[gr8fl4porsche]

I did it 15 years ago. I painted my hot tar flat roof with off white elastomeric paint I had leftover from a job.

When we started the project, you could not touch the black roof - it was extremely hot.

When we were finished, you could hold you hand on the roof and it was merely warm.

Inside temps in a non insulated, non attic building went down almost 10 degrees.
All the ac units worked much better and obviously ran less.

I always wondered why people still put dark roof shingles on. The lighter colors are less attractive but make much more sense.

Commercial flat roofs have been white around here for some time.