Transport for London (TFL) and London Underground
AATi (Antislip Antiwear Treads International) formed in 1984 and adopted the traditional TFL/London Underground cast stair tread designs, which have been an enduring and very effective feature on the UK rail network for over 60 years.
AATi products are deep tube approved and registered for use on the London Underground’s Approved Product Register (APR). Products registered on this register endure numerous testing requirements and must comply to strict guidelines as set out in the main standards; Category 1 Standard no 1-33 refers to Premises and stairways coupled with Category 1 standard 1-085 Fire safety classification.
Category 1 standard S1133: Premises- Stairways and Ramps
1.1 The purpose of this standard is to define the performance requirements for stairways, steps, fixed ladders, ramps and handrails in all operational LU premises and property.
2.1 This standard applies to new and altered public stairways, temporary stairways, fire escape stairways, non-public stairways and steps, fire fighting stairways, fixed ladders, public ramps, non-public ramps, fire escape ramps and temporary ramps.
2.2 For existing public stairways, refer to CIRIA C722 Safer stairs in public places – assessment of existing stairs.
2.3 For stairways and ramps loading requirements, refer to S1053 Civil Engineering – Building and Station Structures.
2.4 For embankment/embankment/cutting step design, refer to S1054 Civil Engineering – Earth structures.
Category 1 standard 1-085: Fire safety performance of materials
The purpose of this Standard is to define the requirements for the fire safety of materials, in terms of flammability, smoke emission and toxic fume emission, installed on the London Underground (LU) network:
1.2 The business objective of this standard is to ensure that the risk to which the public
and employees are exposed is controlled to a level that is as low as reasonably
2.1 This standard specifies the requirements for materials installed in underground
locations with regard to:
a) Flammability (including the risk of explosion);
b) Smoke emission;
c) Toxic fume emission.
Note: This standard does not cover the wider aspects of fire engineering, and it may benecessary to invoke other London Underground, National or European Standards tocover fully all aspects of fire safety for a particular application.
2.2 This standard shall apply to installations:
a) In stations covered by Section 12 of the Fire Precautions (Sub-Surface Railway
Stations) Regulations 1989 and 1-086;
b) In passenger and engineering trains;
c) In running tunnels;
d) In other locations that are not effectively separated from locations covered by a)
or c) above;
e) In all other locations where risks from flammability, smoke or toxic fumes are not
controlled to a level as low as reasonably practicable by other means.