Why is it important to verify airtightness between units in a multi-unit building?

Verifying airtightness between units in a multi-unit building is crucial primarily to prevent the transfer of air, smells, and noise. When units are not adequately sealed, air can flow freely between them, leading to issues such as unpleasant odors from neighboring units infiltrating living spaces, unwanted noise disturbances affecting the comfort and privacy of residents, and potential allergens or contaminants spreading through the shared environment.

Furthermore, maintaining proper airtightness helps in maximizing the building's energy efficiency by reducing unwanted heat loss or gain, which can decrease heating and cooling costs for occupants. This control over the indoor environment is vital for ensuring a comfortable living experience.

Although enhancing property value, ensuring structural integrity, and complying with building codes are also important considerations in building design and construction, they are not the primary reasons for verifying airtightness specifically between units. The focus on air transfer issues directly impacts the quality of life for residents within a multi-unit dwelling, making it the most relevant reason for this practice.