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Structural   Insulated   Rammed   Earth

  • SIREWALL, is a structural sandwich wall system typically 18″ to 24″ thick
  • Local soils combined with 6-10% cement are compacted on either side of a hidden insulation core
  • Stabilized with compacted earth and rebar, with 4″ of rigid insulation hidden in the centre of the wall (rebar is used in seismic zones)


Impactful and eye-catching,  SIREWALLs are a complete wall system with the strength and beauty of sedimentary sandstone.

This distinctive, visceral connection to the earth is also the exterior and interior finish of a SIREWALL building – no sealants, siding or drywall required.

These high performance walls are constructed with a system backed by over 20 years of R&D, producing thermal mass and efficiency beyond any other wall system. This combination, along with the SIREWALL® System for quality control and soil blending, builds walls that exceed current standards for energy efficiency and compressive strength.

The SIREWALL System has been refined over the last twenty years by SIREWALL’s Earth Masons, working seamlessly with unique designs and modern finishes that have timeless appeal.

SIREWALL has been the global technological leader of insulated rammed earth since its invention in 1992 and was the only practitioner for the first thirteen years. SIREWALL has four patents on this specific technology that leads the way in thermal and structural excellence in this emerging industry.


The SIREWALL System starts with secured reusable forms that are filled with a mixture of damp earth. The soil blend, once compacted, creates structural rammed earth walls that will last several lifetimes without the need for maintenance.

SIREWALL Earth Masons use SIREWALL’s world leading soil blending technology to achieve the optimal blend for the project’s strength and texture requirements.  We can create almost any colour desired, and do have recommendations to achieve quality and economy on a project specific basis.

SIREWALL Base Admixture is used to limit efflorescence and for its hydrophobic properties.  The hidden core of insulation at the center of the wall is most typically (but not necessarily) polyisocyanurate foam.  Forming, delivery, and mixing are determined specific to the project.  Pneumatic and hand tampers are selected specific to the project.

Ongoing Research and Development


While most people are drawn to SIREWALL by its beauty, they may not realize that this inherent beauty is actually the result of over 20 years of investment in R&D. To improve functionality, the strength of Structual Insulated Rammed Earth needs to be so much higher than its uninsulated cousin, so we continually refine our standards to ensure superior strength and performance.

Our Standards are the highest, and we ensure SIREWALL Earth Masons, professionals who are the trained more than any other in the industry, meticulously follow them.


SIREWALL Inventions:


In 1992 we invented the technique of adding an insulative core to a regular rammed earth wall, we were granted 4 patents in 2005 and were the sole practitioners of this method for the first 13 years.


In 2008 we achieved our goal of being the first in the world to consistently create rammed earth with the high compression strengths required to be used as a structural building material.

SIREWALL remains the one and only rammed earth system capable of delivering these results.

Rammed earth is easy to do… but difficult to do well.

When powered by enthusiasm yet insufficient knowledge, rammed earth results can be “variable”.

Green Building enthusiasts inspired to break ground and build a rammed earth structure with the best of intentions may be missing key components to create healthy, energy efficient homes and buildings that will last for future generations.

Below is a comparison chart that illustrates how depth of experience can result in a more solid approach to rammed earth construction.

Rammed Earth

Stabilized Rammed Earth


Insulated Rammed Earth


Structural Insulated Rammed Earth

Compressive Strength

1mPa – 3mPa

145psi – 435psi

3mPa – 7mPa

435psi – 1,015psi

3mPa – 28mPa

435psi – 4,060psi

20mPa – 30mPa

2,900psi – 4,350psi

R-value (static) R6 R6 R12 – R25 R33 & UP
R-value (dynamic) R9 – R13.5 R9 – R13.5 R38 – R56 R50 – R74
Erosion Resistance A garden hose erodes this Garden hose resistant Widely variable 2,500psi pressure washer resistant
Quality Control Protocol Unlikely Possible Unlikely Yes
Risk of efflorescence Possible Possible Possible Unlikely
Curing Protocol No Possible Possible Yes
Air barrier detailing No No Possible Yes
Pre-build soil optimization No Unlikely Minimal Yes
Vapour drive barrier No No Unlikely Yes
Engineer and Building Permit friendly No Yes Unlikely Yes
Large project capability Possible Possible Unlikely Yes
Standards & Specifications No Yes Variable, Self -monitored Yes
Possible patent infrigement No Yes Yes No


  1. Rubble trench – 4 inch bed of drain rock
  2. Reinforced concrete footing – up to 6 feet wide
  3. Drain pipe
  4. 12 inch interior rammed earth wall, reinforced with steel rebar
  5. 4 inch foam insulation
  6. 8 inch Exterior rammed earth wall, reinforced with steel rebar
  7. EMT pipe to function as electrical conduit
  8. Wooden top plate, anchored to wall, ready for roof truss
  9. Interior floor
  10. Optional anti-graffiti coating


What’s not visible in the diagram?


…how the strength of a stabilized, insulated rammed earth wall can vary when constructed!

Depending on how a rammed earth wall is built, these factors can dramatically affect overall strength and durability:

  • Too much or little moisture – 40% difference, best to worst
  • Hand tamping or wrong tampers – 50% difference
  • Curing – 50% difference
  • Mixing – 75% difference
  • Pneumatic tamping or wrong tampers – 25% difference
  • Control of lift depth – 50% difference
  • Material management – 30% difference
  • Consistency of soils used – 25% difference

The SIREWALL System uses a proven series of protocols to consistently achieve the highest possible wall strength.




Everything you need to know about SIREWALL can be learned right here




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