Choosing marble for wet floors: slip and drainage

Marble for a wet floor cannot be chosen just by looking at a “polished” or “matt” label. The finish of the chosen stone, the conditions of use, slip behaviour measured with a suitable method and the installation details should be assessed together. A photograph or how it feels to the touch is no substitute for a document showing technical suitability.

Define the use scenario clearly

A home bathroom, a hotel shower and a communal area can have different patterns of use. The project brief should say how the floor will get wet, who will use it and how it will be cleaned. Check in the test scope whether use in shoes and barefoot use are treated as the same. Do not carry a test result straight over to a different scenario.

Ask which surface the report describes

A test document should state the material identity, the finish, the test conditions and the method. A test carried out on a polished sample of a stone does not automatically represent a surface with a different finish. A numerical result looking “good” is not enough; its relationship to the conditions the project requires should be interpreted by the technical team. This article does not define a single safe threshold for every project.

Falls and the path of the water are part of the design

See on the installation plan where water on the floor will go, the area around the drain and the joints. A neat-looking finish is not enough; ponding and differences in level must be addressed too. The BCA's guide to natural stone finishes (opens in a new tab) stresses falls and workmanship in wet areas. Local project requirements are decisive as well.

Smaller pieces mean more joints, not a guarantee

Mosaic or small formats can be considered for resolving the geometry around a drain. But do not count a large number of joints, on its own, as proof of slip safety. The stone, the grout, the finish, cleaning and the flooring system are considered together. Keep the visual advantage of a small format separate from its documented performance.

Do not forget handover and maintenance

The products for the first clean, any residues that may be left on the surface and the maintenance plan that follows should all be in writing. Besides checking the appearance after installation, the acceptance checks the project requires should be carried out. The user's maintenance routine should match the conditions the floor was designed for.

When assessing material from Mabella for a wet floor, share the use scenario and the test method required. If there is no document for the surface in question, complete the technical assessment rather than assuming suitability. Record clearly that the visual choice and the decision on safe use do not rest on the same document.