Quick answer for the bid: Specify outdoor tile by the manufacturer's DCOF test result and its intended-use classification under ANSI A326.3, not by a look or a guess. ANSI A137.1 recognizes a wet DCOF of 0.42 or higher (measured per A326.3) as the minimum for level interior spaces expected to be walked on when wet. That figure is not a pass mark for exterior or pool decks. A326.3 asks the manufacturer to state which use categories a tile suits, such as exterior wet. Pull that from the product's spec sheet and put it in writing.
This is the spec-and-submittal companion to our installation post, Outdoor porcelain tile installation on a Florida lanai. That post covers substrate, slope, thinset, and movement joints. This one covers picking and documenting a slip-resistant tile so the job holds up to a client, an HOA, or an inspector. For the homeowner version, send clients to DCOF and slip ratings explained.
What ANSI A326.3 actually measures
- Test. A326.3 measures wet dynamic coefficient of friction with a BOT-3000E-type tribometer, using a 0.05% sodium lauryl sulfate solution, in the lab or in the field.
- Scope. It covers hard surface flooring. A137.1 (ceramic tile) and A137.3 (gauged porcelain panels) refer to it.
- Use categories. The standard has manufacturers classify products by expected use. Categories include interior dry, interior wet, interior wet plus (such as surfaces exposed to oils or steady water), exterior wet, and oils/greases. The 0.42 figure applies to level interior wet use only.
- What it is not. DCOF is a lab or site friction measure. It does not guarantee no one slips. Contamination, slope, footwear, maintenance, and sealers all change real-world traction.
R-ratings vs DCOF on European porcelain
Much of the outdoor porcelain sold in Florida comes from Spain and Italy and is labeled with a DIN 51130 R-rating (ramp test, shod foot) and sometimes DIN 51097 A/B/C (barefoot). Those are different tests from A326.3, and you can't convert them to a DCOF number. R11 on a European label is a real catalog value. Treat it as a separate data point. If your client, architect, or AHJ requires a DCOF, get the manufacturer's A326.3 result and use category in writing before you order.
A Florida lanai and pool deck spec checklist
- Exposure. Is it covered, screened, or fully exposed? Any pool splash, sprinklers, or algae-prone shade? Write it on the bid.
- Barefoot or shod traffic. Pool decks are barefoot. Ask for DIN 51097 or the manufacturer's pool-surround guidance in addition to DCOF.
- Use classification. Confirm the tile is rated for exterior use, from its spec sheet, in A326.3 terms where possible.
- Surface finish. Choose structured, grip, or matte outdoor finishes. Do not use polished or lappato tile outdoors.
- Frost and absorption. Florida rarely freezes, but porcelain (≤0.5% water absorption per ANSI A137.1) holds up best to wet-dry cycles and staining.
- Thickness. For paver installs over gravel or pedestals, use 2 cm porcelain pavers, not 9–10 mm floor tile.
- Slope and drainage. Even a high-DCOF tile is slick if water ponds. See the slope section of our lanai installation post.
- Setting and joints. Use exterior-rated setting materials and follow TCNA EJ171 for movement joints. Grout and joint color also affect how clean the deck looks after wet season.
- Sealers and coatings. Any topical sealer can change DCOF. If a client wants one, retest or get the sealer maker's slip data.
- Documentation. Put the product name, finish, and the manufacturer's slip data in the submittal. Keep a labeled spare box for future repairs.
In-stock outdoor tile to start with
These are slip ratings as printed in the product names. For anything else, check each product's spec sheet before you bid.
- Sagano Blue 12x24 R11 Anti-Slip Porcelain: R11 per its listing
- Shellstone Beige R11 12x24 Stone Look Porcelain: R11 per its listing
- Slate Multicolor 12x24 Slate Look Porcelain: a textured slate look. Confirm the slip data on its spec sheet.
Browse the full range: porcelain patio tile, patio and outdoor tile, stone-look outdoor porcelain, wood-look outdoor porcelain, porcelain pavers, and pool tile for waterline work. Order a one-piece sample from the product page to show the client the texture under their feet.
How to handle a slip complaint before it happens
- Give the client the manufacturer's slip data and use category in writing, along with a maintenance note. Algae, sunscreen, and pollen films reduce traction, so tell them to clean with the cleaner the manufacturer recommends.
- Don't promise "non-slip." Say the tile was specified for the exterior wet use as documented by the manufacturer.
- If a commercial or HOA job needs proof, a third party can test DCOF in the field per A326.3 after install.
Frequently asked questions
What DCOF does a Florida pool deck need?
ANSI A326.3 does not set one exterior pass number. The 0.42 wet DCOF in ANSI A137.1 is for level interior wet areas. For pool decks, use tile the manufacturer classifies for exterior wet or barefoot-wet use, and check any local code or HOA requirement.
Is R11 the same as a DCOF of 0.42?
No. R11 comes from DIN 51130, a ramp test with shod feet. DCOF comes from ANSI A326.3, a tribometer test. They can't be converted to each other. Ask for both if the spec requires DCOF.
Can I use polished porcelain on a covered lanai?
Not recommended. Covered lanais still get wet from rain, wet feet, and humidity. Use a matte, structured, or grip outdoor finish.
Does sealing outdoor tile change slip resistance?
It can. Topical sealers change surface friction. Get the sealer maker's slip data or retest after application.
Where is the install side covered?
See our Pro post on outdoor porcelain installation on a Florida lanai for substrate, slope, thinset, and movement joints.
Talk to the Trade Pro desk
Bring your plans to a Tile Outlets of America showroom in Tampa, Fort Myers, or Sarasota, or call 1-844-TOA-TILE. Our Trade Pro team can pull current stock and help you match tile, setting materials, and trim on one ticket. Want to check color and texture before you commit? Order a one-piece sample from any product page.