jaspector
§ Chapter 32 IRC 2021

Traps

11 entries from Chapter 32 of IRC 2021, organized by section number. Each entry covers what the code requires, why it exists, what inspectors look for, and common mistakes.

ED IRC 2018 ED IRC 2021 ED IRC 2024
§ 01   Sections

All 11 entries.

Sorted by section number. Click any row for the full entry — answer, requirements, edition diff, related sections.

Trap Arm Length Is Controlled by the Vent Distance Rule
P3105.1
How long can a trap arm be before it needs a vent?
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Each Plumbing Fixture Needs an Approved Trap
P3201.1
Does every plumbing fixture need a P-trap?
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Grease Interceptors Are Usually a Local Plumbing Requirement, Not an IRC Trap Chapter Rule
P3201.1
Does IRC 2021 require a grease trap or grease interceptor in a house?
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Trap Seals Must Be Deep Enough to Block Sewer Gas
P3201.2
How deep does a plumbing trap seal have to be?
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Seldom-Used Traps Need Seal Protection Where Required
P3201.2.1
Does a floor drain need a trap primer under IRC 2021?
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Fixture Traps Must Be Level and Protected From Freezing
P3201.3
Does a P-trap have to be level and protected from freezing?
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Building Traps Are Not Approved Fixture Trap Substitutes
P3201.5
Are whole-house building traps allowed by IRC 2021?
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Drum Traps Are Generally Prohibited in New IRC Work
P3201.5
Are drum traps allowed under IRC 2021?
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S-Traps Are Prohibited Because They Can Siphon Dry
P3201.5
Are S-traps illegal under IRC 2021?
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One Trap Can Serve Multiple Fixtures Only Where the IRC Allows It
P3201.6
Can two sinks or fixtures share one P-trap?
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Fixture Trap Size Must Match the IRC Trap Sizing Table
P3201.7
What size P-trap is required for a sink, shower, tub, or washer?
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§ 02   Chapter navigation