§ Chapter 26 IRC 2021
General Plumbing Requirements
10 entries from Chapter 26 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
P2601.2
Fixtures Must Connect to Approved Water and Drainage Systems
P2601.2
Can a sink or toilet drain somewhere other than the sewer or septic system?
Can a sink or toilet drain somewhere other than the sewer or septic system?
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P2603.2
Pipes Through Structure Must Respect Framing Limits
P2603.2
Can I drill joists or studs for plumbing pipes?
Can I drill joists or studs for plumbing pipes?
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P2603.2.1
Piping Must Be Protected From Nails and Screws
P2603.2.1
Do I need nail plates where plumbing goes through studs?
Do I need nail plates where plumbing goes through studs?
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P2603.3
Piping Must Be Protected From Corrosion, Stress, and Strain
P2603.3
Can plumbing pipes touch metal framing, concrete, or other materials?
Can plumbing pipes touch metal framing, concrete, or other materials?
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P2603.4
Pipes Through Concrete and Masonry Need Sleeves or Protection
P2603.4
Do plumbing pipes need sleeves through concrete slabs or foundation walls?
Do plumbing pipes need sleeves through concrete slabs or foundation walls?
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P2603.5
Plumbing Piping Must Be Protected From Freezing
P2603.5
Can I run water pipes in an exterior wall or unheated crawl space?
Can I run water pipes in an exterior wall or unheated crawl space?
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P2604.1
Underground Plumbing Needs Proper Trenching and Backfill
P2604.1
Can I backfill around plumbing pipe with rocks or construction debris?
Can I backfill around plumbing pipe with rocks or construction debris?
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P2605.1
Plumbing Piping Must Be Supported at Code Intervals
P2605.1
How often do plumbing pipes need support straps?
How often do plumbing pipes need support straps?
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P2606.1
Plumbing Penetrations Through Roofs and Walls Must Be Sealed
P2606.1
How should plumbing pipes through roofs or exterior walls be sealed?
How should plumbing pipes through roofs or exterior walls be sealed?
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P2608.1
Prohibited Fittings Cannot Be Used Just Because They Fit
P2608.1
Are S-traps, flexible drains, or sanitary tees on their back allowed?
Are S-traps, flexible drains, or sanitary tees on their back allowed?
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