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I have installed a radiant barrier on the underside of most of my roof. I stapled it to the bottom of the roof trusses. Since my roof has a rather shallow pitch of 3 in 12, which is typical for a lot of older Florida houses, I couldn't do this closer than about within 2 feet of the eaves, since that is where the roof trusses overlap the ceiling joists. Since my house is only 24 feet wide and has a hip roof, that leaves about 20 % of the roof with no radiant barrier.
Still, it probably reduces the attic temperatures during the hottest part of the summer by about 20 degrees F. It is noticeably cooler in the attic, but it's still hot up there. So additional insulation on top the ceilings is still needed.
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