Which factor can negatively influence air barrier performance during installation?

The performance of an air barrier system is highly sensitive to installation conditions. Wet conditions and improper adhesion can severely compromise the integrity and effectiveness of air barriers. When moisture is present during installation, it can weaken the bond between the air barrier material and the substrate, leading to potential gaps and failures in the barrier. Additionally, if the adhesive used to secure the air barrier does not set properly due to damp conditions, it cannot achieve the required airtight seal. This can result in air leakage, which undermines the whole purpose of the air barrier by allowing unwanted air exchange and potentially compromising energy efficiency.

Other options, while they may have their implications, do not have the same direct negative impact on installation as wet conditions and improper adhesion. Low humidity and high temperatures can actually facilitate some types of adhesion processes, high sunlight exposure typically concerns UV degradation over time rather than the installation process, and excessive insulation thickness does not pertain to the immediate performance of the air barrier during its application. Overall, the interaction between moisture and adhesion is critical, making the first option the most relevant in terms of installation challenges for air barriers.