Specification
3
3.2 LANDINGS/PLATFORMS
3.2.1 Engineering
3.2.1.1 Landings/platforms shall be designed for a minimum uniform live load of 100
pounds per square foot and a concentrated static vertical load of 300 pounds.
3.2.2 Materials
3.2.2.1 Landings/platforms shall be constructed of 6000 series aluminum alloy with
6061-T6 or 6005-T5 for primary structural components.
3.2.3 Design
3.2.3.1 Landings/platforms shall be prefabricated in typical 65-1/2” square, 77-1/2”
square, 65-1/2” x 77-1/2” rectangular or 65-1/2” x 89-1/2” rectangular sections.
3.2.3.2 Landings/platforms shall be designed for variable heights.
3.2.3.3 The walking surface of the landing/platform shall be continuous, without gaps,
and shall be comprised of approximately 1-1/4” x 6” high self-mating aluminum
deck with extruded slip resistant surface.
3.3 STEPS
3.3.1 Engineering
3.3.1.1 Step Systems shall be designed for a minimum uniform live load of 100 pounds
per square foot and a concentrated vertical load of 300 pounds over an area of 4
square inches.
3.3.2 Materials
3.3.2.1 Step Systems shall be constructed using 6000 series aluminum alloy with 6061-T6
or 6005-T5 being used for primary structural components.
3.3.3 Design
3.3.3.1 Step risers shall be between 7” maximum and 4” minimum (6” typical) high and
shall be closed.
3.3.3.2 Step treads shall be 11” minimum deep x 48” minimum wide between handrails,
53-3/4” between siderails.
3.3.3.3 The walking surface of the step shall be without gaps and shall be composed of
self-mating aluminum treads and riser closures with an extruded slip resistant
surface.
3.4 LEGS
3.4.1 Engineering
3.4.1.1 The legs shall be designed to support the ramp and landing/platform sections
(see sections 3.1.1.1 and 3.2.1.1).
3.4.2 Materials
3.4.2.1 Legs shall be all aluminum construction alloy 6061-T6 or 6005-T5.
3.4.3 Design
3.4.3.1 The legs shall allow for height and slope adjustments. Legs shall be designed so
that they will be perpendicular to the ground and vertical loads are transmitted
axially through them, regardless of slope.
3.4.3.2 All legs shall have through bolted polymer 7-3/8” x 7-3/8” feet.