Horizontal PVC drainage pipe is supported using the ordinary tabular method of 2021 IPC Section 308.5, rather than an engineered expansion/contraction design under its exception. What is the maximum horizontal support spacing in Table 308.5?

Plumber exam practice question · Sanitary Drainage

Horizontal PVC drainage pipe is supported using the ordinary tabular method of 2021 IPC Section 308.5, rather than an engineered expansion/contraction design under its exception. What is the maximum horizontal support spacing in Table 308.5?

A6 feet
B10 feet
4 feet
D12 feet

Where to look it up

https://www.ncosfm.gov/b-1-2024-ncpc/open

Why C is correct

The PVC row gives 4 feet in the horizontal column. Its 10-foot vertical entry is a separate requirement. Section 308.5 permits an engineered-design interval for expansion/contraction systems; this question expressly uses the ordinary table. Footnote b concerns intermediate guides for specified vertical piping and does not change this horizontal value. See PDF pp.32-33. Source: 2021 IPC base text reproduced in the NC OSFM comparison document, https://www.ncosfm.gov/b-1-2024-ncpc/open

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Horizontal PVC drainage pipe is supported using the ordinary tabular method of 2021 IPC Section 308.5, rather than an engineered expansion/contraction design under its exception. What is the maximum horizontal support spacing in Table 308.5?

Horizontal PVC drainage pipe is supported using the ordinary tabular method of 2021 IPC Section 308.5, rather than an engineered expansion/contraction design under its exception. What is the maximum horizontal support spacing in Table 308.5?

More Sanitary Drainage questions