Are single-wall metal chimneys recommended for one- and two-family dwellings?

Single-wall metal chimneys are not recommended for one- and two-family dwellings due to safety concerns and the potential for fire hazards. These types of chimneys do not provide adequate insulation, which can lead to excessively high surface temperatures and increase the risk of ignition of nearby combustibles. Building codes generally walk a fine line between fire safety and material use, and single-wall chimneys typically fall short of the necessary standards for safe operation in residential settings.

In residential applications, especially in the case of one- and two-family homes, it is crucial to use venting systems that are designed to handle the exhaust temperatures of the appliances they serve, as well as to minimize heat transfer to adjoining structures. This is particularly addressed in local building codes that often require double-wall or insulated chimney systems. These requirements are put in place to ensure a safer living environment and to mitigate the risks associated with chimney fires.

Therefore, using single-wall metal chimneys is not advisable for these types of dwellings, making the assertion that they are not recommended correct. This aligns with the guidelines set forth in building codes and standards that prioritize safety in residential heating systems.