What is the minimum waste outlet size for a lavatory?

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

What is the minimum waste outlet size for a lavatory?

Explanation:
The minimum waste outlet size for a lavatory is 1 1/4 inches. This size matches the standard lavatory trap and tailpiece, providing enough cross-sectional area for typical bathroom usage and helping prevent frequent clogs. Sizes smaller than this, like 1/2 inch or 1 inch, would bottleneck flow and increase the chance of backing up. A 1 1/2 inch outlet is larger than the minimum and may be used in some installations, but it isn’t the smallest acceptable size for a lavatory.

The minimum waste outlet size for a lavatory is 1 1/4 inches. This size matches the standard lavatory trap and tailpiece, providing enough cross-sectional area for typical bathroom usage and helping prevent frequent clogs. Sizes smaller than this, like 1/2 inch or 1 inch, would bottleneck flow and increase the chance of backing up. A 1 1/2 inch outlet is larger than the minimum and may be used in some installations, but it isn’t the smallest acceptable size for a lavatory.

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