Plumber Red Seal · Question
According to the National Plumbing Code, what is the maximum support spacing for 1-inch nominal size, horizontal PEX tubing?
PEX tubing is flexible and requires more frequent support than rigid pipes like copper or steel. For horizontal runs of 1-inch PEX (or smaller), the NPC typical
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Question: According to the National Plumbing Code, what is the maximum support spacing for 1-inch nominal size, horizontal PEX tubing?
Answer options:
- 600 mm (24 in) ✅ 800 mm (32 in)
- 1000 mm (40 in)
- 1200 mm (48 in)
Correct answer: 800 mm (32 in)
Explanation: PEX tubing is flexible and requires more frequent support than rigid pipes like copper or steel. For horizontal runs of 1-inch PEX (or smaller), the NPC typically requires a maximum support spacing of 800 mm (32 inches) to prevent sagging.
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