Building Construction
The size of a floor tile commonly used, is

15 cm × 15 cm × 1.8 cm
22.5 × 22.5 cm × 2.2 cm
All listed here
20 cm × 20 cm × 2 cm

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Building Construction
Raft foundations are used for:

All listed here
Spanning over small soft or loose pockets
Counter acting the hydrostatic effect
Providing increased area of foundation over poor bearing capacity of soil

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