Lavatory minimum trap size is specified as?

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Prepare for the Illinois State Plumbing Test. Use flashcards and multiple-choice questions with hints and explanations to enhance your knowledge. Ensure your success on exam day!

Multiple Choice

Lavatory minimum trap size is specified as?

Explanation:
Lavatory traps are sized to handle the typical flow from a bathroom sink while staying within venting and trap-seal requirements. The smallest standard trap size that reliably prevents trap siphon and maintains a proper water seal for a lavatory is 1-1/4 inches. A smaller size would risk siphoning and inadequate drainage, while larger sizes are not necessary for a standard lavatory and are more common for higher-flow fixtures. So the minimum trap size specified for a lavatory is 1-1/4 inches.

Lavatory traps are sized to handle the typical flow from a bathroom sink while staying within venting and trap-seal requirements. The smallest standard trap size that reliably prevents trap siphon and maintains a proper water seal for a lavatory is 1-1/4 inches. A smaller size would risk siphoning and inadequate drainage, while larger sizes are not necessary for a standard lavatory and are more common for higher-flow fixtures. So the minimum trap size specified for a lavatory is 1-1/4 inches.

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