What is the minimum waste outlet size for a lavatory?

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Study for the NOCTI Plumbing Test. Engage with flashcards and multiple-choice questions, each supported by hints and explanations. Prepare effectively for your 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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