What is the maximum horizontal spacing recommended for supporting cast-iron pipe?

The maximum horizontal spacing recommended for supporting cast-iron pipe is 5 feet. This guideline is essential because proper support prevents sagging and potential damage to the pipe. Adequately spacing supports helps to maintain the structural integrity of the pipe over time, minimizing the risk of leaks or breaks that could occur from stress or excessive weight.

Supporting cast-iron pipes at the correct intervals ensures that they can withstand the weight of the pipe and any contents flowing through it, as well as other external loads that may be applied. By following the 5-foot spacing recommendation, installers can enhance the longevity and reliability of the plumbing system.