Clayworks Rustic Clay Plaster

A ready-to-use interior plaster of unfired clays blended with minerals and natural pigments, supplied dry and mixed with water on site. Applied to internal walls and ceilings, it buffers humidity and can be reworked or returned to the ground at end of life. Covers the Rustic and Demi-Rustic finishes.

Manufacturer page

Carbon and evidence

Product Evidence

Evidence currently held for the Clayworks product record.

Clayworks

Recorded Carbon Result

0.0484kgCO₂e/kg

A1–A3 GWP-total per kg of dry packaged product. Per kg, not per m² — an area figure needs the coverage rate at the specified thickness. From an EPD that expired in November 2025.

Indicator: GWP-total

A1–A3 covers raw-material supply, transport to manufacture and manufacturing. It is product-stage information, not a whole-life result.

Historical result from an expired EPD. It is retained for transparency, but it must not be used for product comparison until a valid replacement is recorded.

Environmental Product Declaration

EPD expired

Coverage: Product family
Declared unit: 1 kg packaged product
Programme: EPD International AB (The International EPD® System)
Registration: S-P-02278
Standard: EN 15804:2012+A1:2013
Valid until: 2025-11-08 · expired
Verification: Third-party verified

This declaration expired on 8 November 2025 and is written to the superseded EN 15804+A1:2013. It was third-party verified when issued; because it has lapsed, the evidence level here is recorded as published-source rather than verified. Clayworks have not yet published a replacement for the interior plasters.

Read the EPDSource: PDF p. 9, "Results per 1 kg of Rustic or Demi-Rustic clay plaster" — GWP-total Tot.A1-A3 = 4.84E-02

Carbon profile

kgCO2e per 1 kg of packaged clay plaster · each bar starts at zero · local scale

A1-A3 product

0.0484

A4-A5 site*

0.0111

B use

not declared

—

C end of life

0.00287

D reuse / recycling

-0.0102

adds carbon stores or removes EPD scenario* reuse/recycling potential (D)

* EPD transport and installation scenario, not this project's. Not declared: use. Module D shows potential impacts or benefits from reuse, recovery or recycling after the product's assessed life. It is reported separately and never added to A-C. Do not compare bar lengths between materials. Each chart may use a different scale and declared unit.

Reported GWP Modules

Displayed as stored; modules are not added together here.

A1–A3

0.0484 kgCO₂e

per 1 kg of packaged clay plaster

A4*

0.00875 kgCO₂e

per 1 kg of packaged clay plaster

A5*

0.00235 kgCO₂e

per 1 kg of packaged clay plaster

C2

<0.001 kgCO₂e

per 1 kg of packaged clay plaster

C4

0.002 kgCO₂e

per 1 kg of packaged clay plaster

D

-0.0102 kgCO₂e

per 1 kg of packaged clay plaster

* A4/A5 are EPD scenarios, not project-specific results. Module D is outside the A–C system boundary and is not added to A–C. Module nomenclature follows BS EN 15978 / EN 15804. Declared values are suitable as inputs to a whole life carbon assessment under the RICS Professional Standard (2nd edition); this panel is not an assessment.

Upfront Carbon (A1–A5)*

0.0595 kgCO₂e per 1 kg of packaged clay plaster

A1–A3 0.0484 + A4 0.00875 + A5 0.00235 · GWP-total, as declared

* Includes the EPD’s A4/A5 scenario assumptions, not project-specific transport or installation. This is the aggregation the proposed Part Z applies upfront limits to. The A1–A3 figure includes declared biogenic storage of -0.00921 kgCO₂e; Part Z aggregates upfront carbon excluding sequestered carbon, which is the assessor's adjustment to make.

Service Life — the B4 Replacement Input

60 years · EPD reference service life

The declaration gives the building's life, not the plaster's: mortars under minor environmental load are expected to last the lifetime of the construction, taken as 60 years for common European buildings under ISO 15686-1.

≈1 installation over a 60-year building study period.

B4 (replacement) follows the building, not the product: an assessor multiplies replacement cycles by project quantities. This record supplies the service life and does not compute B4.

Sourced Product Claims

Unfired clay — no firing or cement in the productManufacturer declaredSource
No SVHC substances from the REACH candidate list declaredThird-party verifiedSource
EPD expired 8 November 2025 — no replacement publishedPublished sourceSource

Evidence Sources

Clayworks Clay Plasters EPD (S-P-02278)

EPD International AB

Coverage: Rustic, Demi-Rustic, Smooth Finish and Tonal clay plasters

Published source

Comparison Status

This result should be displayed for information only and not ranked against another product.

• The EPD is expired.
• The carbon result is not linked to an evidence source.
• The EPD is not linked to an evidence source.

Evidence Gaps

•The recorded EPD is expired and is retained as historical evidence only.

Design & Specification Notes

Qualitative notes for early design discussion. Not product-specific EPD evidence, and not a basis for numerical comparison.

A ready-to-use interior plaster of unfired clays blended with minerals and natural pigments, supplied dry and mixed with water on site.

Typical Uses

•Interior wall finish
•Feature surfaces
•General fit-out

Key Performance

Durable surface for daily wear.

Specification Actions

•Confirm the current EPD covers the selected product, finish and manufacturing route.
•Calculate transport distances for primary materials.
•Document material reuse or reclaimed content percentages.

Indicative Health & Indoor Air

low Risk

•dry powder dust when opening and mixing

The EPD states the product as supplied is a dry powder and a suitable mask must be worn when opening the packaging and mixing.

Evidence:Published source

Specification

Collection: Clayworks clay plasters
Finish: Rustic and Demi-Rustic unfired clay plaster
Service life: 60 years

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