Master Plumber Practice Exam 2025 – Complete Prep Guide

Question: 1 / 400

What is the minimum depth for the finished dam of a shower threshold from the top of the drain?

4 inches

12 inches

2 inches

The minimum depth for the finished dam of a shower threshold from the top of the drain is 2 inches. This specification is important for maintaining proper drainage and ensuring that water does not overflow from the shower area. A 2-inch threshold depth creates an effective barrier that helps contain water within the shower, preventing leaks or water damage to surrounding areas.

This dimension is also aligned with best practices in plumbing design, which aim to balance functionality and waterproofing considerations. A shower threshold that is properly constructed with a 2-inch dam helps ensure that any water that runs off during use is effectively channeled toward the drain, enhancing overall shower performance and user satisfaction.

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