Plumbing Drain Systems
IRC Sections
General
P2601.2 |
Home must be connected to sanitary drainage system |
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P2603.2.1 |
Protection against damage |
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P2603.3.1 |
Penetrations |
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P2603.4 |
Pipes through foundation walls |
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P2603.5 |
Freezing |
General Installation Requirements
P2604.1 |
Trenching and bedding |
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P2604.2 |
Water service and sewer in same trench |
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P2604.3 |
Backfilling |
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P2604.4 |
Protection of footings |
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P2605.1 |
Supports |
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P2606.1 |
Sealing of annular spaces |
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P2607 |
Waterproofing of openings |
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P3008 |
Sewage backflow and backwater valve requirements |
Spacing Chart for Different Materials (spacing in feet)
Material Max Horizontal ft Max Vertical ft
PVC |
4 |
10 |
CPVC 1 inch or smaller |
3 |
10 |
PEX 1 inch or smaller |
2.67 |
4 |
PEX 1 ¼ inch or larger |
4 |
10 |
COPPER (1 ¼ inch or smaller) |
6 |
10 |
COPPER (1 ½ inch or larger) |
10 |
10 |
Drain pipe requirements
P3003.9.2 |
Purple primer not required on glued pipe (not pressurized) |
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P3003.13 |
Joints between different materials |
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P3005.1 |
Drainage fittings and connections |
Table |
P3003.2 |
Prohibited joint connections (no glued abs to pvc) |
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P3005.2 thru P3005.6 |
Clean out requirements (notes where required, direction changes and sizes |
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P3005.3 |
Required horizontal slope |
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P3005.4.2 |
Building drain and sewer size and slope |
table |
P3005.4 |
Drain pipe sizing |
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P3006 |
Sizing of drain pipe off sets |
Drainpipes for individual fixtures or sinks
P2706 |
Strainer/basket required for drain receptors |
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P2706.1.2 |
Standpipes (min 18” max 42”) |
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P2706.1.2.1 |
Washing machine standpipe (minimum 30 “) |
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P2706.2 |
Prohibited waste receptors |
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P2707.1 |
Directional fitting or tailpipe required for disposal or dishwasher |
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