Roof ponding
Evaporative roof pond
Born in Punjab & hot North India, arid regions worldwide.
How it works
A shallow film of water on a flat roof evaporates through the day, carrying away heat before it conducts into the rooms below; some systems drain or cover the pond at night to release stored heat to the sky.
In a modern home
Roof-spray / roof-pond cooling, wet-jute roof covers, evaporative roof systems for top floors.
What it answers
Source
Harold Hay's Skytherm roof-pond experiments; Givoni on evaporative roof cooling.
Follow the threads
Broken-tile reflective roofshares roof heat, overheating, cool→Dry-stone corbelled roofshares overheating, roof heat, cool→Mudbrick catenary vaultshares roof heat, overheating, cool→Courtyard pools & fountainsshares overheating, cool with water, cool→Insulating & green roofsshares roof heat, overheating, cool→Lime-and-brick flat roofshares roof heat, overheating, cool→