What is the minimum height for a finished curb threshold in shower receptors?

The minimum height for a finished curb threshold in shower receptors is 1 inch. This specification is crucial to ensure proper drainage and to prevent water from leaking out of the shower area. A curb threshold that is at least 1 inch high helps to contain water within the shower receptor, which is especially important in preventing water damage to surrounding areas of the bathroom.

Additionally, a threshold height of 1 inch is practical because it provides a balance between creating a barrier against water intrusion and maintaining accessibility for users. Higher thresholds may create challenges for individuals with mobility issues, making it less user-friendly.

This standard is part of the guidelines provided in the International Residential Code (IRC), which aims to promote safety, health, and accessibility in residential settings.