I've been told that bubble radiant barriers work better than normal ones. Any truth in that? They are more expensive though.

If the entire neighbourhood's houses have their roofs painted white, I would do the same.. but not if I'm the only one

"Branded" reflective sheets like Parsec Thermo-Brite III actually costs more than foil wrapped bubble sheets. I guess you must always have air space in between the sheets and the tiles, and have ventilation tiles to allow the heat to escape.

I was quoted RM 1.20 per sq feet for bubble sheets(without installation), anybody could share their cost for their sheet insulation?