Exposed Pipes and Surfaces [4.19.4]
To prevent burns, hot water pipes and drain pipes under lavatories must be insulated or otherwise configured to protect against contact. Exposed sharp or abrasive edges are prohibited. Foam or fiber insulation with protective overwrap on drain, hot water supply, and sharp edges or commercially available rigid pipe covers will satisfy this requirement. The P-trap may also be installed parallel to the wall so that it is located outside the knee/toe space. If an under-lavatory enclosure is used, the specified knee and toe clearances must be maintained.
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