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305.4 Interval of Support
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Piping shall be supported at distances not exceeding the spacing specified in Table 305.4, or in accordance with MSS SP-69.
TABLE 305.4
PIPING SUPPORT SPACINGa
| PIPING MATERIAL | MAXIMUM HORIZONTAL SPACING (feet) | MAXIMUM VERTICAL SPACING (feet) |
| ABS pipe | 4 | 10c |
| Aluminum pipe and tubing | 10 | 15 |
| Brass pipe | 10 | 10 |
| Brass tubing, 11/4-inch diameter and smaller | 6 | 10 |
| Brass tubing, 11/2-inch diameter and larger | 10 | 10 |
| Cast-iron pipeb | 5 | 15 |
| Copper or copper-alloy pipe | 12 | 10 |
| Copper or copper-alloy tubing, 11/4-inch diameter and smaller | 6 | 10 |
| Copper or copper-alloy tubing, 11/2-inch diameter and larger | 10 | 10 |
| CPVC pipe or tubing, 1 inch and smaller | 3 | 10c |
| CPVC pipe or tubing, 11/4-inch and larger | 4 | 10c |
| Lead pipe | Continuous | 4 |
| PB pipe or tubing | 22/3 (32 inches) | 4 |
| PEX tubing | 22/3 (32 inches) | 10c |
| Polypropylene (PP) pipe or tubing, 1 inch or smaller | 22/3 (32 inches) | 10c |
| Polypropylene (PP) pipe or tubing, 11/4 inches or larger | 4 | 10c |
| PVC pipe | 4 | 10c |
| Steel tubing | 8 | 10 |
| Steel pipe | 12 | 15 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
- See Section 301.18.
- The maximum horizontal spacing of cast-iron pipe hangers shall be increased to 10 feet where 10-foot lengths of pipe are installed.
- Mid-story guide.
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