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The durability of this roofing system depends highly on harvest time, moisture, and organic matter build-up from the rain, tree cover, and animal droppings. Historically alang alang roofs would last up to 10 years, but because nowadays farmers are harvesting the grass before it is mature, the grass is weaker and therefore degrades faster. Alang-alang roofs need to be replaced every 3-7 years. The downfall of this roofing system is that it requires high maintenance. In Bali, today (2021), this roof costs around USD$15 – $17 (250,000 IDR) per sqm to build (this number fluctuates a little) making it quite affordable. Save this picture! Aldo's Kitchen / IBUKU. It has an incredible ability to breathe, and release warm air whilst keeping the air cool inside. Thermal insulation is the most attractive benefit of this roof type. Alang alang roofs are flexible and complement curvilinear roofs well.
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When installed the alang alang panels are tied to the rafters using a lashing technique with bamboo rope.įor a well-designed bamboo building that uses an alang alang roof, the roof pitch should be around 45 degrees for water to run off and we recommend that the rafters are installed no further than 60 cm apart to keep the roof from sagging. The bamboo split gives structure to the grass turning it into a panel whilst also acting as a roofing batten. Then, thatch panels of a maximum of 3 meters in length are made by folding the dry grass over a bamboo split and threading it onto the split using palm fiber. The Congo grass ( Imperata cylindrical) is harvested when mature and dried. Sustainability and Performance in ArchitectureĪlang-Alang roofs are a traditional thatch roofing technique used in Indonesia. The Future of Architectural Visualization