Concept and design
Choosing a Space-Saving Staircase Design - What is Legal and What Isn't?
...Alternating tread stairs: the 'ship stair'
Alternating tread stairs, also known as 'ship stairs,' are a clever design where each step is only half the width of the staircase. This allows the user to ascend and descend by alternating their feet, as if climbing a ladder.
This unique design allows for a much steeper angle...
