ANSI A326.3-2021 sorts hard floors into five use classes
The 2021 revision of ANSI A326.3 added a product-use classification. A hard-surface floor is placed in one or more of five classes: Interior, Dry; Interior, Wet; Interior, Wet Plus; Exterior, Wet; and Oils/Greases. The Tile Council questions page copies Table 1 rather than leaving the criteria off the public page.
What the copied table shows
Interior, Dry (ID) is at least 0.42 dry DCOF under section 10.1. Interior, Wet (IW) is at least 0.42 wet DCOF under section 9.1, or a maker-declared class. Interior, Wet Plus (IW+), Exterior, Wet (EW), and Oils/Greases (O/G) are maker-declared in that table. The asterisks point at the standard's own notes.
This note stops at the table
The page presents those five rows as the criteria. It does not turn the table into a room-by-room shopping list.
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 tile numbers split installation from the product spec
- Some A326.3 classes are declared by the maker, not by one lab cutoff
- Floor photos
Send photos if you want another person to look at the area. This note does not set a response time.