I have the exact same problem - live on the top floor and the roof is flat, red colored tiles. My neighbors side has some kind of raised sealant but my side is just the tiles - hence it gets like an oven inside at times. This is a rental so I don't want to expend a huge amount of money - are there any paint like options to reflect back the heat? I'm wondering if just painting the roof tiles glossy white would help? Thoughts anyone? Karlheinz