FRP Guides

FRP Handrail Systems: A Guide to Design, OSHA Dimensions and Selection

In short: FRP handrail systems are guardrails and stair rails made from pultruded fiberglass rails and posts joined with molded connectors. They do not rust, are non-conductive, stay comfortable to touch, and are pigmented safety yellow (or another color) throughout. In the USA, OSHA 29 CFR 1910.29 requires guardrail top rails at 42 in ±3 in (107 cm), withstanding a 200 lb (890 N) load, with midrails and intermediate members withstanding 150 lb (667 N). Other countries have their own rules, such as ISO 14122-3 for machinery access. Size posts, spacing and fixings so the complete system meets the code that applies to your site.

FRP Handrail Systems: A Guide to Design, OSHA Dimensions and Selection – In short summary: key points at a glance

Table: System components – FRP Handrail Systems — System components. Summary diagram of the table in this guide.

Why FRP handrails?

Corrosion resistance in wastewater, chemical, coastal and offshore areas where galvanized steel deteriorates
Electrical insulation near live equipment
Low thermal conductivity: rails don't get as hot or cold to the touch as metal
High visibility: color runs through the profile, with no painting needed for corrosion protection
Light weight: easier installation on existing structures

System components

Component	Description
Top rail	Round or square pultruded tube; the main load-bearing rail
Midrail	Intermediate rail roughly midway between top rail and walking surface
Posts	Square or round tubes at set spacing
Toeboard (kick plate)	Prevents objects falling from the platform edge
Connectors	Molded or fabricated FRP fittings joining rails and posts
Base plates and brackets	Fix posts to the deck (top-mounted) or the edge (side-mounted)
Fasteners	Stainless steel bolts or rivets, plus adhesive where specified
Gates and openings	Self-closing gates at ladder openings, removable sections

See our FRP handrail systems.

OSHA guardrail requirements (USA, general industry)

The following are from 29 CFR 1910.29(b), which covers guardrail systems in general industry:

Top rail height: 42 in (107 cm), plus or minus 3 in, above the walking-working surface
Top rail strength: capable of withstanding a force of at least 200 lb (890 N) applied in a downward or outward direction within 2 in (5 cm) of the top edge, at any point along the top rail. When the load is applied, the top rail must not deflect to a height below 39 in (99 cm).
Midrails, screens and intermediate members: withstand at least 150 lb (667 N) applied in any downward or outward direction
Midrail position: midway between the top rail and the walking-working surface
Openings: intermediate vertical members (balusters), when used instead of midrails, no more than 19 in (48 cm) apart, and other intermediate members arranged so openings are no more than 19 in (48 cm) wide
Toeboards (where used for falling object protection): at least 3.5 in (9 cm) high and able to withstand 50 lb (222 N)
Surfaces: smooth enough to prevent punctures, lacerations or snagging of clothing

Stair rail systems and handrails on stairs have separate requirements in 1910.29(f). Fall protection for ladder openings uses gates or offsets per 1910.29(b)(13). Always confirm the current regulation text for your jurisdiction.

Diagram: OSHA guardrail requirements (USA, general industry) – FRP Handrail Systems — OSHA guardrail requirements (USA, general industry): summary diagram from this guide.

Other codes

ISO 14122-3: permanent means of access to machinery: stairs, stepladders and guardrails
EN ISO 14122 is adopted in Europe, and national building codes may also apply
Australia: AS 1657 covers fixed platforms, walkways, stairways and ladders
UK: BS 6180 (barriers in and about buildings) and the Work at Height Regulations

Tell us which code applies, and we will design the post spacing and connections to suit.

Design choices

Round vs square rail

Round top rails are comfortable to grip and common for stair handrails. Square tube systems are often more economical and simpler to connect. Many projects use a round top rail with square posts.

Post spacing

Post spacing affects whether the system meets the load requirement. Typical FRP systems specify a maximum post spacing based on testing or calculation for that system. Do not exceed the manufacturer's spacing.

Mounting

Top-mounted on the deck: simple and common
Side-mounted on the edge: saves walkway width
Embedded or cast-in: for concrete

Fixings

Use stainless steel fasteners. Bonded-and-bolted connections are common, and every cut end should be sealed.

Installation basics

Set out post positions per the layout drawing and manufacturer spacing.
Fix base plates to a sound structure. Anchor capacity matters as much as the rail.
Assemble rails into connectors and bolt or rivet as specified.
Seal all cut ends and drilled holes with resin.
Fit toeboards and gates.
Inspect alignment and connection tightness.

Maintenance

Inspect connectors and anchors periodically. Wash off contamination. For long outdoor exposure, check for surface weathering. A UV coating can refresh older rails.

Customization

FIBROVX supplies handrail systems to your layout: rail and post profiles, colors (safety yellow, gray, green and others), mounting types, gates, toeboards and pre-cut kits with assembly drawings. We also supply FRP ladders, molded grating and pultruded profiles for complete platforms. Browse the grating, profiles and access collection.

Need a quote or a drawing check?

FIBROVX manufactures FRP products in our own factory in China and builds every item to order: sizes, resin system, color, molds and OEM branding. Send your application, dimensions or drawing, quantity and destination port.

Request a Quote

Common mistakes

Using the wrong fixing for the substrate. Base plates must be anchored with fixings suited to concrete, steel or FRP structure, and to the loads.
Spacing posts too far apart. Post spacing is set by the rail and post sections and the required loads. Don't extend spacing beyond the design.
Leaving out toeboards. Where tools or materials can fall from a platform, toeboards may be required.
Not planning gates. Openings at ladders and access points need gates or offsets.

Key terms

Guardrail: A barrier that prevents falls from an edge.
Stair rail: A barrier along the open side of a stair.

Watch: FRP Handrail Systems in 27 Seconds

A 27-second visual summary: FRP Handrail Systems (captions on screen).

FAQ

How high must a guardrail be under OSHA?

42 in plus or minus 3 in (107 cm) above the walking-working surface, per 29 CFR 1910.29(b)(1).

What load must an FRP guardrail withstand?

Under OSHA, the top rail must withstand at least 200 lb (890 N) applied downward or outward, and midrails and other intermediate members 150 lb (667 N).

Is FRP handrail as strong as steel?

FRP handrail systems are designed with appropriate profiles and post spacing to meet the required loads. They are less stiff than steel, so systems are verified for deflection as well.

What color are FRP handrails?

Safety yellow is most common, but gray, green and other colors can be pigmented to order.

Can FRP handrails be used outdoors?

Yes, with UV-inhibited resin and a surface veil. Periodic inspection is recommended.

Related guides

Sources

OSHA, 29 CFR 1910.29 "Fall protection systems and falling object protection – criteria and practices": https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.29
ISO 14122-3 "Safety of machinery – Permanent means of access to machinery – Part 3: Stairs, stepladders and guard-rails" (ISO catalog: https://www.iso.org/search.html?q=14122-3)
Standards Australia, AS 1657:2018 "Fixed platforms, walkways, stairways and ladders": https://www.standards.org.au/standards-catalogue/standard-details?designation=as-1657-2018