Roofing in the Pacific Islands

The islands of Polynesia, Melanesia and Micronesia share a tropical maritime climate with high rainfall, salt air and tropical cyclones. Traditional roofs used local timber, coconut fibre and leaf thatch; today corrugated metal sheet is the most common roof on houses and public buildings.

Traditional roofs

The Samoan fale is representative of western Polynesian building. It is round or oval with no walls, and its high domed roof is carried on timber posts. Before European contact no metal fasteners were used; the frame was lashed with ʻafa, a plaited coconut-husk sennit, and an ordinary fale used 30,000-50,000 ft (roughly 9-15 km) of it. Women made thatch from dried sugarcane leaves or coconut fronds, overlapped in a double layer, which lasted about seven years. Construction was led by master builders (tufuga fau fale).

Across the region, comparable buildings use pandanus, sago palm, coconut or grass thatch on timber or bamboo frames, often steeply pitched to shed rain quickly.

Change to metal

Corrugated iron spread with colonial trade, mission building and later aid programmes. In Samoa today, many small beach fale and village cookhouses have iron roofs, and many houses are rectangular rather than round. Metal roofs are quick to build and collect clean rainwater, but they are hot and noisy and corrode quickly near the sea.

Cyclones

Cyclone resistance is the main structural concern. Recommended practice includes hip roofs rather than tall gables, short overhangs on exposed sides, heavier-gauge sheeting with closely spaced screws and washers, and strapping that ties roof framing to walls and foundations. After major cyclones, regional "build back safer" programmes have focused on these fixing details.

Water

Roofs are a primary water source on many atolls and islands, feeding tanks and cisterns, so the roof material and its coatings matter for drinking-water quality.