{"id":3744,"date":"2016-05-06T16:50:51","date_gmt":"2016-05-06T11:20:51","guid":{"rendered":"https:\/\/mathskart.com\/?p=3744"},"modified":"2023-04-05T11:10:28","modified_gmt":"2023-04-05T05:40:28","slug":"building-an-earthen-roof-over-a-cob-home","status":"publish","type":"post","link":"https:\/\/thannal.com\/?p=3744","title":{"rendered":"Building an earthen roof over a cob home using Karingota leaves"},"content":{"rendered":"\t\t
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Speaking Natural Finishes \u2013 series 4<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Introduction<\/strong><\/p>

In the pursuit of creating something new, we often forget to sit back and reflect on ideas that have already been experimented on and tested over time. With this deep-rooted philosophy of studying and observing along with practising natural buildings, Biju Bhaskar travels harmoniously with the surroundings, seeking true natural buildings. And ever so often in his travels, he comes across hidden treasures of homes rich in the abundance of traditional knowledge. He is always accompanied by Sindhu Akka who with her nuanced observation & intuition can work magic with her hands. Along with kids Adhya & Bodhi, this little team is always out to explore natural, sustainable ways of building and living. One such natural building that Biju was keen on documenting was Devapriyan Kanjankat\u2019s home<\/a><\/strong><\/span>\u00a0in Kerala.<\/em><\/p>

Devan Mash, as Biju lovingly addresses him, had witnessed a number of old houses with flat mud floors being demolished. To his wonder, he found a layer of leaves beneath the layer of mud, which still looked like they had freshly fallen from the tree. With this consciousness, he was determined to go the traditional way and create a flat mud floor using Karingota<\/a><\/strong> (Niepa bark tree) leaves instead of the usual synthetic materials like tar and EPDM sheets used nowadays as vapour barriers in earthen floors.<\/em><\/p>

As a fellow natural builder, Biju Bhaskar had always wished to portray Devan Mash for this laudable attempt that very few architects would dare to make. \u00a0A true, fearless natural builder, Devan Mash is probably the first architect to take up the risk of experimenting on this subject\u00a0 We hereby hope our documentation will help the rest of the natural building community to apply traditional knowledge in our practices without hesitation.<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Devan Mash and his experimental flat mud floor:<\/strong><\/p>

The mesmerising Kerelaesque backdrop gradually led us to the comfortable Cob home of Devapriyan Kanjankat. After doing our earlier article about\u00a0Traditional Flat earthen roof using Eeta leaves<\/strong><\/a>\u00a0<\/span>in Kavilpadinjaredathu Mana, a 100-year-old gem in Manarkard, we were all set to this documentation in contemporary cousin mud floor system, made using the similar traditional technique.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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The building industry with the so-called \u201cadvancement in technology\u201d, has led us to take the easy way out; the one which offers permanence. We readily opt for synthetic alternatives to solutions that have already been worked out and practised for centuries, which are now suddenly obsolete for the modern world. We do not completely trust our natural materials and in search of foolproof solutions, we are losing our valuable traditional knowledge. We are always concerned that termites, insects or something ominous may bring the house down. But this is the least of Devan Mash\u2019s worries, he\u2019s the happiest when a part of the building fails, or a treatment method isn\u2019t good enough to keep pests at bay, he loves to see how a building behaves. That is what keeps him going, he\u2019s always searching for better solutions to respond to the issues at hand.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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What is coming forth is not just about the magical floors, but the house as a whole entity, because we just cannot separate the mud floor from the building to talk about it. It goes without saying that this house has many experiments worth bringing into the spotlight, to be explored further.
This house is a blend of the ageless cob and a relatively new member of the earth construction family- Compressed mud block. You\u2019d generally expect the cob to be bulky, but not in this case. Just 24 cm thick, the sleek cob walls are gracefully adorned by tall windows at intervals, just wide enough so that the cob can take in many perforations while letting in ample light. Cob used here is stabilised with lime for better strength, as well as for termite resistance.<\/p>

The cob wall has small openings in the top and the bottom of the wall to facilitate good ventilation, for keeping the house cool.<\/p>

The 4\u201d thick Cob wall:<\/strong><\/p>

His perseverance and meticulous calculations made it possible for Devan Mash to design a 4\u201d thick cob wall. Placed internally; this wall is connected with buttresses to transfer the load of the floor above.<\/p>

The wall has an opening for accommodating the door; this breaks the wall into 2 parts. The walls end to create an opening where the buttresses are designed.
Overall span: 3.6 m\u00a0
Opening width: 0.9 m\u00a0\u00a0\u00a0
Buttresses dimensions: 12 cm X12 cm<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Compressed mud blocks are used in making the first floor walls. These blocks are a convenient alternative to cob and can be laid like your regular masonry. Using the same mix as cob, the CMB\u2019s are made on the construction site itself. The staircase and parapet walls are made with the same blocks placed on their 4-inch edge, put together with mud-lime mortar. The top part of the compressed earth block parapet wall is lined with a layer of baked brick.<\/p>

A porch was added later as an addition to the main building, and under it is the rainwater harvesting tank. The roof of this porch is the main coconut beam and reused wooden members as rafters. A wooden spacer goes through the tie and the rafter, a typical Kerala style roof detail.
Bamboos used for the porch roofing structure were treated with saline water and cow urine. This treatment was found to be resistant to some pests but not all. All wooden members are treated by coating them with cashew-shell oil.<\/p>

For the plaster mix, cow urine is added along with finely sieved mud, sand, rice husk and lime. You can get a better insight into the plaster used here in our\u00a0speaking natural finishes series<\/a><\/strong><\/span>.<\/strong><\/em><\/p>

Detail of Flat mud floor in the bedroom:<\/strong><\/p>

As explained in the sketch above, the structure is simply a system of rafters spaced at equal intervals on load bearing cob walls. Spanning length of 3.8 m, these coconut rafters rest on a wooden plank that runs along the entire length of the cob wall. The area of contact of the cob wall and the plank is lined with a thick layer of cashew-shell oil; also all members in contact with the cob are first coated generously with cashew shell oil. The rafters of the floor extend to support the sun shade which is independent of the wall. The members of the sun shade weren\u2019t nailed directly to the wall, but formed a perfect stable triangle which didn\u2019t need any connection to the wall. The boarding\u2019s are that of flattened bamboo boards available in sheets.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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The joints between the boardings are then covered with wooden reapers to seal them thoroughly. The layer that precedes the boardings is Karingota<\/em>\u00a0leaves (Samadera indica Gaertn), overlapped and closely packed leaving no gaps, these leaves act as the vapour barrier. A vapour barrier is a material that is used for damp proofing that resists the diffusion of moisture. There has been no scientific evidence to confirm the properties of Karingota leaves as a vapour barrier and the mystery still remains, but time has proven that these leaves work perfectly and have been used in numerous flat mud floors traditionally. The next layer is a 4\u2033 thick mud layer, compacted and levelled on top of the leaves. The same mix used for cob is also used for the floor. This is then finished with wooden boarding which is reused palette wood.<\/p>

In a room with a dimension 2.7 x 3.6 m, the C\/C distance between the Rafters was 30 cm.<\/p>

The dimensions of the members of the floors were,
Plank below the Rafters<\/strong>: 3 cm thick\u00a0
The span of the Rafters<\/strong>: 3.8 m
load bearing cob walls<\/strong>: 24 cm
Rafter<\/strong>\u00a0\u00a0 = 3 X 15 cm\u00a0
Bamboo Boarding<\/strong>\u00a0size\u00a0<\/strong>= 1.2 m X 2.4 m\u00a0
Thickness-<\/strong>\u00a019mm thick
Mud Layer<\/strong>\u00a0\u00a0 = 10cm Thick

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This compilation has inspired us to use and study more about the importance of leaves in natural buildings and we hope this inspires you as well to confidently embrace traditional knowledge in your practices. For creating something new, you have to look back and learn from the past to understand what worked best, for our ancestors had more insight as a result of their relentless trials and experiments. Devan Mash is a living example for us who perseveres to push the limits in natural materials, applying the knowledge of the past and his own experiences. Let our future generations have something worthwhile to look back at. If we collectively do not care enough now, we shall end up becoming a poor mimic of the globalised landscape and their steel cold buildings, without any considerations for our fragile environment. We are losing our zeal to experiment, with everything that comes in our platter ready-made and easy, with a recipe. We may perhaps get out of our comfort zones to explore because there is a whole wide world of materials out there waiting to be rediscovered.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Devapriyan Kanjankat is a teacher in\u00a0Laurie Baker Centre<\/a><\/strong>\u00a0and a member of Costford, and has worked closely with Laurie Baker. Here\u2019s extending our gratitude to Devan Mash for very generously sharing his invaluable experiences and knowledge with us.<\/em><\/p>

illustration:\u00a0 Musharaff\u00a0Hebballi &\u00a0Anushree\u00a0Tendolkar<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\n\t\t\t\t\t\t\tBiju Bhaskar, Musharaff Hebballi & Anushree\u00a0Tendolkar\t\t\t\t\t\t<\/h4>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
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This article is by Natural builders Biju Bhaskar, Musharaff Hebballi & Anushree\u00a0Tendolkar. This post is part of our Ageless village series,.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\tAll Posts\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Documentation about using Karingota leaves to do an earthen roof over a cob home – Re”searching” past and materials for better future.<\/p>\n","protected":false},"author":2,"featured_media":10693,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[63,105,1615,1619,1621],"tags":[],"class_list":["post-3744","post","type-post","status-publish","format-standard","hentry","category-ageless-village-homes","category-natural-finishes","category-recipe","category-roof","category-walls"],"yoast_head":"\nBuilding an earthen roof over a cob home<\/title>\n<meta name=\"description\" content=\"Documentation about using Karingota leaves to do an earthen roof over a cob home - Re"searching" past and materials for better future.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thannal.com\/?p=3744\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Building an earthen roof over a cob home using Karingota leaves\" \/>\n<meta property=\"og:description\" content=\"Documentation about using Karingota leaves to do an earthen roof over a cob home - 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