Polymeric FPO membrane for mechanically fastened and ballasted roof waterproofing Sarnafil® AT-25 (thickness 2,5 mm) is a multi-layer synthetic membrane based on flexible polyolefines (FPO) with an internal fabric and backing according to EN 13956. Sarnafil® AT-25 is a hot air weldable roof membrane formulated for direct exposure and designed for use in all global climatic conditions. - Resistant to UV exposure
- Resistant to permanent wind exposure
- Resistant to all common environmental influences
- Hot air weldable
- No open flame equipment required
- High dimensional stability from glass fleece inlay
- Resistant against impact load and hail
- Resistant to mechanical influences
- Resistant to root penetration
- Compatible with old bitumen
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Usage Waterproofing membrane for: - Mechanically fastened roofing systems
- Loose laid ballasted roofs with different ballast materials (e.g. gravel, concrete slabs)
- Green roofs (intensive, extensive)
- Utility roofs
- Inverted roofs
- Terraces with pedestrian traffic
Advantages - Resistant to UV exposure
- Resistant to permanent wind exposure
- Resistant to all common environmental influences
- Hot air weldable
- No open flame equipment required
- High dimensional stability from glass fleece inlay
- Resistant against impact load and hail
- Resistant to mechanical influences
- Resistant to root penetration
- Compatible with old bitumen
Packaging Sarnafil® AT-25 standard rolls are wrapped individually in a blue PE-foil. | Packing unit | Refer to price list | | Roll length | 10,00 m | | Roll width | 2,00 m | | Roll weight | 52,00 kg |
Refer to current price list for packaging variations. Colour | Surface | matt | | Colours | | | Top surface | window grey (~RAL 7040) | | Bottom surface | dark grey |
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Technical Information Resistance to Impact
| hard substrate | ≥ 4000 mm | | soft substrate | ≥ 4000 mm |
Hail Resistance
| rigid substrate | ≥ 34 m/s | | flexible substrate | ≥ 46 m/s |
Resistance to Static Load
| soft substrate | ≥ 20 kg | | rigid substrate | ≥ 20 kg |
Resistance to Root Penetration
Tensile Strength
| longitudinal (md)1) | ≥ 950 N/50 mm | | transversal (cmd)2) | ≥ 900 N/50 mm |
1) md = machine direction
2) cmd = cross machine direction Elongation
| longitudinal (md)1) | ≥ 18 % | | transversal (cmd)2) | ≥ 18 % |
1) md = machine direction
2) cmd = cross machine direction Tear Strength
| longitudinal (md)1) | ≥ 300 N | | transversal (cmd)2) | ≥ 300 N |
1) md = machine direction
2) cmd = cross machine direction Joint Peel Resistance
| failure mode: C, no failure of the joint | (EN 12316-2) |
Joint Shear Resistance
| ≥ 400 N/50 mm | (EN 12317-2) |
Dimensional Stability
| longitudinal (md)1) | ≤ |0,4| % | | transversal (cmd)2) | ≤ |0,2| % |
1) md = machine direction
2) cmd = cross machine direction Foldability at Low Temperature
Exposure to Bitumen
3) Sarnafil® AT is compatible to old bitumen Effect of Liquid Chemicals, Including Water
| Resistant to many chemicals. Contact Sika Technical Services for additional information. | (EN 1847) |
UV Exposure
| Pass (> 5000 h / grade 0) | (EN 1297) |
External Fire Performance
| BROOF (t4) < 20° (subject to system) | (EN 13501-5) |
Reaction to Fire
| Class E | (EN ISO 11925-2, classification to EN 13501-1) |
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Application Information Ambient Air Temperature -20 °C min. / +60 °C max. Substrate Temperature -30 °C min. / +60 °C max. |
The above design is only a sample of the options available, for reference purposes only. Our policy of continuous improvement may result in a change of specifications without notice. If any discrepencies might be between the data sheet values and standards, we reserve the rights to make technical changes. Our company will not be held responsible, as all or any of pictures, drawings, weights and dimensions details or other elements in this document are only indicative and must not be considered contractual. Contact our sales team for other specifications or custom made products.
Contact our sales team for other specifications or custom made products.
