Significant changes to bundled hot water piping insulation in the 2021 International Plumbing Code
A modification to Section 308.9 (Bundled Hot Water Piping Insulation) of the 2021 International Plumbing Code states that where hot water piping for a manifold system is in a bundle with cold water piping, the hot water piping is required to be insulated but not necessarily individually insulated.
The bundling of piping from manifold systems is often required very near the manifold. Individually insulating each hot water pipe (tube) in these bundles results in very large openings needed in framing members for the bundles to pass through. In those situations, the bundle of hot water piping can be insulated. The reference to Section 607.5 directs the code user to the requirements for pipe insulation.
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