Substructure
Class A2-s1,d0 Rail System
Substructure for non-combustible decking and tiling systems
Key Advantages
- Full Metal Substructure, made from galvanised steel
- Class A2-s1,d0 non-combustible material (EN 13501-1:2018)
- Complies to BS EN ISO 1716:2018
- Physically tested in accordance with procedure specified in BS EN 13823:2020
- Profiled Aluminium Joist clicks securely onto MetalPad
- Secure connection without mechanical fixings
- Suitable decking and paving solutions
- Very high weight tolerance
- Zero corrosion
- Creates lateral stability across deck by reducing movement
- Adjustable height with maximum flexibility
- Fully compliant with draft BS 8579

Paving / Tiling Applications
Specially profiled aluminium rails 20mm, 25mm or 50mm click onto headpiece without need for screws, drills or mechanical fixings for secure connection.
Powder coated headpiece prevents any reaction between steel and aluminium.
- Integrated Class A2-s1,d0 Rail system for installing porcelain tiles and ceramic planks
- Specially profiled bearer rails / joists click onto headpiece of Metalpad
- Designed to give greater support to slabs and tiles and additional lateral strength across the deck
- Faster installation of suspended paving and tiling projects
- Secure connection into spring loaded headpiece fittings; no screws, no drilling on site
- Large baseplates distribute weight efficiently reducing point loading
- Greater spans between pedestals possible
- Joist helps “tie together” pedestals, giving more lateral strength across the decking surface
- Large height range using three different sized joists
- Powder coated headpiece prevents reaction between steel and aluminium joist
- Additional headpiece clicks onto joist to hold slab / tile in place
- Clip head has four lugs for full support and uniform spacing of tile
- Clip head slides along Rail for accurate measurement and total support
- Fast, safe, secure construction of substructure

Decking Applications
- Fully integrated substructure system for installing Class A2-s1,d0 decking
- Specially profiled bearer rails / joists click onto headpiece of Metalpad
- Secure connection into spring loaded headpiece fittings; no screws, no drilling on site
- Large height range using three different sized joists
- Greater spans between pedestals possible
- Large baseplates distribute weight efficiently reducing point loading
- Powder coated headpiece prevents reaction between steel and aluminium joist
- Joist helps “tie together” pedestals, giving more lateral strength across the decking surface
- Class A2-s1,d0 decking surface fixed to joist
- Fast, safe, secure construction of substructure

The Rail / Joist
Cross section:

Fire Regulations
Our Class A2-s1, d0 rail system meets fire testing standard BS EN ISO 1716:2018
Certified Class A2-s1, d0 (Warrington Fire) – Powder Coating | Steel
They are classified in Class A (‘No contribution to fire’) in
Decision 94/611 /EC
This product has been developed to ensure compliance with:
- Draft BS 8579
- Amendment to Approved Document B May 2020
- Approved Document B 2019
- Advice Note on Balconies in Residential Buildings published by Department of Housing, Communities & Local Government (MHCLG) issued on 24 June 2019
- Regulation 38 of the Fire Safety Building Regulations published by the Government
For further information or to discuss a project, speak to a member of our technical team. Call us on 020 8916 2222 or send us a message here.
NBS Source
- Class A Substructure for Non-Combustible Decking Systems
- Class A Substructure for Non-Combustible Paving Systems
- Class A1 Fire Rated Pedestal
- Class A2 Fire Rated Decking Pedestal
BIM Library
CAD Drawings
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25mm Ledged Rail
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50mm Ledged Rail
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Class A2-s1, d0 Pedestal for Decking 25-32mm
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Class A2-s1, d0 Pedestal for Decking 32-39mm
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Class A2-s1, d0 Pedestal for Decking 39-46mm
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Class A2-s1, d0 Pedestal for Decking 46-53mm
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Class A2-s1, d0 Pedestal for Decking 53-70mm
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Class A2-s1, d0 Pedestal for Decking 70-100mm
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Class A2-s1, d0 Pedestal for Decking 100-140mm
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Class A2-s1, d0 Pedestal for Decking 140-220mm
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Class A2-s1, d0 Pedestal for Decking 220-300mm
Material | Aluminium 6063T6 | EN 755-9 | ||
To Use With Pedestal | Click Head Pedestal Range | |||
Fixing Detail | Click function - zero mechanical fixings | |||
Fire Classification | Class A2-s1,d0 | BS EN 13501-1 2018 | ||
European Commission Decision 96-603-EC | ||||
B ROOF T4 | ||||
Approved Document B, Regulation 7 (2) | ||||
Balcony construction suitability | > 11m | BS 8579 | ||
Weight tolerance per m² | 600kg | |||
Height of rail / bearer | 20mm | 25mm | 50mm | |
Maximum span between pedestals | 50cm | 60cm | 120cm | based on 600kg per m2 weight |
Weight per lin mtr | 0.988kg | 1.998kg | ||
Exterior circumference | 184.96mm | 234.97mm | ||
Interior circumference | 175.30mm | 261.32mm | ||
Thickness of walls / floor | 2mm | 2mm | 3mm | |
Outer height | 20mm | 25mm | 50mm | |
Inner height | 16mm | 21mm | 46mm | |
Outer width | 60mm | 60mm | 60mm |