What thickness is required for a wall made of solid sand-lightweight concrete to achieve a fire resistance rating of 4 hours?

To achieve a fire resistance rating of 4 hours with a wall made of solid sand-lightweight concrete, a thickness of 5.4 inches is required. This thickness ensures that the wall can effectively withstand high temperatures over an extended period without allowing the interior or any contents to ignite.

The materials used for constructing walls, including sand-lightweight concrete, provide specific fire resistance characteristics based on their density, composition, and thickness. Codes and standards typically outline the minimum thicknesses needed to meet various fire resistance ratings. In the case of a 4-hour rating, it has been determined through testing and analysis that 5.4 inches is the optimal thickness to ensure the wall can provide adequate protection against fire exposure.

Other thickness options, while potentially suitable for different fire resistance ratings, do not meet the necessary criteria for achieving the 4-hour rating effectively.