Deuteronomy 22:8

Any Roof Must Have A Protecting Parapet To Prevent People From Falling (Deuteronomy 22:8).

Here the idea was of thoughtfulness of the dangers we can put others in by carelessness with regard to safety. The roof would be a flat one that people would entertain on. Sometimes therefore they might be a bit tipsy. Every Israelite should be concerned for the preservation of all members of the covenant by all means, and for not defiling Yahweh's land by spilling blood. The stress is on consideration for others.

Deuteronomy 22:8

‘ When you build a new house, then you shall make a parapet for your roof, so that you do not bring blood on your house, if any man fall from there.'

In all construction concern was to be shown to ensure that it was not dangerous to others, and to make it as safe as possible. They were to be concerned for each other's welfare. This was especially so in order to prevent the spilling of blood. Thus all Israelite houses had to have a parapet. If they did not, and a man died through their negligence then innocent blood would have been spilled and the owners would bear the guilt before God. They might even be found guilty of manslaughter.