BernieC, the collective noun for such roofing, in Borneo at least, was 'Attap'. Wiki redirects that to Nypa, a fruitican also known as the Nipa Palm. Prevalent throughout the Indian and Pacific Ocean areas, its leaves are excellent for thatching uses as Warmtoast says. Wiki, as ever, tells all:-
https://en.wikipedia.org/wiki/Nypa_fruticans
A favourite haunt for Beetles, they came cascading down onto the floor when you all jumped up and down in unison to Bert Kaempfurt's 'Swinging Safari' set at full volume, but that's another story...