Traps

Building Traps Are Not Approved Fixture Trap Substitutes

Are whole-house building traps allowed by IRC 2021?

P3201.5

Drum Traps Are Generally Prohibited in New IRC Work

Are drum traps allowed under IRC 2021?

P3201.5

Each Plumbing Fixture Needs an Approved Trap

Does every plumbing fixture need a P-trap?

P3201.1

Fixture Trap Size Must Match the IRC Trap Sizing Table

What size P-trap is required for a sink, shower, tub, or washer?

P3201.7

Fixture Traps Must Be Level and Protected From Freezing

Does a P-trap have to be level and protected from freezing?

P3201.3

Grease Interceptors Are Usually a Local Plumbing Requirement, Not an IRC Trap Chapter Rule

Does IRC 2021 require a grease trap or grease interceptor in a house?

P3201.1

One Trap Can Serve Multiple Fixtures Only Where the IRC Allows It

Can two sinks or fixtures share one P-trap?

P3201.6

S-Traps Are Prohibited Because They Can Siphon Dry

Are S-traps illegal under IRC 2021?

P3201.5

Seldom-Used Traps Need Seal Protection Where Required

Does a floor drain need a trap primer under IRC 2021?

P3201.2.1

Trap Arm Length Is Controlled by the Vent Distance Rule

How long can a trap arm be before it needs a vent?

P3105.1

Trap Seals Must Be Deep Enough to Block Sewer Gas

How deep does a plumbing trap seal have to be?

P3201.2