Building Construction
Mansard roof is a roof which slopes in

Four directions with break in the slope on each side
Two directions without break in the slope on each side
Four directions without break in the slope on each side
Two directions with break in the slope on each side

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Building Construction
Rotary drilling

All listed here
Is not economical for holes of less than 10 cm
Hinders the ground water observations and permeability test
Is not suitable for deposits containing very coarse gravel

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