Fire escape stairs have important general design standards. There are four primary parameters for the design of an emergency stairway for an existing building.
• Dimensions: This includes the width of the flights, the standard inclinations, the number of emergency stairs provided, and stability requirements.
• Material: This may be galvanized steel, aluminum, stainless steel. Other materials are rarely used in practice.
• Layout: Options include in-line, crossed, and rectanglular, among others.
• Other options: Other options include counterbalanced stairs, different types of steps and guardrails, paneling, enclosures, and variable heights.