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Tritisan
THEORY & MATHEMATICSbeginner
Definition
A wide roof overhang or eave extension that projects beyond the building wall to shade the facade from direct solar radiation and protect it from rain. Tritisan is a defining element of Indonesian vernacular architecture — the depth of the overhang is calibrated to the sun angle, shading walls and openings during the high tropical sun while allowing lower-angle light and breeze to enter. It also protects the wall-to-foundation joint from driving rain.
Example
Traditional Javanese houses extend the tritisan 1–2 metres beyond the wall face, creating a covered transitional zone between inside and outside that functions as an outdoor sitting and working space during rain while remaining ventilated.