<img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a36199c7e80680e0482eajpeg.jpg" alt="" width="1300" height="950"/>One of the lessons not learnt from the earthquake four years ago is the possibility to re-use and up-cycle bricks, metal and timber for reconstruction instead of buying expensive imported material. But it is still not too late.Traditionally, Nepalis have <a href="https://www.nepalitimes.com/banner/learning-from-nepals-past-to-rebuild-its-future/" target="_blank" rel="noopener">reused building material for temples</a>, or homes, salvaging and recycling them after every earthquake in the past. Nearly 700,000 houses went down in the 2015 quakes, leaving a huge amount of stone, <a href="https://archive.nepalitimes.com/article/nation/Building,370" target="_blank" rel="noopener">bricks, useful mud mortar, timber and roof tiles.</a><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a361c9c7e80680e0482ebjpeg.jpg" alt="" width="1000" height="454">In the immediate aftermath of the earthquake on 25 April 2015, survivors quickly built temporary shelters made of bamboo, tarpaulins, planks, corrugated steel sheets and anything else available. Relief agencies supplied corrugated steel sheets, some of which were barely 0.2mm thick and could be bent into semi-circles to make shelters.Read also:<a style="letter-spacing: 0.15px; font-weight: bold; background-color: #ffffff;" href="https://www.nepalitimes.com/?p=25092&amp;preview=true" target="_blank" rel="noopener">Lessons Unlearnt</a>, Editorial<a style="background-color: #ffffff; font-size: 15px; letter-spacing: 0.01em;" href="https://www.nepalitimes.com/?p=25101&amp;preview=true" target="_blank" rel="noopener">Nepal's traditional seismic resistant designs</a>, Sheilin Teo<a href="https://www.nepalitimes.com/here-now/tall-order/" target="_blank" rel="noopener">Tall order</a>, Sewa Bhattarai and Prakriti Kandel<img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a361d9c7e80680e0482ecjpeg.jpg" alt="" width="823" height="772"><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a361f9c7e80680e0482edjpeg.jpg" alt="" width="807" height="915"><figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a36229c7e80680e0482eejpeg.jpg" alt="" width="640" height="481"><figcaption> </figcaption></figure>Soon, the temperature in the low valleys rose to 36oC, and the space under the metal became ovens. Temporary schools also overheated, and there were reports of children dehydrating and fainting. Once the <a href="http://archive.nepalitimes.com/article/editorial/monsoon-challenging-for-a-post-earthquake-Nepal,2280" target="_blank" rel="noopener">monsoon</a> came, the sound of rain on the tin roofs made teaching impossible. Strong winds tore the paper-thin steel sheets loose, turning them into flying guillotines.Poor families had no other option than to stay in their <a href="http://archive.nepalitimes.com/blogs/thebrief/2015/05/12/moving-to-safer-shelters/" target="_blank" rel="noopener">temporary makeshift houses</a>, turning a large part of Central Nepal into slums. These were not homes.Our Sustainable Mountain Architecture (SMA) team came up with an alternative design for transitional homes, made from salvaged material and locally grown bamboo or thatch. The base of the single-storey house is a thick, heavy stone wall; the main structure re-uses <a href="https://archive.nepalitimes.com/article/nation/community-forest-comes-in-handy-earthquake-reconstruction,2927" target="_blank" rel="noopener">timber</a> columns, beams and rafters of the family house that came down.The top part of the walls and the roof are made of lighter material, the horizontal timber tie beams had new metal wires to act as stabilising cross-bracing so they were stronger. Salvaged planks or bamboo, and the compulsory involvement of family members in the building process guaranteed ownership of the transitional homes built for only Rs40,000 each.Read also: <a href="https://www.nepalitimes.com/?p=25110&amp;preview=true" target="_blank" rel="noopener">Shaking up the health sector</a>, Sewa Bhattarai<a style="background-color: #ffffff; font-size: 15px; letter-spacing: 0.01em;" href="https://www.nepalitimes.com/?p=25119&amp;preview=true" target="_blank" rel="noopener">Quake was a learning experience for Nepal’s schools</a>, Prakriti Kandel<img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a36259c7e80680e0482efjpeg.jpg" alt="" width="1170" height="886"><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a36279c7e80680e0482f0jpeg.jpg" alt="" width="1297" height="918">However, after relief money was allocated for the removal of material from ruined houses excellent raw material that could have been used for construction were taken away. Once the government got its act together, it dictated the usage of concrete.Heaps of local building material was wasted, while salvaged timber started to rot in the rain. Families who could afford it started building reinforced concrete houses. This has been a boom time for the cement and rebar industry. Brick infill walls were made in concrete structures, providing business to polluting brick kilns baking Kathmandu’s fertile topsoil. All this new building material had to be transported by trucks spewing black soot.A more permanent design by the SMA team used salvaged material from a collapsed building to make a two-storey model house at the <a href="https://archive.nepalitimes.com/article/nation/community-forest-comes-in-handy-earthquake-reconstruction,2927" target="_blank" rel="noopener">ICIMOD</a> Knowledge Park in Godavari, to demonstrate quake-resistance design for rural Nepal.Read also: <a href="https://www.nepalitimes.com/opinion/nepal-is-being-loved-to-death/" target="_blank" rel="noopener">Nepal is being loved to death</a>, Anil Chitrakar<a style="background-color: #ffffff; font-size: 15px; letter-spacing: 0.01em;" href="https://www.nepalitimes.com/banner/nirmala-pariyars-2nd-life/" target="_blank" rel="noopener">Nirmala Pariyar's 2nd life</a>, Ramu Sapkota<img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a362a9c7e80680e0482f1jpeg.jpg" alt="" width="800" height="879">For retaining warmth in winter, the house — at 1,500m — uses a south-facing asymmetrical saddle roof for passive solar energy gain. While most buildings in Nepal are now using thin, 0.25mm corrugated steel sheet for the roof, we looked for a more robust solution, re-using bottoms of scrap tar drums 60cm in diameter and 1.2mm thick. The completed house rests on a concrete ring beam, the only place where cement is used.The upper floor is lightweight with timber structure and double wattle and daub walls. These jut out slightly from the lower stone wall with timber tie reinforcements. The largest upper floor span of 6m is made by one steel I-beam, to conserve trees.Sapana Shakya and Aman Raj Khatakho are architects with Sustainable Mountain Architecture, a Nepali non-profit founded by Anne Feenstra, a Laureate of the Global Award for Sustainable Architecture 2012 (Paris) to promote innovative pro-people, pro-ecology, pro-local building techniques.<img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a362d9c7e80680e0482f2jpeg.jpg" alt="" width="1154" height="666"><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a362f9c7e80680e0482f3jpeg.jpg" alt="" width="1153" height="896">BEST USE IS REUSEPost-earthquake most buildings tend to use reinforced concrete because of the misconception that houses built with traditional techniques and materials will not be strong.However, with innovation and the right design, the non-profit Sustainable Mountain Architecture has built this model house that uses local material and style to build durable and eco-friendly homes.This model house is easily replicable, uses local labour and technology, and salvaged material.The windows and doors of the model house face south. The southern wall is taller, which means the house gets plenty of sun in winter. The passive solar energy that enters the house is trapped in the walls. Double glazing on windows prevents heat from escaping.

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Building back cheaper and stronger

<figure><img width="800" height="1067" src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a360a9c7e80680e0482e4jpeg.jpg" alt=""/><figcaption>ANASTYLOSIS: Decorated resting platform (pati) in Kathmandu being rebuilt using traditional materials and methods. Photos: SHEILIN TEO</figcaption></figure>After the April 2015 earthquake, the National Reconstruction Authority (NRA) released two manuals to address the repair and retrofit of masonry and reinforced concrete structures. Later, it added an updated guideline for masonry structures. The NRA advisory is consistent with international approaches for earthquake-resistant houses, with a focus on using new, commercial products available in the construction market. But we can also learn a lot from Kathmandu Valley’s <a href="https://www.nepalitimes.com/banner/learning-from-nepals-past-to-rebuild-its-future/" target="_blank" rel="noopener">historical building traditions</a> about alternative designs.<img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a360d9c7e80680e0482e5jpeg.jpg" alt="" width="1000" height="454">There are many ways of building resilience into structures, but the most historically prevalent and still important today is flexibility. Strong but flexible jointing of ductile and appropriately-sized structural members that hold a building together allow it to sway with movement loads during an earthquake, making it less likely to collapse. Read also: <a style="background-color: #ffffff; letter-spacing: 0.15px; font-weight: bold;" href="https://www.nepalitimes.com/?p=25092&amp;preview=true" target="_blank" rel="noopener">Lessons Unlearnt</a>, Editorial<a style="background-color: #ffffff; font-size: 15px; letter-spacing: 0.01em;" href="https://www.nepalitimes.com/?p=25102&amp;preview=true" target="_blank" rel="noopener">Building back cheaper and stronger</a>, Sapana Shakya and Aman Raj Khatakho<a style="background-color: #ffffff; font-size: 15px; letter-spacing: 0.01em;" href="https://www.nepalitimes.com/here-now/tall-order/" target="_blank" rel="noopener">Tall order</a>, Sewa Bhattarai and Prakriti Kandel <figure><img width="800" height="800" src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a360e9c7e80680e0482e6jpeg.jpg" alt=""><figcaption> </figcaption></figure>Such design is seen in old timber-framed  and intricately jointed buildings in Japan and China, and also in structures across Nepal. For example, roof rafters are jointed to ridge poles and wall plates to allow a pivoting motion that helps isolate the roof structure from the rest of the building in case of ground movement. Traditionally, buildings in Nepal were constructed with timber and brick walls. Timber is now a scarce resource, and masonry has fallen out of favour in the face of the militant march of concrete. From the plains to the mountains, buildings were made of stone, timber, mud, bricks, thatch and tiles.Read also: <a href="https://www.nepalitimes.com/?p=25110&amp;preview=true" target="_blank" rel="noopener">Shaking up the health sector</a>, Sewa Bhattarai<a style="background-color: #ffffff; font-size: 15px; letter-spacing: 0.01em;" href="https://www.nepalitimes.com/?p=25119&amp;preview=true" target="_blank" rel="noopener">Quake was a learning experience for Nepal’s schools</a>, Prakriti Kandel <figure><img width="800" height="1000" src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a36109c7e80680e0482e7jpeg.jpg" alt=""><figcaption> </figcaption></figure>Just as the frames and jointing were made to be flexible, the walls were thick, rigid and robust, which is another stabilisation technique. These days, because building with <a href="http://archive.nepalitimes.com/article/nation/A-concrete-future,2251" target="_blank" rel="noopener">concrete</a> and bricks means walls are thinner and weaker, corner ties and banding can help keep flimsier walls intact. Other earthquake-resilient building techniques include lightweight roofing, which in the past was done with wood and bamboo sub-structures to thatched roofs — especially in the Tarai — and triangulation, seen today in trusses and pitched forms, traditional Newari scroll capitals and decorated tundaal (struts).At a seminar this month on seismic risk organised by the National Society for Earthquake Technology and the United States Geological Survey, experts said Nepal had a strong tradition of resilient construction.<a style="background-color: #ffffff; letter-spacing: 0.01em; font-size: 15px;" href="https://www.nepalitimes.com/banner/nirmala-pariyars-2nd-life/" target="_blank" rel="noopener">Nirmala Pariyar's 2nd life</a>, Ramu Sapkota <figure><img width="1200" height="1500" src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a36139c7e80680e0482e8jpeg.jpg" alt=""><figcaption> </figcaption></figure>Modern skyscrapers in earthquake-prone places like Tokyo use base isolation to counter seismic movement. The Nyatapola Temple in Bhaktapur, Nepal’s tallest, has similarly stood the test of time and two massive earthquakes by combining base isolation with triangulation. The ziggurat form that supports the five-storey <a href="https://archive.nepalitimes.com/article/nation/community-forest-comes-in-handy-earthquake-reconstruction,2927" target="_blank" rel="noopener">timber</a> and brick tower is essentially a robust plinth, separating the sacred relic and its towering housing from the shaking, while providing ample seating for the beautiful carved guardians of the venerated god.Read also: <a style="font-weight: bold; letter-spacing: 0.01em; background-color: #ffffff; font-size: 15px;" href="https://www.nepalitimes.com/opinion/nepal-is-being-loved-to-death/" target="_blank" rel="noopener">Nepal is being loved to death</a>, Anil ChitrakarBut just as important as <a href="https://www.nepalitimes.com/opinion/reconstruction-and-resilience-2/" target="_blank" rel="noopener">building resilience</a> into a structure is caring for it. In the past, buildings lived and breathed within settlements, cared for on a daily basis, and would fall apart if neglected. Ritual care, for example yearly renovations for Dasain, ensure that homes and community buildings are regularly maintained and kept intact, and thus less prone to falling apart in the event of a natural disaster.In the old towns of the Kathmandu Valley, <a href="http://archive.nepalitimes.com/article/nation/Monumental-loss,2215" target="_blank" rel="noopener">Newari dwellings and temples</a> were built with both tensile and rigid elements — timber, bricks and clay clustered together in courtyard configuration, each courtyard effectively creating braced squares that are more capable of withstanding shakes.  <figure><img width="1500" height="1500" src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221108111156/636a36169c7e80680e0482e9jpeg.jpg" alt=""><figcaption> </figcaption></figure>Similarly, communities in the high <a style="background-color: #ffffff; letter-spacing: 0.01em;" href="https://www.nepalitimes.com/banner/a-terrifying-assessment-of-himalayan-melting/" target="_blank" rel="noopener">Himalaya</a> build settlements one atop another into a hillside, or side by side on contours in maze-like configuration. These buildings, rising from the ground as an agglomerated system of dwellings, are a breathtaking symbol of communities leaning on one another, in a telling, enduring tradition of deep-rooted resilience. Building ResilienceFlexibility/shock absorbency (timber, steel, pinned joints, hydraulicised mud mortars)Rigidity/integrity/banding/corner reinforcements/buttresses (thick masonry walls, rammed earth, interlocking blocks, corner reinforcements, symmetry, opening sizes + locations)Base isolation (dampers, deep foundations, robust plinths)Bracing/triangulation/shear walls/lateral loading/banding (struts, capitals, corbels, lintels, top plates, reinforced concrete or timber banding, metal ties, plywood bracing wall panels)Lightweight Roofs (metal sheet, thatch, shingles, bituminous tiles)

Nepal’s traditional seismic resistant designs

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