sprinklernotes
Using Joint Compound or Teflon Tape
You asked the following question: “When connecting sprinkler system components, if joint compound is used to make a connection, joint tape should not be used on the same connection, and vice versa, correct?” In response to your question, we have reviewed NFPA 13, 2016 edition as the applicable standard. Our informal interpretation is that the NFPA 13 prohibits both being used on the same joint. Section 6.5.1.3 states: Joint compound or tape shall be applied only to male threads. Since Section 6.5.1.3 states, “joint compound or tape” the usage of “or” implies either joint compound or tape can be used, not both. Otherwise, Section 6.5.1.3 would use “and/or.” This section also requires that whichever one is used it has to be applied to the male threads. The use of one or the other is a personal or company preference. However, it is also important to review the manufacturer’s installation requirements for the fittings to determine any limitations on the use of joint compound or tape. Note that some PVFC manufacturers indicate to use either paste or tape and explicitly state they must not be used together. This is because these fittings are not as robust as cast fittings so there are restrictions. Ultimately, the purpose of both Teflon tape and joint compound are to make up for the imperfections in the pipe and fitting threads to prevent leakage. Using both on the same joint is redundant as they both serve the same purpose.
