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5Pavements are, however, more fit to be used in the open air, inasmuch as timbers expanding in a moist atmosphere, and contracting in a dry one, or sagging in the middle, cause defects in the pavement by their settlements. Moreover, frosts and ice soon ruin them. But as they are sometimes required, they must be made as follows. Over the first flooring, boards, others crossing them, must be laid, fastened with nails; thus giving a double covering to the beams. The pavement is composed of two parts of fresh rubbish, one of potsherds, and two of lime.
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