Sirap
Definition
Wooden roof shingles split from ulin (ironwood) or belian timber, used as a traditional roofing material in Kalimantan and parts of Sulawesi. Sirap shingles are typically 40–60 cm long and 5–10 mm thick, overlapped in courses like slate. Ulin sirap is exceptionally durable — lasting 50 years or more in tropical conditions — and was the primary roofing material for important traditional buildings in Borneo before corrugated iron replaced it in common use.
Example
The restoration of traditional Banjar palace buildings in South Kalimantan uses sirap from ulin timber for the roof surface — the dark, weathered shingles providing both historical authenticity and genuine weather performance that modern materials cannot replicate in the same visual register.