Rammed Earth Construction: What You Need to Know

rammed earth construction

Rammed earth is an ancient construction technique that resembles adobe or cob building. People in drier and hotter parts of the world used this design, and interest in this construction technique subsided in the 20th century after the dawn of reinforced concrete.

However, some still advocate for its use today, citing its aesthetics and perceived environmental benefits compared to modern construction techniques. Rammed earth structures are also made from local materials meaning they have little waste.

This article will discuss all you need to know about rammed earth construction.

Table of Contents

What Is Rammed Earth Construction?

Rammed earth construction refers to ramming damp soil made from aggregate, sand, silt, clay, and gravel, into a formwork. The mixture is then compressed into a solid, and when it is dry, the formwork is removed to reveal monolithic walls.

The formwork needs to be strong enough to withstand the forces of ramming the earth. They also need to be easy to assemble and disassemble.

This technology was standard in drier and hotter parts of the earth. To work with rammed earth, you need to understand the climate and location where you will build the structure. The technology works best in humid environments with moderate temperatures.

For cold climates, rammed earth walls require additional insulation, whereas, in areas experiencing high rainfall, the walls need extra protection from the rain.

Most rammed earth structures exist in a basic form of compressed soil, but recently, builders add 5%-10% cement to the mix to increase the strength and durability. The appearance of rammed earth walls depends on the aggregates used and their color and texture.

A Guide to Rammed Earth Construction

Below is a detailed guide on how rammed earth construction works.

Structure

Rammed earth is strong in compression and is considered suitable for load-bearing walls. One can introduce reinforcement similar to concrete to these walls, but it needs to be carefully done to reduce the difficulty of ramming around the bars or the risk of the walls cracking.

The first step is constructing the formwork. It is usually made from steel and covered with plywood to create an off-form finish as the rammed earth takes up the formwork's shape. The soil type determines the length of walls you can build in each setup.

Before setting up the formwork, you need to mark out where to build the walls, either on the slabs or concrete footings. It would be best to consider the overall aesthetics of the building and floor plan, and articulation joints between the walls.

The next step is preparing the mixture for the rammed earth. Primarily, there are two kinds of rammed earth: raw and stabilized. The raw mix is carefully mixed soil, while the stabilized mixture has some binder.

After mixing the rammed earth to correct moisture levels, it is placed in the formwork using a shovel and compacted using a pneumatic tamper until the mixture is compressed to half its original volume. This process is then repeated iteratively until the compacted earth fills the formwork. The compacted wall is left in the wall overnight for initial curing to occur before removing the formwork.

The formwork is then carefully removed to reveal the compressed earth wall. The contractor then repairs the minor imperfections, such as soil protruding through bolt holes.

Types of Formwork

Formwork is an integral part of rammed earth construction, and a well-structured formwork should withstand the entire ramming process. 

There are mainly two types of formwork; movable and static. Other types are steel, system, and hybrid formworks. 

Movable formwork 

Also known as horizontal formwork, movable formwork is popularly used in rammed-earth construction worldwide. The material is mainly plywood, which is light and easily maneuverable yet not too strong to deform the rammed earth wall. 

Assembly and disassembly of the formwork are done rapidly with the controlled fixings between the two sides. Finally, the system uses wedges to tighten and loosen the formwork to unveil the wall.

Static formwork

Static formwork in rammed earth construction is an ongoing process of assembling elements vertically to between 2-4m. Static formwork uses system-built formwork that can be hired or bought, saving on construction time needed to build the formwork from scratch. In addition, it is easier to access static formwork, making it quicker for contractors to build rammed earth walls.

Steel formwork

One must assess the weight and structure of steel formwork before placing the raw materials into the formwork. As the rammed wall is built a centimeter at a time, the steel formwork increases its pressure from one layer to another. 

System formwork

System formwork works as a movable formwork with accessible panels, deep steel ribs, and an epoxy-bonded structure that makes it maneuverable. Although it is possible to slip form, the heavy weight of the system formwork needs to be checked to prevent issues when removing the state from the rammed earth wall system. 

Hybrid formwork

Used mainly in Serbia and China, hybrid formwork uses vertical fixed sections to slip from sides to contain them. The ramming process happens quickly with the rammed materials, usually placed in long sections, becoming one single structure with zero joints.

Insulation

Rammed earth walls need to give thermal comfort, especially in areas with varying temperatures and humidity levels. These walls behave as heavy-weight masonry with a high thermal mass.

An important feature to consider during insulation is the wall's thermal mass, as it slows the movement of heat through the walls when the temperatures drop. It releases heat to the surrounding environment when the temperatures are high.

To enhance the thermal comfort of these walls, one needs to improve the airtightness and hygroscopic properties of the rammed earth. Insulating a rammed earth structure requires proper planning, as most builders prefer to leave the external face exposed for aesthetic reasons.

An obvious benefit of these structures is that they have a large thermal mass that helps store solar gains and buffer temperature changes. Insulation, therefore, needs to be done outside the structure since if it is done inside, a building loses all its thermal mass benefits. Insulating the wall from the outside also keeps the thermal mass within a controllable envelope. This increases the durability of the walls.

One way of providing this insulation is through plastering. You can also do it by adding the wall's thickness, but this changes the structural properties of the wall and increases overall construction costs.

The type and positioning of insulation also depend on the climatic conditions. It is worth noting that rammed earth is hygroscopic, and the walls can breathe to allow for evaporation. Therefore, the insulation finishes need to be vapor permeable to prevent moisture build-up within the assembly.

Durability 

Rammed earth is generally very durable, as this technology has been around for hundreds of years. However, to maintain the integrity of these structures, one needs to keep moisture protection. Exposure to moisture reversed cement stabilization allowing the clays to expand, thus lowering the overall strength.

Therefore, the walls need to be shielded from weather elements as much as possible. The structure needs to have raised foundations that lift the wall at least 9 inches above the ground. The roof also needs overhangs to shield the walls from rain.

The structure's setup should allow the water to drain and evaporate quickly. Rammed earth walls are more suited to warmer areas since they have fewer moisture-related problems.

Environmental Benefits of Rammed Earth

Rammed earth walls have numerous benefits that make them great for construction without compromising quality. Below are some of the environmental benefits of rammed earth walls.

1. Eco-friendly

They also have very low embodied energy, meaning only a small amount of energy is necessary to construct the walls. Any waste materials can then be recycled or reused on the construction site.

These walls also have no cavities or materials that harbor pests, thus considerably increasing their pest resistance.

2. Low green-house emissions

In principle, rammed earth walls are a low greenhouse emission product. The emissions are primarily from the transport and manufacture, but these walls have very low emissions if construction is done using on-site materials.

They also have no flammable components, which help lower their overall emissions. Modern engineered rammed earth structures have considerably higher emissions than their traditional counterparts, but they generally have lower than concrete walls.

3. Breathability

People choose rammed earth walls because they 'breathe' and offer a healthy indoor environment. They allow for air inflow and outflow, thus efficiently helping combat humidity and maintain a stable internal temperature over the seasons. The finished walls are also inert and non-toxic.

4. Energy efficient

When properly constructed, rammed earth walls are very energy efficient. The thermal mass of these walls slows down the passage of heat through them and then releases the heat to the surrounding environment when the temperatures go down.

These energy savings minimize the need for heating and cooling systems.

5. Soundproof

Rammed earth walls are soundproof due to their density. This makes them suitable for areas experiencing continual sound pollution. They do not produce harsh echoes, which are a characteristic of most conventional wall materials.

Building several interior walls using rammed earth and combining them with double-pane windows can help create a unique quiet environment unlike any other.

6. Low maintenance

Rammed earth walls are generally low maintenance, and once built and sealed, they can take 10 to 20 years before needing further attention. There is no need for plaster or paint finish, and you can leave the bare walls exposed, forming a beautiful feature.

However, if you choose other kinds of finishing, they can be applied directly to the rammed earth surface like other masonry walls.

How Much Does it Cost?

The overall costs of a rammed earth project depend on the project's site, design, fixtures and fittings, and project size. A rammed earth wall costs around $86 per square foot on average, according to Asiri Designs. The prices go up depending on the complexity of the wall. However, this does not include labor costs.

Most home builders using rammed earth keep the costs down by doing the work themselves. A rammed earth house can cost as much as a conventional house, as you will still need land to build on, permits, materials, appliances, and electric systems. However, they have money-saving features such as reduced energy consumption.

Pros of Rammed Earth

Below are the pros of rammed earth construction.

Low maintenance

Well-constructed rammed earth walls are low maintenance and, once built and adequately cured, can stay approximately 10-20 years without needing any repair. In addition, its beautiful texture doesn’t need to be painted, making it easy to maintain.  

Soundproof

The high density of rammed earth walls makes it soundproof. This characteristic is better suited for areas with a lot of noise pollution.

It is eco-friendly

Raw materials used to build rammed earth walls are non-toxic and reusable, so nothing goes to waste. In addition, these walls combine beautifully with the environment with their natural, earthy color, soil texture differentiation, and low greenhouse emission.

Allows for airflow

Rammed earth walls are quite breathable due to the easy inflow and outflow of air that provide a steady internal temperature while regulating humidity levels. 

Impenetrable to most pests

Rammed earth walls have no cavities where pests can access or reside in. Therefore, once efficiently cured, it becomes impenetrable to most problems.

Cons of Rammed Earth

Below are the cons of rammed earth construction.

Construction costs may increase

Although rammed earth construction can be economical, if you start sourcing raw materials and employing laborers, the cost will increase significantly, making the final amount more than building a conventional home. There is also an added cost of buying and installing insulation required for all rammed earth constructions.

Has no long-term insulation

Rammed earth has a high thermal mass, making it a relatively poor insulator. Therefore, when constructing rammed earth, especially in colder climates, insulation needs to be correctly installed to make the indoor environment temperature comfortable.

Curing rammed earth takes a long time

The compressed rammed earth wall may look complete once the formwork is removed. However, it must be cured for approximately a month before it can be utilized. Any contractors using rammed earth as their primary material should account for the duration of curing as it takes up most of the project’s time.

Changes are hard to make after a wall is built

Mistakes made during the raming process can be hard to notice and challenging to rectify, especially after the wall is built.

Tedious approval process

As a traditional construction method in the United States, getting approval from bankers and insurance may require following a tedious approval process.

Conclusion

As you can see, there is a lot to love about rammed earth walls. You can use them for both domestic and commercial buildings. They are versatile, and you can craft them to unique finishes that blend easily with other building materials.

They are also great for regulating humidity and temperature problems if the walls are left unclad. This is ideal for people with issues such as asthma.

These walls are among the few environmentally-friendly materials you can apply in construction, making your investment worth the expense. The usability of rammed earth construction depends on your location, but they are an easy way to build sustainable housing.

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We use G2Crowd to deploy digital advertising on sites supported by G2Crowd. Ads are based on both G2Crowd data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that G2Crowd has collected from you. We use the data that we provide to G2Crowd to better customize your digital advertising experience and present you with more relevant ads. G2Crowd Privacy Policy
NMPI Display
We use NMPI Display to deploy digital advertising on sites supported by NMPI Display. Ads are based on both NMPI Display data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that NMPI Display has collected from you. We use the data that we provide to NMPI Display to better customize your digital advertising experience and present you with more relevant ads. NMPI Display Privacy Policy
VK
We use VK to deploy digital advertising on sites supported by VK. Ads are based on both VK data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that VK has collected from you. We use the data that we provide to VK to better customize your digital advertising experience and present you with more relevant ads. VK Privacy Policy
Adobe Target
We use Adobe Target to test new features on our sites and customize your experience of these features. To do this, we collect behavioral data while you’re on our sites. This data may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, your IP address or device ID, your Autodesk ID, and others. You may experience a different version of our sites based on feature testing, or view personalized content based on your visitor attributes. Adobe Target Privacy Policy
Google Analytics (Advertising)
We use Google Analytics (Advertising) to deploy digital advertising on sites supported by Google Analytics (Advertising). Ads are based on both Google Analytics (Advertising) data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Google Analytics (Advertising) has collected from you. We use the data that we provide to Google Analytics (Advertising) to better customize your digital advertising experience and present you with more relevant ads. Google Analytics (Advertising) Privacy Policy
Trendkite
We use Trendkite to deploy digital advertising on sites supported by Trendkite. Ads are based on both Trendkite data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Trendkite has collected from you. We use the data that we provide to Trendkite to better customize your digital advertising experience and present you with more relevant ads. Trendkite Privacy Policy
Hotjar
We use Hotjar to deploy digital advertising on sites supported by Hotjar. Ads are based on both Hotjar data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Hotjar has collected from you. We use the data that we provide to Hotjar to better customize your digital advertising experience and present you with more relevant ads. Hotjar Privacy Policy
6 Sense
We use 6 Sense to deploy digital advertising on sites supported by 6 Sense. Ads are based on both 6 Sense data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that 6 Sense has collected from you. We use the data that we provide to 6 Sense to better customize your digital advertising experience and present you with more relevant ads. 6 Sense Privacy Policy
Terminus
We use Terminus to deploy digital advertising on sites supported by Terminus. Ads are based on both Terminus data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Terminus has collected from you. We use the data that we provide to Terminus to better customize your digital advertising experience and present you with more relevant ads. Terminus Privacy Policy
StackAdapt
We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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