| Merbau Wood
Local names : Merbau, Merbo, Maharau, Sekka, Pas
Botanical name : Intsia spp., famili Caesalpiniaceae (I.bijuga O Ktze & I. palembanica Miq.)
Natural durability : Very Good, Class I - II
Resistance to insect and fungi : resists to termites and woodworms
Color : brown to dark brown reddish yellow, almost black
Use : Main structure, decking
Bangkirai Wood
Local names : Bangkirai, Benuas, Aggelam
Botanical name : Shorea laevis Ridl. (Syn. S. laevifolia Endert), family Dipterocarpaceae
Natural durability : Very Good, Class I - II
Resistance to insect and fungi : Class III
Color : Yellow-brown,
Use : Main structure, flooring, wall-panel, door&window, decking
Iron Wood
Local names : Ulin, Kajoe Besi, Borneo ironwood
Scientific name : Eusideroxylon Zwageri Teeijsm & Binn
Family : Laureaceae
Natural durability : Very Good, Class 1
Resistance to insect and fungi : resists to termites and woodworms
Color : brown yellow to brown reddish yellow, darkens in time with some green glossy glints.
Density at 12% humidity : 830-1040 kg/m3 (very heavy)
Use : Main Structure and Roofing (Shingle)
Alang-Alang (Thatched)
Alang-alang thatching has been used for hundreds of years on the island of Bali as a traditional form of roofing. Alang-alang is made from the grass Imperata Cylindrica and is called alang in Bahasa Indonesia and Malay.
Alang-alang is still made in the same traditional way and are often constructed using bamboo rafters, although nowadays timber is becoming more common - although more expensive. The peak of the roof is usually finished with decorative terracotta "crown." The eaves can then either be cut horizontally to form a straight fringe, or left uncut with the grass drooping Tahitian style.
Alang-alang is a good insulation against heat and is extremely attractive to look at, both from the inside and outside. It is also very durable, in some cases lasting for up to twenty years although the usual life-span is around six to eight years.
Many factors affect the life span of alang-alang, which is a natural organic material and under a constant process of decomposition. Factors include the quality for the material, the pitch of the roof and whether there is water from an upper roof falling on it.
Alang-alang roofs require no finishing or maintenance however a spraying with varnish on the inside will enhance their appearance.
Use : Roofing
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