Roundwood Houses: A Sustainable and Ancient Building Method
Roundwood houses, also known as timber roundhouses or cob houses, are a traditional and sustainable building method that has gained renewed interest in recent years. This ancient technique involves using round timber logs to create sturdy, circular structures, often with cob (a mixture of earth, sand, and straw) for infill and plasters. Let's delve into the world of roundwood houses, exploring their history, construction process, benefits, and modern applications.
History and Origins of Roundwood Houses
Roundwood houses have been built for thousands of years, with evidence of their construction dating back to Neolithic times. These circular dwellings were popular among various ancient cultures, including the Celts, Vikings, and Native Americans. The technique was used extensively in Europe during the Middle Ages and continued to be employed in rural areas until the 19th century. Today, roundwood houses are experiencing a resurgence as people seek sustainable, low-impact building solutions.
Construction Process of Roundwood Houses
The construction of a roundwood house begins with selecting the right timber. Traditionally, oak was the preferred choice due to its strength and durability, but other species like chestnut, ash, and larch can also be used. The logs are felled, debarked, and hewn into round timbers, which are then notched at the ends to create interlocking joints. The house is built up from the base, with each course of logs overlapping the previous one, creating a strong, stable structure.
Foundations and Base
The foundation of a roundwood house typically consists of a stone or concrete ring beam, which provides support and prevents the base logs from rotting. The first course of logs is laid on this ring beam, and the walls are built up from there.
Walls and Roof
The walls of a roundwood house can be left exposed, with the timbers visible on the interior and exterior, or they can be clad with a variety of materials, such as cob, stone, or render. The roof is usually a cone-shaped thatch or shingle structure, which allows rainwater to run off easily. Some modern roundwood houses feature flat or pitched roofs made from more contemporary materials.
Infill and Plasters
Once the walls are up, the spaces between the logs are filled with cob, which provides insulation and creates a smooth, finished surface. Cob is also used to create internal walls and partitions. Other materials, such as lime or clay plasters, can be applied to the cob to provide additional protection and finish.
Benefits of Roundwood Houses
Roundwood houses offer a range of benefits, both environmental and practical. Here are some of the key advantages of this building method:
- Sustainability: Roundwood houses use locally sourced, renewable materials, reducing their carbon footprint compared to conventional buildings.
- Strength and Durability: The interlocking joint system and the use of sturdy timbers make roundwood houses robust and long-lasting.
- Thermal Mass: Cob has excellent thermal mass properties, meaning it can absorb and release heat slowly, providing natural temperature regulation.
- Low Cost: Roundwood houses can be cheaper to build than traditional timber-framed or brick houses, as the materials are often locally sourced and labor costs can be lower.
- Quick Construction: The construction process for a roundwood house can be relatively quick, with some structures being completed in just a few weeks.
Modern Applications of Roundwood Houses
Today, roundwood houses are being built by individuals, communities, and organizations around the world, demonstrating their versatility and relevance in the 21st century. Some modern applications include:
- Homes: People are choosing to build roundwood houses as their primary residences, attracted by their sustainability, low cost, and aesthetic appeal.
- Educational Buildings: Schools and universities are incorporating roundwood houses into their campuses to teach students about sustainable building practices and traditional crafts.
- Community Spaces: Roundwood houses are being used to create communal spaces, such as meeting rooms, workshops, and event venues, in intentional communities and eco-villages.
- Emergency Housing: Roundwood houses can be constructed quickly and cheaply, making them an ideal solution for emergency housing in disaster situations.
Case Studies: Successful Roundwood House Projects
To illustrate the versatility and potential of roundwood houses, let's explore a few successful projects from around the world:
| Project | Location | Description |
|---|---|---|
| Humblebrag House | United Kingdom | A family home built using locally sourced timber and cob, featuring a thatched roof and a beautiful, curved interior. |
| Earthship Biotecture | New Mexico, USA | A global organization that builds roundwood houses (known as Earthships) using recycled materials and sustainable design principles. |
| Cob Cottage Company | Victoria, Australia | A social enterprise that builds affordable, sustainable roundwood houses for low-income families and communities. |
These case studies demonstrate the wide range of applications and designs possible with roundwood houses, from family homes to community spaces and emergency housing.
In the ever-evolving landscape of sustainable building, roundwood houses offer a compelling combination of ancient wisdom and modern relevance. By embracing this traditional technique, we can create durable, affordable, and eco-friendly structures that meet the needs of today's world while honoring the wisdom of our ancestors. As interest in roundwood houses continues to grow, we can look forward to a future filled with circular, sustainable dwellings that enrich our lives and protect our planet.
