R C C Window Chajja Design. Goodreads helps you keep track of books you want to read. Indian traditional designs did not use an external skin, but provided deep overhangs like at Fatehpur Sikri or built external walls as perforated jaalis to reduce heat built-up as found in Jaisalmer.

A template maybe of wood or stone or RCC.
These are generally constructed in R.
Ideally, each window needs to have specifically designed element based on the orientation, sun directions, rain patterns, monsoon wind, sun If the chajja is to mainly serve the looks and elevations, the ordinary flat projection will adversely effect. Chajja - A sloping or horizontal structural overhang usually provided over openings on external walls for protection from sun and rain. And in this respect Claude Batley's The Design Development of Indian Architecture is a pioneering work on Indian architecture which has continued to influence generations of students and scholars of the subject.