I'd like to insulate roof which is over my flat in 4 store building. MY flat is the last one and every summer is a killer for me as about for 1 month a year I have constant temperature of 30 Celsius. The roof is flat (actually 2% inclination) and currently covered with roofing felt.
I'm thinking about covering it with a layer of gravel or making a roof garden on it. Whole roof is about 100 square meters.
EDIT: one of comments led me to http://www.whiteroofproject.org/.