Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
गृहादीनां गृहश्रावं क्रमशोऽष्टविधं स्मृतम् ।पांचालमानं वैदेहं कौरवं च कुजन्यकम् ॥ ५९४ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 594.
The roof slope of houses and the like is remembered as of eight kinds, in order. They are the Panchala measure, the Videha, the Kaurava and the Kujanyaka.
Simple meaning: Roof slopes come in eight kinds, named after lands. Four are named here.
मागधं शूरसेनं च गांधारावतिका स्मृतम् ।
The other four measures are named. The first has a rise of a quarter of the breadth.
पांचालमातुलानां च ह्युत्तरोत्तरवृद्धितः ।
Each roof measure rises higher than the one before it.
पांचालमानं सर्वेषां साधारणमतः परम् ।
Panchala is for all. Avanti is for Brahmins and Gandhara for Kshatriyas.