December 21, 2023
From the 2021 UPC Illustrated Training Manual, Chapter 11, STORM DRAINAGE
The 2021 Uniform Plumbing Code Illustrated Training Manual is available for purchase here.
1101.5 Expansion Joints Required. Expansion joints or sleeves shall be provided where warranted by temperature variations or physical conditions.
Expansion joints or sleeves must be installed to protect the storm water piping from expansion, contraction, and building movement (see Figure 1101.5). A typical location for the installation of an expansion joint is the connection between a roof drain body attached to a plywood decked roof and a vertical conductor. Movement of the wood roof and expansion of the piping would otherwise either damage the piping or damage the water-tight joint between the roof and the roof or overflow drain. Expansion joints are also frequently needed to compensate for expansion and contraction of conductors located in attic spaces that are subject to widely fluctuating temperatures during different times of the day.
(This is not to be considered the official position of IAPMO, nor is it an official interpretation of the Codes.)
IAPMO
IAPMO develops and publishes the Uniform Plumbing Code®, the most widely recognized code of practice used by the plumbing industry worldwide; Uniform Mechanical Code®; Uniform Swimming Pool, Spa and Hot Tub Code®; and Uniform Solar Energy, Hydronics and Geothermal Code™ — the only plumbing, mechanical, solar energy and swimming pool codes designated by ANSI as American National Standards — and the Water Efficiency Standard (WE-Stand)™. IAPMO works with government, contractors, labor force, and manufacturers to produce product standards, technical manuals, personnel certification/educational programs and additional resources in order to meet the ever-evolving demands of the industry in protecting public health and safety.
Last modified: December 21, 2023