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Shingles or 'sirap' are one of the traditional roofing materials of Indonesia. Ironwood is known locally as Kayu Besi or Ulin. It is one of the world's most durable timbers used in timber shingles.

Originating from Kalimantan (Borneo) they have been used for hundreds of years by the locals there for traditional housing.

The roof has four overlapping layers of shingles. It has a serviceable lifespan of at lleast thirty years.