Slip Resistance Ratings Explained & Suitable Applications

The surfaces of glazed and unglazed porcelain vary in their resistance to slipping when exposed to different levels of moisture. This post will aim to assist you in the understanding of the different slip ratings that perplex our customers, as well as how the classifications correlate with your particular application.

Ramp Testing for (R) Ratings – DIN51130 & DIN51097

The most commonly understood method of testing the slip resistance of a tile is the ramp test which generates an R-Value ranging from R9 – R13. This method is used by all of European tile manufacturers meaning that slip resistance information will always be available for you.

DIN 51130

R9

R10

R11

R12

R13

Slip Angle

6-10 deg

10-19 deg

19-27 deg

27-35 deg

35 deg

Wet Slip Risk

High Risk

Moderate

Moderate

Low Risk

Low Risk

Suitable for

Dry Areas

Areas kept mostly dry

Can be occasionally wet

Commercial Wet areas

Very wet commercial areas

 

The above table summarises a German National Standard test method; DIN51130. This test is a shod foot test where an individual walks on a wet surface wearing cleated safety boots whilst being held by a harness. The angle of the ramp is adjusted and whilst doing so the degree at which the individual slips, generates an R-Value.

DIN 51097

Uses

A

Dry barefoot areas (domestic use, kitchen, living rooms, bathroom)

B

Pool surrounds & showers

C

Commercial pools, jacuzzi’s & gym showers

Tile ranges can also be subject to an additional layer of ramp testing - DIN 51097. This tests the tile in wet & barefoot conditions, similarly repeating the differentiation in angles. This secondary line of classification is based upon barefoot use, so should only be considered when the tiles are being used in swimming pools, wetrooms or any other place where no footwear would be worn.

The above table has been extracted from our Slabstone technical data sheet and illustrates the ratings definition of use. It is one of our go-to choices when it comes to an interior/exterior range. The Natural finish (Nat. Rectified) is classed as an R10 based on the DIN51130 ramp test; with the additional classification of Class A attributed to the barefoot DIN51097 ramp test. Using this information, we would be happy to see this on a domestic internal surface such as a Kitchen/Dining room. The range also possesses an ‘Anti Slip’ finish; this finish is classed as an R11 C, which means it would be ideal for an exterior domestic patio or even a swimming pool.

Pendulum Testing

The Pendulum CoF test is designed to replicate the motion of a slipping foot and the tiles response to that motion. The value generated is called the Pendulum Test Value (PTV). It’s a different way of testing the slip resistance; however, its values can be directly compared to the results of the two tests we’ve just gone through.

R-Value (Shod Foot)

PTV

R9

11-18

R10

18-34

R11

34-51

R12

51-70

R13

70+

ABC-Value (Bare Foot)

PTV

A

21-31

B

32-42

C

45+


 

What does all of this mean for your application?

All these statistics and methods may all seem unbelievably mundane and a tad confusing; however, they paint an important picture for us as suppliers to depict for you. It’s vital to understand that the different ratings and values are not black and white for domestic clients- they can be interpreted to suit your specific application or setting. The following applications would be specific to domestic renovations:

Setting #1 – Wetroom Floor Application

With the growing popularity of modern wetroom designs, it is necessary to select a suitable surface that will be safe to stand on with bare feet in wet & soapy conditions. We can collate the data from all three test values to generate the prime slip rating value that would be sufficient for a wetroom. We recommend a minimum R10 Btile to be applied in this environment. Our Portland Range meets this requirement.

 

Further points of consideration would be who is using this wetroom; are they being used by the less able, eldery or children? If this is the case then more stringent measures (R11 + above) should be taken to ensure safety in these conditions. Feel free to seek the advice of one our Sales Consultants to establish a suitable surface for this application.

Setting #2 – Indoor-to-Outdoor Continuation

The concept of having the same tile flowing from the Kitchen/Living space through to the exterior garden, appeals to many of our clients in the midst of a renovation. Many of our ranges now come with a natural finish (suitable for interior use) and an anti-slip finish (exterior use). Origini is a wonderful new concerete effect range with an interior finish (R10A) that has a matching anti-slip exterior tile (R11A+B).

 

The problem that arises with porcelain ‘anti slip’ finishes, is the added maintenance you can expect with a more textured surface and the fact they aren’t available in large format sizes. We love the look of the huge 800x800 – 1200x1200mm sizes indoors & outdoors; nevertheless, they often only come in an R10A slip rating which would be labelled as ‘slippery when wet’. This being the case, we would consider your situation; do you have children/elderly people frequenting your property or how likely are you to be outside when there are inclement weather conditions? These considerations would help you decide whether it is worth the compromise on slip resistance for aesthetic gain.

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