Building with rammed earth is simple, pocket friendly, and sustainable. Contrary to popular belief, rammed earth construction is feasible in a wide range of climatic zones, including areas with a significant monsoon. A built rammed earth structure is a sight for sore eyes, it is a dense but breathable material which makes it great for thermal insulation. With the right processes and tools, a rammed earth structure can easily be implemented by anyone. Here are some basics about the natural material to help you get started.

Knowledge Partners: Gia Mantra Global Village

For a detailed analysis of Rammed Earth as a building material, watch my conversation with natural building expert Donald Sequeira here.

We also answered the FAQs on Rammed Earth recently. Find the Q&A session here.

In part two of 'Building with Rammed Earth', I speak to Donald Sequeira. Donald is an architect, natural builder, and the Director of Gia Mantra Global Village in Tiruvannamalai, Tamil Nadu, India. In this conversation, we take a deep dive into questions from students, practitioners and sustainability enthusiasts to clarify concerns regarding rammed earth as a building material. Through this Q&A session we touch upon various aspects including:

• The Building Process

• Strength of Material

• Potential of Construction

• Climate Feasibility, and

• Maintenance

Here are some interesting questions that we received over the course of the IG Live session:

1. Can a rammed earth structure be built in areas with heavy rain?

   A rammed earth structure can be built in any climatic zone including areas with heavy rainfall. The precaution to be taken is to ensure large overhangs are given to protect the wall from the rain. Additional surface treatments like waxing or plastering protect exterior walls for a longer period.

2. What is the ideal soil type for rammed earth?

   Yes. Rammed earth walls can be built out of most local soils but the clay content should not exceed 30%. If the clay content is higher, the soil can be mixed with other soil types or washed with water to dilute the clay concentration.

3. How are building services addressed?

   The electrical conduits and plumbing must be inserted while ramming. Prior planning is required. Otherwise, services can be added later but those surfaces may require plaster.

4. Are any surface treatments possible?

   Yes, rammed earth walls can be plastered, painted, and tiled over like any other wall. Clear treatments such as wall waxing are also possible.

5. Can river sand be added to the soil mix to reduce the clay content?

   Yes. However, river sand is not ideal because it is not a sustainable source. M-Sand is a good alternative to river sand and can be used as one of the mixture components.

6. Can a 4" rammed earth wall partition wall be created inside a RCC framed structure?

   A 4" rammed earth wall may not be possible since very little space is available for ramming. Furthermore, if the wall is planned beneath a pre-existing beam or a slab, it becomes harder to ram the top portions and close the gap. CSEB is a good alternative for built framed structures.

In this IG Live, I speak to Donald Sequeira. Donald is an architect, natural builder, and the Director of Gia Mantra Global Village in Tiruvannamalai, Tamil Nadu, India. In this first part of our conversation on 'Building with Rammed Earth', we understand the fundamentals. We understand the potential and constraints of rammed earth as a material and learn about preparing the material for construction. We speak about the material's strength and stability and understand construction concerns such as building height and services. We also discuss the durability and maintenance of rammed earth over its lifetime.

Here are some common myths about rammed earth debunked:

• A rammed earth structure can be built in all climatic regions.

  Rammed earth can be used for construction anywhere. It is a breathable but dense material that offers great heat exchange in tropical areas and thermal insulation in extremely hot or cold regions.

• A rammed earth building is durable and has a lifespan greater than concrete.

  Rammed earth structures also possess strength that is at least equal to the strength of concrete. They are extremely sustainable in the long run and require minimum maintenance.

• Rammed earth walls do not have to be very thick and there is no limit to room sizes.

  For a ground floor structure, only a 9" rammed earth wall is required which is equal to the thickness of a brick wall. As long as this criteria is met, it is possible to create spacious rooms of various sizes with rammed earth.

• There is no threat of insects or pests entering the house through the rammed earth walls.

  Once compressed, the rammed earth wall becomes extremely hard and dense. While the material is breathable, it is not not porous. The density does not allow for passages to be made by pests.

The feeling of being inside a rammed earth structure is indescribable. The structure changes with the weather to protect you. It has a quiet, special, womb-like quality - one instantly feels cocooned.

In this IG Live, we speak to Dr. Ajit Gokhale, the founder of Natural Solutions, India to discuss ‘Building Reed-bed system for Wastewater Management’.
Over our conversation, we get into details about the components of a Reed bed system, how the water purification is carried out, and the right methods of implementation. We also debunk common misconceptions about reed beds such as odor and maintenance requirements. Finally, we speak about the different types of flowering and fruiting plants that can be used for reed bed systems in Goa and along the Western Ghats.

Natural Solutions aims to spread environmental literacy and offers sustainable solutions for Urban as well as Rural Problems of water scarcity, Solid Waste Management, and wastewater treatment. Here are some key takeaways from our conversation.

Debunked myths about reed-bed systems

• A reed bed system does not smell if designed correctly. The simple precaution of introducing the inlet pipe at the bottom of the reed bed and not the top of the ensures that no foul smell is emanated.

• A reed bed does not have to be designed in a segregated area. It can very much designed as part of the landscape to be a walkable, usable space that can be accessed regularly.

• A reed bed can be used to effectively purify not just greywater but also black water and industrial wastewater when implemented correctly. It does not require significant additional maintenance.

Maintaining a reed-bed system

• A reed bed system typically consists of two parts - a sedimentation system (a septic tank/ an anaerobic digester/ Jalrakshak) and a filtration system (the reed bed itself). The entire system requires very little external care or maintenance.

• As with any common drainage or waste treatment system, the septic tank/ anaerobic digester/ Jalrakshak has to be cleaned occasionally.

• The reed bed itself does not require any maintenance. The plants can be trimmed for aesthetic value but it is not necessary. Trimming does not hamper the reed bed system as long as it is done as per a pruning schedule. Care has to be taken that the base of the plants are intact.

Benefits of a reed-bed system

• A reed bed system is a one-time investment with lifelong benefits. It is extremely low maintenance in the long run.

• Depending on the microclimate, the reed bed can purify every 1L of impure water to create 0.7 to 0.9L of filtered water that can be reused.

• The filtered water can be reused for irrigation & gardening, washing cars, and for flushing.

• The reed bed can be integrated as an accessible part of the landscape of the house with flowering and fruiting plants and trees that become home to local biodiversity.

Reed beds are sustainable, scalable, cost-effective ecologically engineered systems that can effectively purify wastewater. They are easy to maintain and can be designed into the landscape irrespective of the project size or typology.

The year of 2021, while challenging, also marked several truly special milestones for our practice. We completed our design-build project in Goa, House with Three Pavilions, our countryside house Navovado won a platinum certification from the Indian Green Building Council, we watched our design for a lovely Lake House take physical shape in the picturesque Western Ghats. As a studio, our team has grown and we have been able to share our knowledge in sustainability through a series of Instagram lives and magazine columns with a diverse range of industry experts. As we begin a new year with a clean slate, looking back at the milestones from the year past, our #topnine2021 ! Giving gratitude for all that has been and here's to a wonderful and prosperous 2022!⠀

We love creating spaces with an intention to reconnect with nature - spaces that allow ample daylight and maximise natural ventilation, that seamlessly transition from indoor to outdoor and facilitate outdoor living. All of these aspirations can be easily realised using 5 key strategies to connect the inside with the outside.

01. Build around site's existing features, elevations, topography and consider restoring habitats.

Try to retain the site in its natural state as much as possible by limiting building footprint and preserving the existing ecological patterns. Before building, take time to observe natural patterns such as sun and shade, rain and drain, dry and lush areas, etc.

Visit the link to learn more about taking a site positive approach.

02. Design for extensive verandahs and incorporate verandahs as transition spaces to take everyday activities outdoors

Design indoor spaces that are flanked by generous outdoor spaces in the form of verandahs and courtyards. You can read our blogpost about the benefits of incorporating verandahs here.

03. Create large openings that seamlessly connect the indoors with the outdoors

Introduce large openings in between these indoor and outdoor spaces which can be opened up to connect the two spaces to allow them to function as one space.

04. Frame views

The openings should be designed to frame views and focus on key natural elements on the site, such as an existing tree, water feature, rocky outcrop, and/ or the views offered by the site.

Find out more about framing views here.

05 Continue the same material from indoor to outdoor and play with finish and texture to create variance

We like to use the same material in the indoor and outdoor space, once again connecting them visually and making them appear as one continuous space. The finish can be slightly altered from space to space ranging from mirror polished to rough cut as seen in the photograph below.

Find our answers to frequently asked questions about using natural stone here.

In this IG Live, we speak to architect and photographer Sanjeet Wahi. In this conversation, we discuss the fundamentals of photography right from different styles of framing a view, to the soft skills an architecture photographer should have, and the 3 pillars of photography. We also discuss the techniques and the equipment any beginner can get started with and finally conclude with the tools and software that are useful for editing and post processing.

Sanjeet is the COO of GROUNDED, and the man responsible for the photographs of our projects Navovado and House with Three Pavilions on our website and Instagram page.

In this IG Live session, we speak to Monish Siripurapu, Founder of Ant Studio in Delhi, India. Studio Ant works at the intersection of art, nature, and technology. Through their research and development wing Coolant they have made strides in building sustainable innovations through their all natural air cooling products. In this conversation, we discuss the science and method behind building this cooling system. We understand the system of Evaporative Cooling and the opportunities it presents in different contexts. We also speak about the process of research behind building this product and explore the nuances of parametric design. Tune in to watch our entire conversation.

I recently conducted an IG Live on taking A Site Positive Approach. As a follow up to that, I conducted another video session to get into details and answer pertinent questions about Rainwater Harvesting. I discuss the elements that make up a RWH system, compare the differences between rural and urban water management systems, and introduce some of the various options available for harvesting water. I also speak about the Goan monsoon patterns and the site specific methods that are useful in tropical areas. As an example, I explain the simple but effective well system created at Navovado, our completed vacation house in Goa. I also explore natural water systems such as ponds and bioswales which we have physically implemented at our project The House with Three Pavilions in Goa.

In this IG Live, I delve into the factors involved in taking A Site Positive Approach. I speak about how design can contribute to the land it stands on as well as simple measures that can be taken to ensure the site is preserved and that resources are managed well during and after construction. Over the Live, I explain the importance of the water management systems at our houses in Goa, and the natural systems we have implemented such as a pond and bioswales. I also answer questions about site positivity in the rural and urban contexts, speak about the opportunities offered by certain materials and the feasibility of creating a positive impact. Tune in to watch the entire session.

To know more about taking a site positive approach, you can read our blogpost on the subject which looks at the strategies implemented at The House With Three Pavilions.