When thou buildest a new house. — Obviously the Law refers to houses with flat roofs, upon which it was customary to walk (1 Samuel 9:25-26; 2 Samuel 11:2).
Related Commentaries of Deuteronomy 22:8
Deuteronomy 22:8
8 When thou buildest a new house, then thou shalt make a battlement for thy roof, that thou bring not blood upon thine house, if any man fall from thence.