Waterproofing under tiles (EN 14891)
EN 14891 covers liquid-applied waterproofing products used under ceramic tiles. The class code (for example CM O2P) is stated in the maker's declaration of performance, and several makers do not print it in their data sheets; the cell then says so. Crack bridging, tiling time and coats are compared as each data sheet publishes them.
Last reviewed:
How we compared
Products are grouped by the standard class they declare (for example EN 12004 C2TE S1). Each competitor figure is copied from that manufacturer's own public technical data sheet or official product page, linked in the column header with the date it was read. Figures are shown as published: test conditions, market versions and editions differ, so a number points to the data sheet; it does not prove equivalence. Where a data sheet is silent the cell says so, and nothing is estimated. EuroFix figures come from the EuroFix data sheets on this site. The guide contains no ratings, scores, rankings or verdicts.
Trademarks
All product names and brands are trademarks of their respective owners; EuroFix is not affiliated with or endorsed by any of them. Listing a product here does not mean it can replace another on site: check the data sheet, the declared class and the substrate before substituting.
Comparison matrix
Rows are product types grouped by declared class; each cell names the manufacturer's product and links to its data sheet. A dash means no product of that type was compared in this edition.
| Product type / declared class | EuroFix | Ceresit (Henkel) | Isomat | Kiilto | Ardex |
|---|---|---|---|---|---|
| Liquid-applied waterproofing under tiles |
Liquid-applied waterproofing under tiles
Figures as published
| Criterion | EuroFix EuroFix Waterproofing Compound | EuroFix EuroFix Pool Seal 2K | Ceresit (Henkel) Ceresit CL 51 EXPRESS 1-K Market: Global (English data sheet) Data sheet: CERESIT_CL51_TDS_03_2024 accessed: | Isomat ISOMAT AQUAMAT-ELASTIC Market: Greece / EU Data sheet: 30.09.2026 accessed: | Kiilto Kiilto KeraPro Market: Finland / Nordics Data sheet: official product page accessed: | Ardex ARDEX S 7 PLUS Market: United Kingdom Data sheet: 2026-03 accessed: |
|---|---|---|---|---|---|---|
| Standard / class | EN 14891 class letters not published | EN 14891 · CM O2P | EN 14891 class DMP, as stated in the data sheet | EN 14891 · CM O2P two-component, cement-based | Not stated in this data sheet | Not stated in this data sheet |
| Number of coats | 2 cross-applied | 2 | ≥ 2 | Not read automatically: see the data sheet | Not stated in this data sheet | Not stated in this data sheet |
| Layer thickness | Not published | Not published | ≥ 0.5 mm dry film, two coats | Not read automatically: see the data sheet | ≥ 0.5 mm dry film | ≥ 1.5 mm combined minimum, two coats |
| Coverage / consumption | ≈ 1–1.5 kg/m² for two coats | ≈ 3 kg/m² for two coats | ≥ 1.3 kg/m² total for two coats | Not read automatically: see the data sheet | Not stated in this data sheet | Not read automatically: see the data sheet |
| Recoat / between coats | 4–6 h | Not published | ≈ 1 h | Not stated in this data sheet | Not stated in this data sheet | ≈ 4 h (20 °C) usually |
| Ready for tiling | ≈ 24 h after the second coat | Not published | ≈ 2 h after the second coat | Not stated in this data sheet | ≈ 3 h total drying time | 4 h after the second coat |
| Crack bridging | bridges hairline cracks; no value published | Not published | ≥ 0.75 mm | ≥ 1.13 mm (+23 °C) | 0.75 mm crack-bridging category 2, at 1.0 kg/m² | Not stated in this data sheet |
| Pot life | Not published | Not published | Not stated in this data sheet | 60 min (+20 °C) | Not stated in this data sheet | Not stated in this data sheet |
| Application temperature | +5…+35 °C | Not published | +5…+30 °C | Not stated in this data sheet | +18…+25 °C | Not stated in this data sheet |
| Packaging | 5 / 10 L bucket | 25 kg + 8 kg powder + liquid set | Not stated in this data sheet | 25 kg + 10 kg component A (powder) + component B (liquid) | 5 l, 15 l | 15 kg bag |
| EuroFix marks and certifications | EN 14891 · CE · ISO 9001 | EN 14891 · CE | – | – | – | – |
Sources
- Ceresit (Henkel) — Ceresit CL 51 EXPRESS 1-K (CERESIT_CL51_TDS_03_2024; Global (English data sheet); accessed )
- Isomat — ISOMAT AQUAMAT-ELASTIC (30.09.2026; Greece / EU; accessed )
- Kiilto — Kiilto KeraPro (official product page; Finland / Nordics; accessed )
- Ardex — ARDEX S 7 PLUS (2026-03; United Kingdom; accessed )
Units are shown as published. Coverage in m²/L and in L/m² are reciprocal; kg/m² per mm of thickness scales with the layer.
Frequently asked questions
Which classes are compared in waterproofing?
Liquid-applied waterproofing under tiles. Each row lists the EuroFix product and the equivalent product types published by Ceresit (Henkel), Isomat, Kiilto, Ardex.
Where do the waterproofing figures come from?
From each manufacturer's own public data sheet or official product page, linked in the table header with the date it was read; the last review was 20 October 2026. EuroFix figures come from the EuroFix data sheets.