Senāsanakkhandhaka

Vinayapiṭaka · Cūḷavagga (2) · Vol. 7 · Section 206

[206] Now at that time the dwellings were roofed with grass; in the cold season they were cold, and in the hot season they were hot. They reported this matter to the Blessed One. "Bhikkhus, I allow you, having lashed down (the roofing), to make it plastered both inside and outside."

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 1 other place

Vol. 7 · Section 100 — Khuddakavatthukkhandhaka