# Why our ancestors built round houses – and why it still makes sense to build round structures today ### 2 Story Round House The oldest forms of indigenous shelter were often round in shape. (Think the Southwest USA Hogan, Mongolian Yurt, North American Teepee and the Greek Tenemos, among others.) Why did our ancestors choose to build round? Because the ovid shape -- eggs, earth, tree trunks, and stones -- is what they saw reflected in the surrounding natural environment. And, as usual, Mother Nature knows best. There is some nifty natural science that makes round buildings more comfortable, more energy-efficient and safer -- especially if you combine the ancient shape with modern materials! ### Round Houses Circles can be stacked and connected. The same benefits of safety, air and temperature flow apply to a stacked round structure. ### Navaho hut Why did our ancestors build round? Because the ovid shape- egg, earth, tree trunks, stones -- is what they saw reflected in the surrounding natural environment. ### 2 Story Round Home with Deck The walls around the interconnecting pieces can be infilled with many different materials. Like; strawbale, cordwood, cob, sealed envelope, ICF's, etc. ### 31' Diameter Mandala The open circle center can span diameters as small as 16' and as large as 60'. ### Kitchen in a Round Home The interior spaces of a round home follow the same patterns. ### Mandala Round Home It's possible to combine living areas around the center circle space. ### Round Yoga Center People report better sleep, calmer energy, greater harmony and more connection with nature when living or working in a round space. Maybe our ancestors were on to something! ### Round Home “Circular living provides a balance of looking inward and outward, looking out at the natural environment and surroundings but then coming in again to the self and the hearth.” ### Less materials used to build a round home Round buildings use less wall, floor and roof mate­ri­als to enclose the same square footage as a rec­tan­gu­lar struc­ture. 15 to 20% less mate­r­ial is used to cre­ate the same square foot build­ing com­pared to a rec­tan­gu­lar design! ### Air moves naturally in a round space Air and temperature move naturally in a round space.The ther­mal dynam­ics of open-at-the-top architecture round space uses no external energy to circulate temperature. ### Roof Trusses Meet at Wall Top Roof trusses meet in a center ring, producing inward and outward pressure which holds the roof in a state of compression. ### Structural Overview of a Round House There are dozens of interconnected points in a round home. These are sites where engineered components- like a center radial steel ring, engineered steel brackets, Seismic and hurricane ties, bolts and steel cables- connect the structural pieces and give the building a unique combination of flexibility and strength- qualities which causes them to be significantly safer in severe weather conditions like earthquakes, extreme winds and heavy snow­fall ### Modern Round Home Wind and tsunami waves move naturally around a round building rather than getting caught at (and potentially ripping off) corners. ### Round Home by Deltec The oldest forms of indigenous shelter were often round in shape. (Think the Southwest USA Hogan, Mongolian Yurt, North American Teepee and the Greek Tenemos, among others.) Why did our ancestors choose to build round?... ## from the article The oldest forms of indigenous shelter were often round in shape. (Think the Southwest USA Hogan, Mongolian Yurt, North American Teepee and the Greek Tenemos, among others.) Why did our ancestors choose to build round? Because the ovid shape — eggs, earth, tree trunks, and stones — is what they saw reflected in the surrounding natural environment. And, as usual, Mother Nature knows best. There is some nifty natural science that makes round buildings more comfortable, more energy-efficient and safer — especially if you combine the ancient shape with modern materials. Wind and tsunami waves move naturally around a round building rather than getting caught at (and potentially ripping off) corners. A rounded roof avoids ‘air-planing’- a situation where a strong wind lifts the roof structure up and off of the building. There are dozens of interconnected points in a round home. These are sites where builders can connect parts of the building together. In the olden days, the connecting materials were rope, vine and hides. Modern materials are engineered components- like a center radial steel ring, steel brackets, Seismic and hurricane ties, bolts and steel cables. These connect the structural pieces and give the building a unique combination of flexibility and strength- qualities which causes them to be significantly safer in severe weather conditions like earth quakes, extreme winds and heavy snow­fall. The roof structure incorporates a unique architectural design that has its origins in the mountain steppes of Central Asia. Roof trusses meet in a center ring, producing inward and outward pressure which holds the roof in a state of compression. In modern round buildings using the ancient Yurt design, 1-3 airplane grade steel cables circle the outer perimeter where the trusses meet the wall and hold the natural outward thrust. Because of this combination of a central compression ring at the top of the roof and the encircling cables where the roof meets the walls, long roof spans are possible without any internal support system (like beams or posts). The interconnected tension in the building goes all the way to the ground and uses gravity and compression to hold it together with incredible strength. The natural ther­mal dynam­ics of open-at-the-top architecture round space uses no external energy to circulate temperature. It works like this; heated air naturally rises till it reaches the insulated ceiling, it moves up the domed ceiling till it reaches the center skylight, which is cooler, the air reacts by dropping to the floor where it moves across to the walls and rises again till it meets the skylight and drops again. This action constantly circulates the air and temperatures in the home. Round buildings use less wall, floor and roof mate­ri­als to enclose the same square footage as a rec­tan­gu­lar struc­ture. 15 to 20% less mate­r­ial is used to cre­ate the same square foot build­ing com­pared to a rec­tan­gu­lar design! This means the possibility for a smaller eco-footprint and more living space for less cost. It also means less sur­face area in con­tact with adverse weather con­di­tions, which improves the over­all dura­bil­ity and energy effi­ciency of the home. The acoustics of round space can be out of this world. The curve soft­ens the sounds inside the build­ing mak­ing it the per­fect place for rest and reflec­tion or for social­iz­ing and lis­ten­ing to and play­ing music (…think long winter evenings of storytelling around the central fire….) The shape also pre­vents noise from pen­e­trat­ing in from the out­side. Sound waves dis­si­pate as they wrap around the build­ing, shield­ing the interior from loud out­side noise. Our ancestors also understood a round home quality that is less measurable than the intelligent use of energy, the clever space allocation and the powerful and natural movement of air and sound. David Raitt, yurt builder, describes it “Circular living provides a balance of looking inward and outward, looking out at the natural environment and surroundings but then coming in again to the self and the hearth.” You might call it curve appeal. A 21st century home built with modern materials can be a safe, energy efficient , healthy-living-by-design House of the Future that Comes from the Past!