Sustainable Slip Resistance

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Sustainable Slip Resistance is a particular floor friction testing method and selection criteria for use in choosing and sourcing slip-resistant flooring that maintains good tribological characteristics over its life cycle to minimize slip and fall accidents. Testing floors before and after they are in place on a property can assure a building owner that safe flooring has been chosen and installed for its intended use. This floor slip resistance testing method, developed by the McDonald's Restaurant chain and now specified by many other property owners (e.g. Westfield, Aldi, Toyota) assesses the effects of mild abrasion on wet slip resistance. This test identifies flooring that has a high propensity to lose its wet slip resistance.

Contents

Pendulum floor friction tester in action Pendulum+Swing.jpg
Pendulum floor friction tester in action

The Need for Sustainable Slip Resistance

The widely accepted principle of safety by design, as well as U.S. laws and building codes, require that flooring be slip-resistant over its life cycle — not just at the time of installation. Safety criteria based solely on static coefficient of friction, often used in the U.S. for assessing safety, are too often misleading where flooring gets wet or otherwise lubricated in use.

Over 150 safety criteria have been adopted in Germany and Australia for specific situations — swimming pool decks, commercial kitchens, restrooms, etc. These are based on a laboratory test device, the variable-angle ramp, that is not readily portable. The pendulum tester is a portable ASTM method, has been used successfully since at least 1971 for assessing pedestrian traction potential, and is a national standard for pedestrian traction in 48 nations on four continents. Abrasion of a flooring sample, tested with the pendulum before and after, is being used to assess “Sustainable Slip Resistance.” Some architects and property owners are now combining this pendulum-based test with situation-specific safety criteria to specify and verify safe flooring. If flooring is in an area where it can get wet or otherwise lubricated (airborne deep-fryer fat, automobile grease, etc.), it needs to be slip-resistant under such conditions.

The Americans with Disabilities Act (ADA) requires that flooring accessible to disabled persons be slip resistant — not just when the building is constructed, but throughout its lifetime. Typical building codes in the USA require that "Every existing building, structure, premises or portion thereof shall be maintained in conformity with the code regulations and Department approvals in effect at the time of such construction and occupancy ... Every existing building, structure, or portion thereof shall be maintained in a safe condition and good repair … all physical elements of every existing building, structure or portion thereof shall be maintained … by restorative means, in a condition as close as reasonably feasible to their originally required and approved state." [1]

If a building owner can be confident that his or her new flooring will sustain its slip resistance for a period of years this can protect a considerable investment in the flooring and prevent business interruptions as well as protect the safety of the pedestrian. The stakes are even higher for hotels and cruise ships, which are occupied virtually nonstop with guests who will not tolerate the noise involved in changing out hard flooring.

Sustainable Slip Resistance (SSR) testing was developed by Strautins [2] [3] in Australia for McDonald's Restaurants to identify flooring that is not highly susceptible to loss of its slip resistance from wear or some types of inappropriate maintenance. This test and appropriate selection criteria can help avoid investment in inappropriate flooring as well as prevent costly, life-altering accidents and increased healthcare costs. This article explains the method and how it can be used to improve flooring safety in the USA.

Test Methods and Safety Criteria

International test methods

Germany and Australia have for over 10 years had detailed flooring slip resistance standards based on some 150 specific situations — e.g. external walkways, swimming pool decks, swimming pool stairs, commercial kitchens, hospital operating rooms, etc. [4] [5] Many architects elsewhere in Europe have informally adopted them. The slip resistance ratings are based on humans walking an oily or wet flooring sample in standard footwear and/or bare feet on a laboratory variable-angle ramp the repeatability of which was extensively documented. [6] However, the test results apply only to flooring before it is installed. In some cases initially good wet slip resistance is gone after the building has been open for only a few weeks. The ramp test can't be used to assess safety of the flooring on site under the ambient conditions.

The United Kingdom has since 1971 had well-established slip resistance standards based on a portable test method, the pendulum. This test was developed for pedestrian traction by the U.S. National Bureau of Standards in the 1940s and further refined in the UK. [7] It was validated for pedestrian traction in 1971, together with its safety standards, in the UK over a period of 25 years by 3500 real-world public walking area tests and site accident records. [8] [9] The test is an ASTM standard (E 303), slightly modified for pedestrian traction.

SSR Test Procedure

The SSR test procedure consists of an initial wet pendulum test; abrasion, wet, for up to several thousand cycles with a standard (100x100 mm 3M green Scotchbrite) abrasive pad under a standard load of 1 kg at 50 cycles/min; and another wet pendulum test after abrasion. Both hard and soft rubber pendulum sliders (or “test feet”) might be used if the area is walked on in both hard-bottom footwear and bare feet or soft-soled footwear. The abrasion is conducted either manually or mechanically using a Gardco 12VFI linear washability and wear tester.

Typically, about 85 percent of the loss in slip resistance after 5000 cycles has already occurred after 500 cycles. [2] Depending on the flooring buyer's situation, the flooring might be considered to have Sustainable Slip Resistance for a level floor if (for example) the wet Pendulum Test Value (PTV) is 35 or higher after abrasion for 500 cycles. The 500-cycle result in the laboratory has been found by in situ pendulum tests to be roughly equivalent to 6–12 months of wear in customer areas at a busy McDonald's Restaurant. The 500-cycle specification was adopted by McDonald's in Australia in October 2006. Other major property owners such as Aldi, Toyota, Westfield and a major cruise ship company have adopted similar specifications. In the US, flooring with SSR is available in ceramic tile, natural stone, and resilient products. Abrasive-containing coatings, some transparent, are also available that have SSR.

In some cases, analogous to the variable-angle ramp test-related standards mentioned above, the SSR safety standards are situation-specific [10] [11] rather than “one size fits all.” Thus a minimum pre-abrasion wet PTV of 35 might be required for hotel or hospital bathroom floors; a minimum of 45 (hard rubber slider) for stair nosings that get wet in use; and 54 (hard slider) for commercial kitchens and steep outdoor ramps. If the flooring is to be sealed after installation, the laboratory tests should be conducted with the correct sealer applied. Cleanability tests with expected contaminants (local mud, coffee, red wine, ketchup, etc.) by owners and/or other duty holders are also advisable before final selection of flooring. The methods of cleaning [12] should be planned. (A dirty mop with dirty water might not be adequate for slip resistant flooring, but abrasive pads can destroy wet slip resistance quickly.)

Related Research Articles

<span class="mw-page-title-main">Floor</span> Walking surface of a room

A floor is the bottom surface of a room or vehicle. Floors vary from simple dirt in a cave to many layered surfaces made with modern technology. Floors may be stone, wood, bamboo, metal or any other material that can support the expected load.

<span class="mw-page-title-main">Motorcycle personal protective equipment</span> Protective clothing and helmets for motorcycle safety

To improve motorcycle safety, many countries mandate the wearing of personal protective equipment such as protective clothing and helmets. Protective clothing may include certain types of jackets, gloves, boots, and pants. Jackets meant for motorcyclists are typically made of leather or specialized man-made fabrics like cordura or Kevlar. These jackets typically include padding on the elbow, spine, and shoulder regions. This was once quite bulky, but modern technology and materials have made it unobtrusive. Gloves are generally made of leather or Kevlar and some include carbon fiber knuckle protection. Boots, especially those for sport riding, include reinforcement and plastic caps on the ankle and toe areas. Pants are usually leather, cordura, or Kevlar. Except for helmets, none of these items are required by law in any state in the USA, or in any part of the UK but are recommended by many of those who ride.

Flooring is the general term for a permanent covering of a floor, or for the work of installing such a floor covering. Floor covering is a term to generically describe any finish material applied over a floor structure to provide a walking surface. Both terms are used interchangeably but floor covering refers more to loose-laid materials.

<span class="mw-page-title-main">UL (safety organization)</span> Global safety certification company

The UL enterprise is a global safety science company headquartered in Northbrook, Illinois, composed of three organizations, UL Research Institutes, UL Standards & Engagement and UL Solutions.

<span class="mw-page-title-main">Steel-toe boot</span> Footwear reinforcement

A steel-toe boot is a durable boot or shoe that has a protective reinforcement in the toe which protects the foot from falling objects or compression. Safety shoes are effective in keeping the feet of industrial workers safe from sharp and heavy objects while working in factories.

<span class="mw-page-title-main">Motorcycle boot</span>

Motorcycle boots are associated with motorcycle riders and range from above ankle to below knee boots. They have an outside of a typical boot but a low heel to control the motorcycle. To improve motorcycle safety, motorcycle boots are generally made from a thick, heavy leather and may include energy absorbing and load spreading padding, metal, plastic and/or composite materials to protect the motorcycle rider's feet, ankles and legs in an accident. For use in wet weather, some boots have a waterproof membrane lining such as Gore-Tex or SympaTex.

<span class="mw-page-title-main">Laminate flooring</span> Type of manufactured floor covering

Laminate flooring is a multi-layer synthetic flooring product fused together with a lamination process. Laminate flooring simulates wood with a photographic appliqué layer under a clear protective layer. The inner core layer is usually composed of melamine resin and fiber board materials. There is a European Standard No. EN 13329:2000 specifying laminate floor covering requirements and testing methods.

Earthquake engineering is an interdisciplinary branch of engineering that designs and analyzes structures, such as buildings and bridges, with earthquakes in mind. Its overall goal is to make such structures more resistant to earthquakes. An earthquake engineer aims to construct structures that will not be damaged in minor shaking and will avoid serious damage or collapse in a major earthquake. A properly engineered structure does not necessarily have to be extremely strong or expensive. It has to be properly designed to withstand the seismic effects while sustaining an acceptable level of damage.

<span class="mw-page-title-main">Guard rail</span> Freestanding fixture meant to aid in pedestrian and vehicle safety

Guard, Guard rails, guardrails, railings or protective guarding, in general, are a boundary feature and may be a means to prevent or deter access to dangerous or off-limits areas while allowing light and visibility in a greater way than a fence. Common shapes are flat, rounded edge, and tubular in horizontal railings, whereas tetraform spear-headed or ball-finialled are most common in vertical railings around homes. Park and garden railings commonly in metalworking feature swirls, leaves, plate metal areas and/or motifs particularly on and beside gates.

<span class="mw-page-title-main">Underfloor heating</span> Form of central heating and cooling

Underfloor heating and cooling is a form of central heating and cooling that achieves indoor climate control for thermal comfort using hydronic or electrical heating elements embedded in a floor. Heating is achieved by conduction, radiation and convection. Use of underfloor heating dates back to the Neoglacial and Neolithic periods.

<span class="mw-page-title-main">Fire-retardant fabric</span> Flame retardant fabric

Fire-retardant fabrics are textiles that are more resistant to fire than others through chemical treatment of flame-retardant or manufactured fireproof fibers.

A sprung floor is a floor that absorbs shocks, giving it a softer feel. Such floors are considered the best kind for dance and indoor sports and physical education, and can enhance performance and greatly reduce injuries. Modern sprung floors are supported by foam backing or rubber feet, while traditional floors provide their spring through bending woven wooden battens.

A performance surface is a type of flooring with attributes suitable for dance or sport. The word performance in this context will refer to any means of displaying physical movement. This includes theatrical, athletic, and recreational forms of performance. However, these different disciplines all require specialized floors to accommodate their specific physicality. Performance surfaces are normally designed as a sprung floor with additional material or layers on top, to create a complete dance floor or sports floor. Dance performance surfaces are denoted by using a layer of Marley, a popular type of vinyl, on top of a sprung floor. Theatres often have a number of roll-out floors with different characteristics to satisfy the requirements of different forms of dance. In addition, athletic flooring has been found to require different and new technological mechanisms to enhance performance. Flooring for spaces like clubs or ballrooms also serves a different purpose and therefore utilizes different properties.

Green building on college campuses is the purposeful construction of buildings on college campuses that decreases resource usage in both the building process and also the future use of the building. The goal is to reduce CO2 emissions, energy use, and water use, while creating an atmosphere where students can be healthy and learn.

<span class="mw-page-title-main">Abrasion (mechanical)</span> Process of wearing down a surface

Abrasion is the process of scuffing, scratching, wearing down, marring, or rubbing away. It can be intentionally imposed in a controlled process using an abrasive. Abrasion can be an undesirable effect of exposure to normal use or exposure to the elements.

<span class="mw-page-title-main">Package testing</span>

Package testing or packaging testing involves the measurement of a characteristic or property involved with packaging. This includes packaging materials, packaging components, primary packages, shipping containers, and unit loads, as well as the associated processes.

Floor slip resistance testing is the science of measuring the coefficient of friction of flooring surfaces, either in a laboratory or on floors in situ. Slip resistance testing is usually desired by the building's owner or manager when there has been a report of a slip and fall accident, when there has been a report of a near accident, or (preferably) before the flooring is installed on the property. Flooring is tested using a tribometer to discover if there is a high propensity for slip and fall accidents on it, either dry and/or when wet with water or lubricated with other contaminants such as kitchen grease, hydraulic oil, etc. There have been numerous floor slip resistance testing tribometers and lab devices produced around the world to measure both the static (stationary) and dynamic coefficient of friction, but presently there are only a few that have been proven to be reliable for obtaining useful safety results and that have current official test methods. Static coefficient of friction (SCOF) testing has always been unreliable for assessing safety in the wet condition, so any reliable slip resistance test will be measuring the available slip resistance to someone who is moving (dynamic) across the floor, and therefore will be assessing dynamic coefficient of friction (DCOF). If an instrument has no official published test method, or has a withdrawn test method, then there is a problem with the instrument, often being poor precision.

The Martindale is a unit for quantifying the abrasion resistance of textiles, especially when used for upholstery.

References

  1. City of Los Angeles Building Code, 2008, Chapter 81, Section 8104, based on 2007 California Building Code and 2006 International Building Code
  2. 1 2 Strautins, C.J., “Sustainable Slip Resistance: An Opportunity for Innovation,” Qualicer 2008, Castellon, Spain
  3. Strautins, C.J., “Enhanced Test Method for Assessing Sustainable Slip Resistance,” International Conference on Slips, Trips and Falls 2007: from Research to Practice
  4. Sotter, G., STOP Slip and Fall Accidents!, 2000, 204 pp., amazon.com
  5. CTIOA (a), Ceramic Tile Institute of America, “Floor Safety Reports: No. 3, Endorsement of Improved Test Methods and Slip Prevention Standards for New Flooring,” ibid., 2001
  6. Jung, K. and Schenk, H., “Objectification and Accuracy of the Walking Method for Determining the Anti-Slip Properties of Floor Surfaces,” (in German) Zentralblatt for Industrial Medicine, Accident Prevention and Ergonomics, 39, No. 8, 1988, pp 221–228, Germany
  7. Giles, C., Saby, B, and Cardew, K., “Development and Performance of the Portable Skid-Resistance Tester,” 26 pp., Department of Scientific and Industrial Research Road Research Laboratory Technical Paper No. 66, Her Majesty’s Stationery Office, 1964, United Kingdom
  8. Greater London Council, GLC Bulletin No. 43, March 1971, London, United Kingdom, available in pdf form at SafetyDirectAmerica.com, “Testing and Instruments — Pendulum”
  9. Greater London Council, GLC Bulletin 145, February 1985, ibid
  10. Natspec Technotes guidance for consideration, “Slip Resistance Performance,” NTN Des 001, July 09, http://www.natspec.com.au/Technical/tndesign.asp, Australia
  11. Bowman, R., “Slip Resistance Testing: Zones of Uncertainty,” 24 pp., presented at Qualicer 2010, Castellon, Spain
  12. Tari, G., with contributions by Brassington, K., Tenaglia, A. Thorpe, S., and Engels, M., “SlipSTD Publicly Available Specification (SlipSTD PAS)”, Version 6, revised, July 2009.