Nipa palm; palm shingles.
Nipa fruticans
It makes good roofing material. The leaflets are cut off from the midrib and individually folded over a strip of bamboo. They are folded in such a way that one end is a bit longer than the other. Each leaflet overlaps slightly with the next. They are sewn near the bamboo strip. Each shingle is approx. 1 m long.
Nipa is strong for making a roof.