What is the minimum thickness of concrete required for a residential garage floor?

The minimum thickness of concrete required for a residential garage floor is indeed 100 mm. This thickness is generally recommended to ensure adequate strength and durability to withstand the weight of vehicles and resist cracking due to temperature changes and settling. A 100 mm thickness also allows for proper load distribution and enhances the overall structural integrity of the floor.

Using a thickness of 75 mm may not provide sufficient support for heavier vehicles and could lead to problems such as cracking or breaking under load. While options like 125 mm or 150 mm might offer additional strength, they are generally considered excessive for standard residential applications and could unnecessarily increase costs without significant benefit for typical usage. Therefore, the 100 mm specification strikes a balance between performance and efficiency for most residential garage flooring needs.