Thermafleece UltraWool Slab

A denser, higher-performance version of Thermafleece’s wool slab — British hill sheep’s wool bonded with recycled polyester at 31 kg/m³ against CosyWool’s 21, manufactured in Yorkshire. The extra density is specified where acoustic performance or a firmer friction fit matters, and it is supplied in 50, 70 and 90 mm rather than CosyWool’s thicker range. Handled without the fibre irritation associated with mineral wools, and able to absorb and release moisture without losing thermal performance.

Manufacturer page

Carbon and evidence

Product Evidence

Evidence currently held for the Thermafleece product record.

Thermafleece

Recorded Carbon Result

0.0461kgCO₂e/m² per R=1

A1–A3 GWP-total per m² at R = 1 m²K/W. Near zero because 1.33 kgCO2e of biogenic carbon in the wool offsets 1.36 kgCO2e of fossil emissions. The EPD declares that biogenic carbon returning at disposal (C4 = 1.38). Multiply by the installed R-value for a real layer.

Indicator: GWP-total

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

Environmental Product Declaration

EPD recorded

Coverage: Specific product
Declared unit: 1 m² at R = 1 m²K/W
Programme: EPD International AB (The International EPD® System)
Registration: S-P-04468
Standard: EN 15804:2012+A2:2019
Valid until: 2026-10-31
Verification: Third-party verified

One EPD covers CosyWool Roll, CosyWool Slab and UltraWool Slab; the figures here are the table for this product only. Validity expires 31 October 2026.

Read the EPDSource: PDF p. 11, "Results per m2 UltraWool slab with R = 1 m2K/W" — GWP-total Tot.A1-A3 = 4.61E-02

Carbon profile

kgCO2e per 1 m² of UltraWool slab at R = 1 m²K/W · each bar starts at zero · local scale

A1-A3 product

0.0461

A4-A5 site*

0.0095

B use

not declared

—

C end of life

1.38

D reuse / recycling

-1.94

End of life is the largest of the modules this EPD declares.

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

0.0461 kgCO₂e

per 1 m² of UltraWool slab at R = 1 m²K/W

A4*

0.0095 kgCO₂e

per 1 m² of UltraWool slab at R = 1 m²K/W

C2

<0.001 kgCO₂e

per 1 m² of UltraWool slab at R = 1 m²K/W

C3

0.00144 kgCO₂e

per 1 m² of UltraWool slab at R = 1 m²K/W

C4

1.38 kgCO₂e

per 1 m² of UltraWool slab at R = 1 m²K/W

D

-1.94 kgCO₂e

per 1 m² of UltraWool slab at R = 1 m²K/W

* 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.

Service Life — the B4 Replacement Input

60 years · basis not recorded

≈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

Made from British hill sheep's wool with recycled polyester binderManufacturer declaredSource
0.38 kg biogenic carbon per declared unitThird-party verifiedSource
VOC tested to EN 16516:2017; formaldehyde below 2.0 µg/m³ at 3 and 28 daysThird-party verifiedSource
Declaration expires 2026-10-31 — 86 days from 2026-08-06, with no published replacementThird-party verifiedSource
Marketed as "25% recycled polyester"; the declaration says 15% recycled + 10% virgin PETThird-party verifiedSource

1 claim is held in the staging record but not presented as product evidence because an exact public source has not yet been mapped.

Evidence Sources

Thermafleece CosyWool and UltraWool EPD (S-P-04468)

EPD International AB

Coverage: CosyWool Roll, CosyWool Slab, UltraWool Slab

Third-party verified

Comparison Status

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

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

Evidence Gaps

•1 sustainability claim is withheld because exact public evidence is not mapped.

Design & Specification Notes

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

A denser, higher-performance version of Thermafleece’s wool slab — British hill sheep’s wool bonded with recycled polyester at 31 kg/m³ against CosyWool’s 21, manufactured in Yorkshire.

Typical Uses

•Thermal envelope
•Roof/wall cavities
•Airtightness layers

Key Performance

Good thermal resistance with reduced heat loss.

Specification Actions

•Compare embodied carbon of insulation options (natural vs synthetic).
•Request blowing agent GWP values for foam insulation.
•Confirm the current EPD covers the selected product, finish and manufacturing route.

Indicative Health & Indoor Air

low Risk

No fibre irritation hazard of the kind associated with mineral wool; no respiratory PPE required for handling.

Evidence:Third-party verified

Specification

Collection: Thermafleece insulation
Finish: Sheep's wool and recycled polyester slab
Width: 390 and 590 mm
Density: 31 kg/m³
Service life: 60 years

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