Sika Sarnafil AT-18
Single-ply flexible polyolefin (FPO) waterproofing membrane for flat and low-pitch roofs — mechanically fixed, adhered or ballasted. Halogen-free, recyclable, with long proven service life; used across warm-roof, green-roof and blue-roof build-ups.
Carbon and evidence
Product Evidence
Evidence currently held for the Sika Sarnafil product record.
Recorded Carbon Result
A1–A3 GWP-total per m² of 1.8 mm membrane, per the current EN 15804+A2 declaration. Replaces the 3.44 figure from the superseded +A1 declaration, which expired in June 2025 and was declared at 1.5 mm.
Indicator: GWP-total
Sarnafil® AT Environmental Product Declaration (EPD-SIK-20240388-CBA3-EN) · PDF p. 6, "RESULTS OF THE LCA – ENVIRONMENTAL IMPACT according to EN 15804+A2: 1 m² Sarnafil® AT-18"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 1.8 mm membrane
- Programme
- Institut Bauen und Umwelt e.V. (IBU)
- Registration
- EPD-SIK-20240388-CBA3-EN
- Standard
- EN 15804:2012+A2:2019
- Valid until
- 2030-01-20
- Verification
- Third-party verified
The declaration covers the SikaRoof® AT / Sarnafil® AT family in 1.5, 1.8, 2.0 and 2.5 mm and is declared at 1.8 mm — which is Sarnafil® AT-18 exactly, so this record needs no thickness scaling. Manufacturing data is from Sika Technology AG, 2023. The superseded +A1 declaration was described in this record as covering 1.5 mm AT-18, which was wrong: 1.5 mm is AT-15.
Carbon profile
kgCO2e per 1 m² membrane, 1.8 mm · each bar starts at zero · local scale
A1-A3 product
4.8
A4-A5 site*
1.38
B use
—
C end of life
5.62
D reuse / recycling
-2.25
End of life is the largest of the modules this EPD declares.
Reported GWP Modules
Displayed as stored; modules are not added together here.
A1–A3
4.8 kgCO₂e
per 1 m² membrane, 1.8 mm
A4*
0.13 kgCO₂e
per 1 m² membrane, 1.8 mm
A5*
1.25 kgCO₂e
per 1 m² membrane, 1.8 mm
C1
0 kgCO₂e
per 1 m² membrane, 1.8 mm
C2
0.013 kgCO₂e
per 1 m² membrane, 1.8 mm
C3
5.61 kgCO₂e
per 1 m² membrane, 1.8 mm
C4
0 kgCO₂e
per 1 m² membrane, 1.8 mm
D
-2.25 kgCO₂e
per 1 m² membrane, 1.8 mm
Upfront Carbon (A1–A5)*
6.18 kgCO₂e per 1 m² membrane, 1.8 mm
A1–A3 4.8 + A4 0.13 + A5 1.25 · GWP-total, as declared
Service Life — the B4 Replacement Input
50 years · EPD reference service life
The declaration tabulates 50 years and describes it as a minimum, citing a 2014 durability study that expects over 50 years where the application and maintenance recommendations are followed.
≈2 installations over a 60-year building study period.
Sourced Product Claims
- IBU third-party EPD to EN 15804+A2, valid to 2030-01-20Third-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
Institut Bauen und Umwelt e.V. (IBU) · PDF p. 6, LCA results for Sarnafil AT-18
Coverage: Product-specific declaration for 1.5 mm Sarnafil AT-18, expired on 16 June 2025; obtain the current EPD before launch.
Institut Bauen und Umwelt e.V. (IBU) · PDF p. 6, "RESULTS OF THE LCA – ENVIRONMENTAL IMPACT according to EN 15804+A2: 1 m² Sarnafil® AT-18"
Coverage: SikaRoof® AT / Sarnafil® AT in 1.5, 1.8, 2.0 and 2.5 mm; declared at 1.8 mm (AT-18)
Comparison Status
The record contains the basic metadata required for a controlled comparison. Products must still perform the same function and use compatible units, PCRs and lifecycle scope.
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.
Single-ply flexible polyolefin (FPO) waterproofing membrane for flat and low-pitch roofs — mechanically fixed, adhered or ballasted.
Typical Uses
- •Roof coverings
- •Waterproofing layer
- •Weather protection
Key Performance
High durability in wet exposure and wind uplift.
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
Halogen-free FPO membrane; inert in use.
Specification
- Range
- AT-18
- Collection
- Sarnafil AT
- Finish
- Single-ply FPO roof membrane
- Thickness
- 1.8mm
- Width
- 2000mm
- Fire rating
- BROOF(t4) system options
- Service life
- 50 years