Some A326.3 classes are declared by the maker, not by one lab cutoff
Maker-declared, on the Tile Council questions page, points at section 3.4 of ANSI A326.3. The maker declares the class from manufacturing parameters, internal quality checks, experience with similar surfaces, and the criteria in the standard. That duty covers the classes the page brackets as Interior Wet Plus, Exterior Wet, and Oils/Greases.
When a meter reading misleads
The same section also covers mosaic surfaces and floors whose three-dimensional pattern or profile makes the DCOF device give a misleading reading because of how the device is built. Interior Wet may be maker-declared as an option. It is not required to be.
The maker still writes an internal rule
Where the declaration is not based on a DCOF limit from this test, the maker defines the internal selection rule. Examples named in the quoted section include other test methods, internal reference surfaces, abrasive grain, and surface structure. For Interior Wet Plus, Exterior Wet, and Oils/Greases, the page says makers are not limited to DCOF criteria.
Source
Fetched 2026-10-11 from Tile Council DCOF questions. The sentences above follow that page. They are not a contractor promise.
Related notes
- Tile notes index
- ANSI A326.3-2021 sorts hard floors into five use classes
- A coating applied after the floor is made is limited to dry areas
- Shower photos
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