan.com/topic/160-minimum-thickness-of-footing/?hl=raft Hope this helps to some extent. Regards

1. Joint B/C check is not done for low seismic zones. Its beam column joint capacity.

Khalid, You might want to look at this thread too for long term deflection: http://www.sepakistan.com/topic/85-long-term-deflection-multiplier/ Regarding 1), I am not sure as I have been out of commercial building engineering and using ETABS for more than 5 years. Other people may be better able to answer you on that. Thanks.