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Service water heating piping shall be thermally insulated in accordance with Table 606.4. Where hot water distribution piping is installed within attics and crawlspaces, the insulation shall continue to cover the pipe for a distance not less than 6 inches (152 mm) beyond the building thermal envelope. Where hot water distribution piping is installed within walls, the insulation shall completely surround the pipe with not less than 1 inch (25 mm) of insulation. Where hot water piping is installed in a wall cavity of insufficient size to accommodate the pipe and insulation levels of Table 606.4, the insulation thickness shall be permitted to have the maximum thickness that the wall cavity can accommodate, but not less than 1/2-inch (12 mm) thick.
Exception: Insulation is not required for the following:
  1. Factory-installed piping within service water heating equipment tested and rated in accordance with Section 606.4.
  2. Piping conveying fluids that is neither heated nor cooled, including cold water supply and natural gas piping.
  3. Hot water supply piping exposed under sinks, lavatories and similar fixtures.
  4. Hot water distribution piping buried within blown-in or sprayed roof/ceiling insulation, such as fiberglass or cellulose, where the insulation completely and continuously surrounds the pipe.
607.6.1 Buried Piping
Service hot water piping installed within a slab or below grade shall be insulated in accordance with Section 607.6 and shall be placed within a physically protective, waterproof channel or sleeve having internal dimensions large enough so that the piping and insulation can be removed and replaced, and maintain its dimensional integrity during and after construction.
Exception: For piping other than that located under building slabs, insulation is not required where the insulation manufacturer stipulates that the pipe insulation will maintain its insulating value in underground applications in damp soil where installed in accordance with the manufacturer's instructions.

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C404.1 [CE] Commercial Energy Efficiency, General
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C404.1 [CE] Commercial Energy Efficiency, General
This section covers the minimum efficiency of, and controls for, service water-heating equipment and insulation of service hot water piping ...