Building Construction
Single Flemish bond consists of

Double Flemish bond facing and header bond backing in each course
English bond facing and double Flemish bond backing in each course
Double Flemish bond facing and English bond backing in each course
Stretcher bond facing and double Flemish bond backing in each course

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Building Construction
Raft foundations are used for:

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

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