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

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

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Building Construction
Mansard roof is a roof which slopes in

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

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