The BoSS Ladderspan ladder frames (available in 0.85m and 1.45m widths) are aluminium sections designed for constructing single and double-width mobile access towers. These frames integrate a sturdy tower frame with a built-in climbing ladder, forming a key structural element of the system. Available in 2-rung, 3-rung, and 4-rung variations, these frames offer flexibility to suit various height needs. Manufactured in the UK, they are lightweight, durable, and comply with EN 1004-1:2020 standards. These frames ensure stable tower builds for maintenance, decorating, electrical, and construction work, supporting platform heights up to 12.2m. The ribbed ladder rungs provide secure, comfortable access, and the frames are compatible with BoSS span frames, braces, platforms, and stabilisers, allowing flexible configurations using the 3T (Through the Trapdoor) build method.
Available options:
- 2 Rung Ladder Frame (0.85m – 60851300 or 1.45m – 61151300) – For base or low-level sections.
- 3 Rung Ladder Frame (0.85m – 60751300 or 1.45m – 61051300) – Versatile mid-height option.
- 4 Rung Ladder Frame (0.85m – 60651300 or 1.45m – 60951300) – For higher tower extensions.
Key features
- Integrated ladder design: The internal ladder is built in and features 250mm rung spacing, making climbing easy on the body and safe when setting up the tower using the 3T method.
- Ribbed extruded aluminium: The non-slip rungs and horizontal bars ensure secure footing, whether conditions are wet or dry.
- 500mm frame rung spacing: The comfortable rung spacing allows for smooth and controlled climbing up and down.
- Tube-to-tube construction: This design offers outstanding strength, stiffness, and durability compared to traditional-welded frames.
- Lightweight high-grade aluminium: Resistant to corrosion and simple to handle, thanks to top-quality robotic manufacturing.
- System compatibility: Explicitly made for BoSS 1.45m Ladderspan towers, guaranteeing EN 1004-1:2020 compliance when paired with authentic BoSS parts.
- Professional-grade reliability: As part of the dependable BoSS system, these frames are trusted by professional tradespeople and rental companies.
Product FAQs
What are the exact weights of each ladder frame variant?
0.85m width
• 2 Rung (60851300): Approximately 4.4kg.
• 3 Rung (60751300): Approximately 6.2kg.
• 4 Rung (60651300): Approximately 8.0kg.
1.45m width
• 2 Rung (61151300): Approximately 5.1kg.
• 3 Rung (61051300): Approximately 7.0kg.
• 4 Rung (60951300): Approximately 9.5kg.
What are the exact dimensions of this product?
0.85m Width
2-rung ladder
• Open height: 1.09m.
• Width: 0.06m.
• Open length: 1.0m.
• Open depth: 0.92m.
• Rung pitch: 0.25m.
3-rung ladder
• Open height: 1.59m.
• Width: 0.06m.
• Open length: 1.5m.
• Open depth: 0.92m.
• Rung pitch: 0.25m.
4-rung ladder
• Open height: 2.09m.
• Width: 0.06m.
• Open length: 2.0m.
• Open depth: 0.92m.
• Rung pitch: 0.25m.
1.45m width
2-rung ladder
• Open height: 1.09m.
• Width: 0.06m.
• Open length: 1.0m.
• Open depth: 1.52m.
• Rung pitch: 0.25m.
3-rung ladder
• Open height: 1.59m.
• Width: 0.06m.
• Open length: 1.5m.
• Open depth: 1.52m.
• Rung pitch: 0.25m.
4-rung ladder
• Open height: 2.09m.
• Width: 0.06m.
• Open length: 2.0m.
• Open depth: 1.52m.
• Rung pitch: 0.25m.
Are BoSS ladder frames easy to handle?
The aluminium frames are lightweight and easy to manoeuvre, reducing fatigue during setup and transportation while maintaining the rigidity needed for safe operation.
How are the ladder frame components used on a scaffold tower?
Ladder frames are primarily used as structural elements in the construction of safe access towers. These components seamlessly integrate with BoSS aluminium ladderspan systems to create stable platforms for elevated work in construction, painting, electrical installations, and maintenance.
Are these frames compatible with other tower brands?
No. For safety and certification reasons, BoSS components must only be used with genuine BoSS parts. Mixing with other manufacturers invalidates EN 1004 compliance and can compromise stability.
Is the ladder frame compatible with other BoSS products?
Yes, they are fully compatible with all BoSS aluminium ladderspan tower builds. For best results, ensure all components are from the BoSS range to maintain structural integrity and safety compliance.
What build methods are supported?
These frames support the 3T (Through the Trapdoor) method for safe erection from within the platform.
How do I choose the right rung variant?
It is recommended to start with 2-rung frames at the base for stability, add 3-rung frames for the mid-sections, and use 4-rung frames for the upper levels. Refer to the BoSS quantity schedules in the instruction manual for your desired platform height.
What are the exact weights of each ladder frame variant?
- 2 Rung (61151300): Approximately 5.56kg.
- 3 Rung (61051300): Approximately 8.05kg.
- 4 Rung (60951300): Approximately 10.55kg.
The lightweight design makes handling and transporting easier while maintaining structural integrity.
Why do the frames have different rung counts (2, 3, or 4 rungs)?
The rung variants correspond to different height increments:
- 2 Rung: 1.0m height – Commonly used for base levels or lower sections to provide stability.
- 3 Rung: 1.5m height – Versatile for mid-level extensions.
- 4 Rung: 2.0m height – Ideal for upper levels or taller extensions.
This allows flexible tower configurations, with typical builds starting with 2-rung frames at the base, adding 3-rung in the middle, and 4-rung higher up for optimal platform spacing.
What is the difference in rung spacing on the frames?
- Climbing rung spacing (on the integrated ladder): 250mm – Ergonomically designed for comfortable, fatigue-reduced ascent and descent.
- Horizontal frame rung spacing: 500mm – Provides secure hand/foot holds and attachment points for braces and platforms.
Are the frames equipped with floating spigots?
Yes, all BoSS Ladderspan ladder frames (1.45m wide) feature floating frame spigots. These enable quicker, tool-free assembly and dismantling by facilitating easy alignment when stacking frames.
Are BoSS ladder frames EN1004 certified?
Yes, when used as part of a complete BoSS Ladderspan tower system, it complies with EN1004 standards for mobile access and working towers, supporting safe 3T assembly methods.
How does the ribbed rung design improve safety?
The ribbed rungs, made from aluminium tubing, provide enhanced grip to prevent slips, especially in wet or dusty environments. This feature aligns with professional safety guidelines for elevated work.
Can the frames be used in outdoor environments?
Yes, its high-grade aluminium construction offers excellent corrosion resistance, making the BoSS 4 rung ladder frame suitable for both indoor and outdoor use in construction or industrial settings. Always follow BoSS assembly guidelines for optimal performance.
Can these frames be used for external climbing?
No. Climbing should always be done internally via the integral ladder using the 3T method for maximum safety.
What is the maximum tower height when using this component?
Tower height depends on the configuration, stabilisers, and build method. Always refer to the BoSS user guide and EN 1004 standards. Professional assembly and risk assessment are recommended.
How do I maintain and inspect a ladder frame?
Regularly check for damage, deformation, or wear on rungs and joints. Clean as needed and store in a dry environment. BoSS recommends inspections before each use in line with PASMA guidelines.
Where should it be positioned in the tower assembly?
The ladder frame should always be positioned with the integral ladder facing inward, and the trapdoor platform placed directly adjacent to it (hinges outward). This ensures safe internal access and compliance with the 3T (Through the Trapdoor) build method, allowing climbing only from inside.
Can the 3-rung ladder frame be mixed with a 2-rung or 4-rung frame in the same tower?
Yes. BoSS Ladderspan towers commonly mix frame sizes (e.g., starting with 2-rung base frames and adding 3- or 4-rung frames higher up) to achieve precise platform heights. All frames are fully interchangeable within the same width, eg 0.85m single-width or 1.45m double-width system.
How do I install this component?
Secure the frame using compatible clips and braces, follow manufacturer guidelines, and perform a safety check before use. PASMA training is recommended.
Are BoSS ladder frames safe for heavy-duty use?
Absolutely, when used as part of a certified BoSS tower system. Our ladder frames are constructed from high-quality aluminium and designed to support standard loads in professional settings. Regular inspections and adherence to weight limits are essential for safety.
Q & A
BoSS Ladderspan Ladder Frame Components
