News: Sertus Live 2 – Bridging the gap between design, safety and real-world firefighting Read now

Products

Concertina Ladder

Overview Tech Specs Size Guide Downloads FAQ Get a Quote

Concertina Ladder

A robust, retractable ladder designed for safe, heavy-duty access to roof spaces, plant rooms, and service areas – engineered for strength, stability, and ease of operation.

System type

Access

Customisations available

Sizes

Mounting options

Lead times

Stock: 1–5 working days

Made to order: N/A

Dedicated Sertus delivery

Delivered with care by our own fleet and trusted logistics partners – ensuring each unit arrives safely, on time, pre-tested, and ready for installation.

Get a quote Download Datasheet

At a Glance

Heavy-duty build for safe access

Space-saving retractable design

Quick install, fully assembled

Safe to use with handrail and grip treads

Strong aluminium construction

Tested to DIN EN 14975 standards

Key Features

Heavy-duty, fully retractable access ladder for industrial and service environments
Supports 200 kg per tread / 500 kg/m² total load capacity
Counterbalanced, self-supporting operation for smooth extension and retraction
Telescopic handrail system ensures secure and stable use
Optional custom mounting frame and trim kits available
Ideal for access to plant rooms, roof spaces, and maintenance areas

Standard sizes available for ceiling heights up to 3400 mm
Die-cast aluminium frame with non-slip tread profile
Tread dimensions: 350 / 300 × 140 mm deep

View size guide

Certifications

Manufactured and tested to DIN EN 14975 / DIN 4570
Verified for industrial-grade safety and load performance
Conforms to typical site, plant-room, and maintenance-access specifications

View tech specs

Description

The Sertus Concertina Ladder is a heavy-duty retractable access solution designed for safe and reliable use in industrial and commercial environments. Manufactured to DIN EN 14975 and DIN 4570 standards, it delivers exceptional load capacity – supporting up to 200 kilograms per tread and 500 kilograms per square metre. Read more

Tech Specs

Load Capacity

200 kg per tread / 500 kg/m²

Construction

Die-cast aluminium

Tread Dimensions

350 / 300 × 140 mm deep

Handrail

Telescopic, fold-away design

Operation

Fully counterbalanced, self-supporting

Standard Sizes

Four models – up to 3400 mm ceiling height

Finish

Natural aluminium, corrosion-resistant

Mounting Options

Ceiling-mounted or frame-mounted configurations

Certification

DIN EN 14975 / DIN 4570

Application

Industrial, plant room, roof and service access

Safety Features

Non-slip treads / stabilised handrail / secure locking system

Durability

Heavy-duty design for repeated operational cycles

Size Guide

Part Reference	To Suit Floor to Ceiling Height of	No. of Treads
24.9000	up to 2500 mm	9
24.9001	up to 2800 mm	10
24.9002	up to 3100 mm	11
24.9003	up to 3400 mm	12

Check Lead Times

Use our handy PDF guide below to check lead time information for the specification you need.

View Lead Times Guide Get a Quote

Downloads

Complete Documentation Pack

Download a zip file containing all documents for this product.

Technical Data Sheet (Concertina Ladder)
Technical Data Sheet (Extra Treads)
Installation Guide
Operation & Maintenance Manual
Warranty

Download Pack

Technical Data Sheet (Concertina Ladder)

Detailed technical information in PDF format

Download PDF

Technical Data Sheet (Extra Treads)

Detailed technical information in PDF format

Download PDF

Installation Guide

Detailed installation instructions for the RAL-R | CL

Download PDF

Operation & Maintenance Manual

How to use and care for your Concertina Ladder (RAL-R | CL)

Download PDF

Warranty

Product warranty in PDF format

Download PDF

FAQ

Choose a category

Is the ladder lockable in its closed position?

No, the ladder itself is not lockable in the closed position. If a trapdoor is included, it can be lockable or electronically secured, but access to the lock must be considered.

Do you offer removable ladders?

We don’t supply removable ladders at the moment.

What angle should the ladder be set at?

We recommend setting the ladder at approximately 20 degrees, though this may vary slightly depending on the height range of the units.

What is the minimum clearance between the ladder and the ceiling?

Our minimum dimensions are for the ladder to function properly. However, the clearance for an operative to pass through depends on a site-specific risk assessment and the intended purpose and frequency of use.

What is the maximum height from the top of the ladder to the opening?

We recommend that the distance does not exceed 250-300mm.

Can the angle of the ladder be changed to avoid clashing when extended?

No, the ladder’s angle cannot be adjusted. If clashing occurs, we recommend using fixed vertical ladders, which we don’t supply.

Related Case Studies

Explore real projects using our smoke ventilation products across both residential and commercial sectors.

View all case studies

Merseyside Fire & Rescue Training Academy

Mechanical and natural smoke ventilation products to support realistic fire training scenarios at a Training Academy in the UK.

Sector

Public

System Type

Mechanical, Natural

Client

Maclec

Products

Pod™ Mini, RSL-R, SLD

View Case Study

Jaguar Land Rover Showroom

Mechanical smoke ventilation products to safeguard lives, property, and prestige vehicles in a landmark commercial development.

Sector

Commercial

System Type

Mechanical

Client

Ambivent Facilities Management

Products

RSL-R, SLD, Pod™ Original

View Case Study

Station Quarter

Fully mechanical smoke ventilation products for compliant, efficient operation across a new-build residential development in Northamptonshire.

Sector

Low-Rise Residential

System Type

Mechanical

Client

Gallico Systems

Products

Pod™ Mini, RSL-R, SLD

View Case Study

Find the right system for your project

We don’t design or install full systems – we manufacture the certified products that form them. Choose a system type below to understand how it functions, where it is used, and which Sertus products are required for compliance.