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.
Kalimantan (Borneo) they have been used for hundreds of
years by the locals there for
The roof has four
overlapping layers of shingles. It has a serviceable
lifespan of at least thirty years.