TL;DR
Writing product specifications for anti-slip stair nosings requires calling out dimensions (projection, width, profile radius), slip resistance metrics (CoF, DCOF, PTV), visual contrast values (LRV), material type, installation method, and the governing code edition. Missing any of these attributes leads to RFIs, failed inspections, and liability exposure. This glossary covers every term you need.
This reference is for architects, specifiers, facility managers, and procurement professionals who write or review product specifications for anti-slip stair nosings. Whether you are drafting a CSI 3-part spec for a new commercial build or evaluating a manufacturer’s data sheet for a retrofit project, the goal is the same: specify the right product with enough precision that what shows up on site actually meets code, performs under real conditions, and protects people from falling.
The National Safety Council reports over one million stair-related accidents every year in the United States alone. In Australia, slips, trips, and falls contributed to roughly 32,000 serious workplace injury claims in 2023-24 according to Safe Work Australia. Incomplete specifications are a direct contributor to these numbers, because when a spec is vague, the contractor picks the cheapest option that sort of fits.
This glossary breaks down every attribute that belongs in a stair nosing specification, organized by category, with the code references and practical context that make each term actionable.
Browse FRP stair nosings to see real product dimensions and variants as you read through each term below.
Dimensional Specification Terms
Dimensions are where most specification errors start. An ambiguous call-out for “stair nosing” without width, projection, or radius data gives the supplier too much room to substitute. Every dimensional attribute below should appear in your spec with a specific value or acceptable range.
Nosing Projection (Overhang)
Nosing projection is the horizontal distance the nosing overhangs the riser below. This is the single most code-sensitive dimension in any stair nosing specification.
The IBC caps nosing projection at 1¼ inches (32 mm). The ADA and ANSI A117.1 allow up to 1½ inches (38 mm). When both apply, the stricter IBC limit governs. Canadian projects referencing the National Building Code (NBC) must work within a 25 mm projection cap with a maximum radius of 13 mm.
A nosing projection is required on stairways with solid risers where the tread depth is less than 11 inches (279 mm). If your tread depth meets or exceeds 11 inches, projection is not mandatory, though it is still good practice for slip protection.
Why it matters in your spec: Omitting the projection dimension means the installer decides. If they overshoot by even a quarter inch, you have a code violation and a tripping hazard.
Projection Uniformity
The greatest nosing projection in a flight of stairs cannot exceed the smallest by more than ⅜ inch (9.5 mm) between two stories, including the nosing at floor and landing levels. Both the IBC and IRC enforce this tolerance.
This is a detail that gets missed during retrofits, especially when existing nosings vary and new ones are installed on top. When writing product specifications for anti-slip stair nosings on retrofit projects, measure every step first. Our guide on measuring stairs for nosings covers this process in detail.
Nosing Width (Depth of Coverage)
Nosing width is the measurement from the leading edge back across the tread. This tells you how much of the tread surface the nosing strip covers. Width varies significantly by product type and intended application. FRP pultruded nosings, for example, range from 70 mm to 228 mm depending on the profile. Aluminum nosings tend to be narrower, typically in the 50 mm to 75 mm range.
Wider nosings provide more abrasive surface area and better visual presence but may not suit shallow treads. Always cross-reference nosing width against your actual tread depth to avoid coverage that extends too far back and creates an uneven walking surface.
Profile Radius
The radius of curvature at the leading edge of the tread cannot exceed ½ inch (13 mm) under ADA/ANSI A117.1 and most model building codes. The Canadian standard CAN/ASC-2.8 mirrors this at 13 mm.
Practitioners on construction forums report that sharp corners chip more easily regardless of material, so even where code would technically allow a more angular edge, most experienced builders default to a gentle radius. This is sound advice. A chipped nosing edge becomes a new tripping hazard.
Riser Undercut Angle
Where the riser meets the underside of the nosing, the angle must be no less than 60 degrees from the horizontal. Alternatively, the riser can be sloped. This prevents the toe-catch hazard that causes forward falls on stairs.
When writing product specifications for anti-slip stair nosings that mount on existing risers, confirm that the nosing profile doesn’t create an undercut below 60 degrees. Some surface-mount profiles with thick bases can violate this requirement on shallow risers.
Tread Depth
The IBC requires a minimum tread depth of 11 inches (279 mm) for commercial stairs. The NBC aligns at 254 mm for most occupancy types. Tread depth determines whether a nosing projection is mandatory and influences which nosing width will fit without overhanging the riser below.
Slip Resistance Terms
Slip resistance is the core functional purpose of an anti-slip stair nosing. Yet it is the area where specifications are most often vague. Writing “slip resistant” without a test method and minimum value is meaningless. Here are the metrics that belong in every spec.
Coefficient of Friction (CoF)
CoF measures the resistance between two surfaces. For stair nosings, it is tested between the nosing surface and a standardized test foot (usually rubber or leather). There are two types:
Static CoF is measured when the surfaces are stationary. OSHA recommends a minimum static CoF of 0.5 for walking surfaces (referenced in OSHA 1910.22). The ADA recommends 0.60 for walkways and 0.80 for ramps, though these are recommendations rather than enforceable thresholds.
Dynamic CoF is measured when the surfaces are in motion, which more closely simulates a foot striking a step. Dynamic testing is increasingly considered the more reliable predictor of real-world slip risk.
What to specify: Always call out which type of CoF you require (static, dynamic, or both), the test method (ASTM F2913 is common), and the minimum acceptable value. “Slip resistant” alone is not a specification.
Dynamic Coefficient of Friction (DCOF)
DCOF measured per ANSI A137.1 is the standard for wet-condition performance. The minimum acceptable wet DCOF under this standard is 0.42. For stair nosings on exterior stairs or in areas exposed to water, specifying DCOF rather than static CoF gives you a more honest picture of performance.
When writing product specifications for anti-slip stair nosings for outdoor or wet-area applications, DCOF should be the primary slip resistance metric. Static CoF tested in dry lab conditions tells you very little about how the nosing will perform in a Canadian winter.
Pendulum Test Value (PTV)
The Pendulum Test Value is used widely in the UK, Australia, and increasingly in Canada. A PTV of 36 or above is classified as low slip risk. For public stair nosings, the target is generally 36 to 40 or higher.
PTV testing uses a swinging pendulum with a rubber slider that contacts the surface, simulating a heel strike. It is a field-testable method, meaning you can verify performance after installation, not just in the lab.
R-Rating (DIN 51130)
The German ramp test standard DIN 51130 assigns an R-rating based on the angle at which a person begins to slip on an oil-coated ramp. Industry guidelines cite R10 as the minimum for indoor stairs and R11 for outdoor stairs. This standard is less common in North American specs but appears frequently on products sourced from European or Australian manufacturers.
Abrasive Grit Types
The slip resistance of most commercial stair nosings comes from embedded abrasive particles. The two primary types are:
Silicon carbide has a Mohs hardness of approximately 9.4, making it extremely wear-resistant. It is the industry standard for commercial-grade nosing grit and the material used in most FRP pultruded nosings.
Aluminum oxide is slightly softer but still highly effective, often used in aluminum nosings with epoxy-bonded grit inserts. Some products combine both materials.
Your spec should call out the abrasive type, the binder (typically epoxy resin), and the minimum coating thickness. For cast products, a silicon carbide coating of at least 1/32 inch is the benchmark cited in continuing-education literature on stair safety.
Wet vs. Dry Testing
This is the single most important distinction in slip resistance specification. A nosing that tests well dry but fails wet is useless on an exterior stair or in a commercial kitchen. Always require wet CoF or wet DCOF testing for any application where moisture is possible, which includes virtually every exterior installation in Canada.
For a deeper look at how stair nosings reduce slip incidents, see our article on nosings and injury reduction.
Visual Contrast and Accessibility Terms
Visual contrast is the specification attribute most often forgotten, and it is the one that fails inspections. Practitioners in the accessibility compliance space consistently flag this as the top reason stair nosing installations get rejected during final review.
Light Reflectance Value (LRV)
LRV measures how much light a surface reflects on a scale of 0 (pure black) to 100 (pure white). The widely accepted standard requires at least a 30-point LRV difference between the nosing and the surrounding stair tread. This ensures that someone with low vision can distinguish the stair edge.
For Canadian projects following CNIB or AODA guidance, the bar is significantly higher: a 70% luminance contrast is recommended. This is a much more demanding target and limits your color palette considerably.
Practical tip from specifiers: Consult LRV charts to select nosing and step colors that achieve the required difference. Request physical samples and evaluate them in the actual lighting conditions at the installation site. Colors that look distinct under office fluorescents can appear nearly identical under the dim lighting of a parking garage stairwell.
Contrast Strip Width and Placement
A visual contrast marking must be applied to the leading 1 to 2 inches (25 to 51 mm) of the tread or landing, measured horizontally from the nosing edge. The strip must extend the full width of the step. Either light-on-dark or dark-on-light schemes are acceptable.
When the nosing itself provides the contrasting color (as with a yellow-nosed FRP nosing on a dark tread), a separate contrast strip may not be needed, but confirm this with your local code authority.
Photoluminescent (Glow) Strips
Photoluminescent nosings or glow strips charge under ambient light and emit visible light when the power goes out, marking egress paths during emergencies. When specifying photoluminescent properties, the critical requirement is that the photoluminescent pigment be an integral part of the abrasive, not a separate applied strip that could delaminate. The glow portion should have the same coefficient of friction as the rest of the abrasive surface.
See glow-in-the-dark strip options for emergency egress marking.
Material Specification Terms
Material selection drives durability, slip resistance longevity, installation method, and cost. Writing product specifications for anti-slip stair nosings without specifying the material is like specifying a beam without calling out steel or wood. Here are the options and where each one fits.
FRP / GRP (Pultruded Fibre Reinforced Polymer)
Pultruded FRP nosings are lightweight, corrosion-proof, and can be cut to length on site with standard tools, which matters on retrofit projects where no two steps are the same width. The high-grit surface is integral to the nosing (not an applied coating that wears off), providing long-term slip resistance.
FRP resists freeze-thaw cycling, UV exposure, and chemical contact. This makes it the strongest choice for Canadian exterior stairs, industrial environments, and coastal installations where salt air accelerates corrosion. For guidance on cutting FRP on site, see our on-site cutting and finishing tips.
Extruded Aluminum
When paired with integrated abrasive grit inserts, extruded aluminum nosings provide consistent, measurable slip resistance with a clean commercial appearance. Properly specified aluminum resists corrosion and handles high foot traffic without deforming.
Practitioners on construction forums describe extruded aluminum as “the undisputed champion for 90% of commercial projects.” That assessment holds when the nosing includes abrasive filler strips rather than relying on the aluminum surface alone, which is slippery when wet.
Browse aluminum stair nosings to compare profiles and finishes.
For a detailed comparison of aluminum specification language in architectural plans, see our guide on specifying aluminum stair nosings.
Cast Aluminum and Cast Iron
Cast products are designed for new construction where the nosing is embedded in wet concrete. They are extremely durable and essentially permanent, but they cannot be retrofit to existing stairs. Cast iron is heavier and used in heavy-industrial or heritage applications.
Rubber and PVC
Rubber and PVC nosings are suitable for indoor applications: office buildings, schools, hospitals. They are quieter underfoot and gentler on falls. However, they degrade under UV exposure and lose flexibility in extreme cold. For any Canadian exterior application, or any location exposed to freezing temperatures, rubber and PVC are poor choices.
This is a critical specification note. A rubber trim that performs well in a residential basement will be destroyed within weeks in an outdoor industrial setting. Our article comparing FRP vs. rubber stair treads breaks down the performance gap in detail.
Abrasive Filler Composition
In aluminum nosings with grit inserts, the filler is typically aluminum oxide, silicon carbide, or a combination of both, bound in an epoxy-resin binder. Your specification should call out the filler type, binder, and minimum fill depth. Cheap fillers in weak binders wear smooth under heavy traffic within months.
Installation and Attachment Terms
How the nosing attaches to the stair determines whether the installation lasts five years or twenty-five. It also determines whether the nosing is suitable for new construction, retrofit, or both.
Cast-in-Place
Cast-in-place nosings are set into wet concrete during construction. They can be used on poured concrete stairs, concrete-filled steel pan stairs, and precast concrete stairs. The nosing profile includes an anchor (often a continuous extruded flange) that embeds in the concrete.
This method produces the most permanent installation but is only available during new construction or major renovation where concrete is being poured.
Surface-Mount (Retrofit)
Surface-mount nosings attach to existing finished stairs using mechanical fasteners, adhesive, or both. This is the method used for retrofit projects, which represent the majority of anti-slip stair nosing installations.
When writing product specifications for anti-slip stair nosings on retrofit projects, always specify the attachment method explicitly. “Adhesive and mechanical fasteners” is not the same as “adhesive alone,” and the choice depends on the substrate material, traffic load, and whether penetrations are acceptable.
Saddle Clamp Assemblies
For open-grate or bar grating stairs, standard surface-mount methods don’t work. Saddle clamp assemblies grip the grating bars without drilling, allowing nosing installation on industrial stairs with open treads. See stainless steel saddle clamp assemblies for this specific hardware.
Continuous Extruded Anchor
Used in cast-in-place installations, this is an integral flange running the full length of the nosing that embeds in concrete. It provides a continuous bond line rather than point fastening.
Pre-Drilled Countersunk Holes
For mechanical fastener attachment on surface-mount nosings. Pre-drilled holes ensure consistent fastener spacing and prevent field drilling errors that can crack the nosing or miss the substrate.
Codes, Standards, and Format Terms
Writing product specifications for anti-slip stair nosings means citing the right codes. An uncited spec is unenforceable. Here are the references that belong in your document.
CSI MasterFormat Section 05 55 00
Stair treads and nosings live in Section 05 55 00 of the CSI MasterFormat. This is where your specification is filed in the project manual. When communicating with contractors and suppliers, referencing this section number removes ambiguity about what you are specifying.
CSI 3-Part SectionFormat
A complete specification follows CSI SectionFormat with three parts:
Part 1, General: References, submittals, quality assurance, delivery and storage requirements, warranty.
Part 2, Products: Materials, manufacturers, fabrication details, finishes, performance criteria.
Part 3, Execution: Installation procedures, substrate examination, field quality control, cleaning, protection of installed work.
Most manufacturer spec templates follow this structure. If a manufacturer hands you a specification that doesn’t follow it, reformat it before inserting it into your project manual. Contractors expect this structure and will miss requirements buried in non-standard formats.
IBC (International Building Code)
The IBC governs commercial construction in the United States and heavily influences Canadian practice. Key stair nosing provisions include the 1¼ inch projection limit, the ⅜ inch uniformity tolerance, the 11-inch minimum tread depth trigger, and the profile radius requirements.
NBC (National Building Code of Canada)
The NBC is a model code developed by the Canadian Commission on Building and Fire Codes. It must be adopted by provincial or territorial authorities to become law. This means stair nosing requirements can vary by province. Always confirm which edition your province has adopted.
For a deeper look at Canadian accessibility code considerations, see our article on Canadian building code considerations for nosings.
ADA / ANSI A117.1
The ADA Standards (Section 504.4) require compliance with ground and floor surface provisions in Section 302, calling for surfaces to be “stable, firm, and slip resistant.” ANSI A117.1 provides the technical criteria for accessible design, including stair nosing geometry.
OSHA 1910.24
Section 1910.24(f) states that all treads shall be reasonably slip-resistant and the nosings shall be of non-slip finish. This applies to workplace stairs and is the standard most frequently cited in industrial facility specifications.
NFPA Life Safety Code
Section 7.1.6.4 requires that walking surfaces in the means of egress be slip-resistant under foreseeable conditions. “Foreseeable conditions” is the key phrase: for an exterior stair in Nova Scotia, that means wet, icy, and snow-covered conditions are all foreseeable.
ASTM F2913
This is the standard test method for measuring the coefficient of friction of a floor surface using a horizontal pull slipmeter. When requiring CoF testing in your specification, cite this standard so the manufacturer knows exactly which test to run.
ANSI A137.1
The standard that defines wet DCOF testing methodology and the 0.42 minimum threshold. Cite this when specifying dynamic coefficient of friction for wet-condition performance.
What a Complete Specification Includes
Here is the checklist. Every anti-slip stair nosing specification should address each of these attributes. If any line item is missing from your spec, you have a gap that a supplier or contractor will fill with their own judgment, which may not align with your project requirements.
- Material: FRP, extruded aluminum, cast aluminum, rubber, PVC, or other
- Nosing width (depth of coverage): In mm or inches
- Nosing length: Match to stair width, with cut-to-fit tolerance if applicable
- Projection distance: Within code limits for your jurisdiction
- Profile radius: Not exceeding 13 mm (½ inch)
- Riser undercut angle: 60 degrees minimum from horizontal
- Attachment method: Cast-in-place, surface-mount with fasteners, adhesive, or combination
- Slip resistance metric: CoF, DCOF, or PTV with test method and minimum value
- Abrasive type: Silicon carbide, aluminum oxide, or combination; binder type
- LRV contrast value: Minimum 30-point difference (or 70% for CNIB/AODA compliance)
- Contrast strip width: 25 to 51 mm at leading edge, full width
- Photoluminescent requirement: Yes or no; if yes, integral pigment required
- Color and finish: Specific color call-out, not “as selected”
- Governing code edition: IBC year, NBC year, provincial amendments
- Manufacturer test certificates required: CoF/DCOF test report, LRV data, UV weathering results, freeze-thaw test results
That last item, manufacturer test certificates, is the gap that no competitor’s specification guide addresses. You should require the manufacturer to provide third-party test data for every performance claim. If they cannot provide a CoF test certificate, their “slip resistant” claim is marketing, not engineering.
Limits of Anti-Slip Stair Nosings
Anti-slip stair nosings significantly reduce slip risk, but they do not eliminate it entirely. A few realities to keep in your specification notes:
- Nosings still need cleaning and maintenance. Grit surfaces clogged with oil, paint, or debris lose their slip resistance.
- Ice, snow, and standing water must still be managed through drainage, snow removal, and building maintenance programs.
- No single product solves every slip hazard. Nosings protect the stair edge. The rest of the tread, the landing, and the approach surface all need their own slip resistance strategy.
- Code and accessibility compliance claims should always be verified against the specific code edition adopted in your project’s jurisdiction. Provincial adoption of the NBC varies, and municipal amendments can add requirements.
Frequently Asked Questions
What CSI section do anti-slip stair nosings fall under?
Stair treads and nosings are specified under CSI MasterFormat Section 05 55 00. Your specification should follow the CSI 3-part SectionFormat covering General, Products, and Execution.
What is the minimum coefficient of friction for stair nosings?
OSHA recommends a minimum static CoF of 0.5 for walking surfaces. The ADA recommends 0.60 for walkways and 0.80 for ramps. For wet conditions, ANSI A137.1 requires a minimum wet DCOF of 0.42. Always specify the test method alongside the threshold.
How much nosing projection does the IBC allow?
The IBC caps nosing projection at 1¼ inches (32 mm). The ADA allows up to 1½ inches (38 mm), but the stricter IBC limit governs when both apply. The Canadian NBC caps projection at 25 mm.
What LRV contrast is required for stair nosings?
The widely accepted minimum is a 30-point LRV difference between the nosing and the tread. For Canadian projects following CNIB or AODA guidance, a 70% luminance contrast is recommended.
Can rubber nosings be used outdoors in Canada?
Rubber and PVC nosings degrade under UV exposure and lose flexibility in extreme cold. For any exterior application in Canada, FRP or aluminum nosings are the appropriate choices.
What test certificates should I request from the manufacturer?
Request CoF or DCOF test reports (citing the test method), LRV measurement data, and (for exterior applications) UV weathering, salt spray resistance, and freeze-thaw resistance test results.
What is the difference between cast-in-place and surface-mount nosings?
Cast-in-place nosings embed in wet concrete during new construction. Surface-mount nosings attach to existing stairs with mechanical fasteners, adhesive, or both. Surface-mount is the standard for retrofit projects.
Do I need a nosing if my tread depth exceeds 11 inches?
The IBC does not require a nosing projection when the tread depth is 11 inches or more. However, an anti-slip nosing still provides edge protection and visual contrast, which is why most specifiers include one regardless.
Writing product specifications for anti-slip stair nosings is not complicated, but it demands precision. Every term in this glossary represents a decision point. Skip one, and you hand control to someone who may not share your priorities for safety, durability, or code compliance.
If you need help matching specification requirements to specific products, contact Safety Step Canada for specification assistance. You can also visit our FAQ page for answers to common product and ordering questions.