2015 UPC Code Update: Water Supply & Distribution: Pipe Insulation

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PHCC of California is proud to partner with IAPMO to provide code update information to the PHCC of California Membership.  We are proud to present updates from the 2015 Uniform Plumbing Code in accordance with our mission statement:

PHCC is dedicated to the promotion, advancement, education and training of the industry, for the protection of our environment and the health, safety and comfort of society.

February’s featured code change:

2015 UPC, Chapter 6
Water Supply and Distribution, Page 106
Section 609.11 Pipe Insulation

which reads as follows:

609.11 Pipe Insulation.  Insulation of domestic hot water piping shall be in accordance with Section 609.11.1 and Section 609.11.2.

609.11.1 Insulation Requirements.  Domestic hot water piping shall be insulated.

609.11.2 Pipe Insulation Wall Thickness.  Hot water pipe insulation shall have a minimum wall thickness of not less than the diameter of the pipe for a pipe up to 2 inches (50mm) in diameter.  Insulation wall thickness shall be not less than 2 inches (51mm) for a pipe of 2 inches (50mm) or more in diameter.


  1. Piping that penetrates framing members shall not be required to have pipe insulation for the distance of the framing penetration.
  2. Hot water piping between the fixture control valve or supply stop and the fixture or appliance shall not be required to be insulated.

This information has been reprinted with permission from IAPMO.