I am installing a composite deck (trex) on top of a garage with a flat roof. I am looking for a way to fasten the 1x4 pressure treated wood which I'm using as sleepers to the roof top without puncturing the roof.
I saw an episode of Hometime where they did this on Miriam's flat roof. They didn't fasten the sleepers down at all. They rested them on an extra piece of roofing.