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Piping in exterior walls must be insulated, heated, or what other condition must apply?

  1. Placed at ground level

  2. Installed above grade

  3. Left open to air

  4. Both insulated and heated

The correct answer is: Both insulated and heated

In order to prevent freezing and potential damage to piping located in exterior walls, it is crucial that the pipes are either insulated, heated, or maintained under the condition that they are both insulated and heated. This is especially important in climates where temperatures often drop below freezing. Insulation helps to keep the heat from dissipating, while heating elements ensure that the pipes remain above freezing temperatures, thus protecting against the risk of ice formation within the pipes. The requirement for having both insulation and heating together provides an added layer of protection, ensuring that even if one method fails or is insufficient due to extreme temperatures, the other method can help mitigate the risk. This dual approach is necessary in areas where there is a significant risk of freeze damage, thereby supporting plumbing system integrity and functionality.