Rammed Earth Walls (Unstabilised)
Damp subsoil compacted in lifts within formwork to build a monolithic wall. Massive, vapour-open, and finished as struck — the stratified lifts are the finish.
Carbon and evidence
How This Is Made
An Environmental Product Declaration is issued by a manufacturer against a declared unit. This record has neither, so it states sourced facts about process and provenance instead of a carbon figure.
Pisé de terre; a documented UK tradition and an active contemporary practice
Process
Feedstock
Earth
Subsoil with a suitable clay-to-aggregate grading, ideally won on site or within a short haul
Process heat
No heat
Binder
Clay
Fabrication
Site-formed
Sourcing: site-won to local
Who Builds It
Specialist trade
Rare in the UK
Formwork quality and compaction in consistent lifts govern the result far more than the mix
End Of Life
Compostable
Unstabilised earth returns to subsoil. Cement-stabilised earth does not — it becomes a demolition waste stream.
Maintenance: Eroded faces repaired with fresh earth; finished vapour-open or left as struck
Specification Risk
What a specifier has to resolve before this can be built.
- Certification
- No BBA or Agrément certificate; specified by test and precedent with engineer sign-off
- Fire
- Non-combustible mass, but no Euroclass classification is held
- Warranty
- Contractor workmanship warranty only; no product warranty exists
- Insurance
- Warranty providers may require an engineered justification — raise it early
- Supply
- Very few UK contractors. The trade, not the soil, is the programme risk.
Read This Honestly
- •No EPD exists or can exist: there is no manufacturer and no declared unit.
- •This record is UNSTABILISED rammed earth. Cement-stabilised rammed earth is a different material — reported as "not much better than concrete" — and needs its own record with a declared cement percentage.
- •Thermal mass is not insulation. An earth wall alone will not meet current UK fabric requirements.
Design & Specification Notes
Damp subsoil compacted in lifts within formwork to build a monolithic wall.
Material Note
Subsoil compacted in formwork, so the wall itself carries almost no process energy. What governs the answer is whether the soil is site-won and whether cement is added — a stabilised wall is a different material, and is reported to sit close to concrete.
Typical Uses
- •Primary frame
- •Long-span elements
- •Load-bearing supports
Key Performance
High load-bearing capacity for primary frame.
Specification Actions
- •Establish whether the soil is site-won; hauled subsoil removes most of the benefit.
- •Confirm whether the wall is stabilised, and at what percentage — this decides the carbon answer, not the earth.
- •Specify no cement render and no sealant — the wall must stay vapour-open.
Indicative Health & Indoor Air
Natural material with excellent indoor air quality. Stabilisers (cement/lime) are inert once cured.
Products in this category
6 products from 5 manufacturers · 25 in this category. Ordered by the evidence each record holds, never by commercial standing.
Specification
- Finish
- Rammed earth, formwork-cast
- Service life
- 100 years