四分律刪繁補闕行事鈔 2.197

2.197

Precept twenty: roofing a house beyond three tiers. There are four conditions: first, doing it for oneself; second, doing it oneself or having another do the roofing; third, reaching the third tier without leaving [the range of] sight and hearing before it is finished; fourth, transgressing upon completing up to the third tier.