§ Chapter 30 IRC 2021
Sanitary Drainage
10 entries from Chapter 30 of IRC 2021, organized by section number. Each entry covers what the code requires, why it exists, what inspectors look for, and common mistakes.
§ 01 Sections
All 10 entries.
Sorted by section number. Click any row for the full entry — answer, requirements, edition diff, related sections.
Section
Title
Question
P3001.1
The Building Drain Connects the House Drainage System to the Building Sewer
P3001.1
What is the difference between a building drain and building sewer?
What is the difference between a building drain and building sewer?
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P3005.1
Drainage Fittings Must Guide Waste in the Direction of Flow
P3005.1
Can I use a sanitary tee on its back for a drain?
Can I use a sanitary tee on its back for a drain?
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P3005.1
Floor Drains Need Traps, Venting, Slope, and Trap Seal Protection
P3005.1
Are floor drains required or allowed in a residential garage or basement?
Are floor drains required or allowed in a residential garage or basement?
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P3005.1
Wet-Vented Bathroom Drains Must Follow Fixture and Order Limits
P3005.1
Can a toilet, shower, and lavatory share a wet vent?
Can a toilet, shower, and lavatory share a wet vent?
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P3005.1.6
Indirect Waste Needs an Air Gap or Air Break to an Approved Receptor
P3005.1.6
What is an indirect waste and when is it required?
What is an indirect waste and when is it required?
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P3005.2
Cleanouts Must Be Placed Where Drains Can Be Rodded
P3005.2
Where are plumbing cleanouts required in a house?
Where are plumbing cleanouts required in a house?
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P3005.2.9
Island Sink Drainage Must Coordinate the Loop Vent and Cleanouts
P3005.2.9
How do you vent a kitchen island sink under IRC?
How do you vent a kitchen island sink under IRC?
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P3005.3
Horizontal Drainage Pipe Needs Minimum Slope to Carry Solids
P3005.3
What slope is required for residential drain pipe?
What slope is required for residential drain pipe?
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P3005.4
Drain Pipe Size Depends on Fixture Units and Minimum Fixture Sizes
P3005.4
What size drain pipe do I need for a bathroom or kitchen fixture?
What size drain pipe do I need for a bathroom or kitchen fixture?
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P3008.1
Backwater Valves Protect Fixtures Below the Upstream Sewer Manhole
P3008.1
When is a backwater valve required in a basement bathroom?
When is a backwater valve required in a basement bathroom?
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