The buildings are situated across the slope and are accessed from the north on the upper floor level, which offers a beautiful view towards the first hills of the Jura Mountains. Tile roofs only work for linear buildings and maintenance is pretty minimal some clearing of organic matter and replacing broken tiles that might have encountered impact from a fallen branch.The two houses “Im Wygärtli” designed by Beck + Oser Architekten are located in a villa garden on the southern hillside of Hofstetten. Battens (or laths) must be added to hold the tiles over the rafters. For a well-designed bamboo building using a tile roof, we recommend a minimum roof pitch of 35-degrees and rafters should not be placed more than 30 cm apart. Terracotta tiled roofs are very heavy and therefore during design, this added load must be accounted for. Roofs of this kind can last for 100 years. Terracotta tiles are the most durable roofing material.

The bamboo degrades quickly if it is exposed to moisture or organic matter. This roofing system also requires high maintenance and needs to be replaced every 5 years. We use Gigantochloa apus poles for this roofing and Dendrocalamus asper to cover the roof ridge.

This roof works with slightly curvilinear and small structures, but it is hard to use this technique for large and complicated curved roofs. To make your bamboo building last longer, you can also use 3 layers, the first layer woven bamboo mats locally known as bedeg over the rafters for interior aesthetics, then asphalt linear and cladding of half bamboo as a final layer. Finally, the roof ridge should be covered properly. For a well-designed bamboo building using halved bamboo, the roof needs a minimum roof pitch of 40 degrees and the rafters should not be placed further than 60 cm apart from one another. The halved bamboo roof is made up of freshly harvested bamboo poles split into two halves and placed in an interlocking sequence similar to a Spanish tile roofing technique. 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.

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. Alang-Alang roofs are a traditional thatch roofing technique used in Indonesia.

Curve house roofs