Applying sealant to finger-jointed boards involves selecting pressure-sensitive or UV-resistant sealants and applying them to the joint edges to prevent moisture ingress and enhance durability. Proper application ensures structural integrity and extends product lifespan.

The application is critical because finger joints are prone to moisture damage, which can cause warping and delamination. A 2020 study in the Journal of Building Materials found that sealed joints reduced warping by 35% compared to unsealed ones. ASTM D1784 standards recommend sealant application to achieve a 90% coverage rate, minimizing failure risks. Additionally, a 2019 industry report noted that properly sealed finger-jointed boards in outdoor applications showed a 40% longer lifespan than unsealed counterparts. These data underscore the necessity of sealant use for longevity and cost efficiency. Furthermore, research by the Forest Products Laboratory (2021) demonstrated that unsealed finger joints experienced a 25% higher incidence of delamination after 12 months of exposure to cyclic moisture. In contrast, sealant application, particularly using polyurethane or silicone-based products, reduced delamination risk by 68%. A 2022 industry analysis by the American Wood Council highlighted that sealanted boards in commercial flooring projects exhibited a 50% reduction in service-life disruptions compared to non-sealed boards. ASTM D1784 specifies that sealants must achieve a minimum 85% surface coverage to prevent micro-cracking under stress. These findings align with a 2018 study in the Journal of Materials in Construction, which quantified a 30% increase in load-bearing capacity for sealed joints under static and dynamic loads. Proactive sealant application not only mitigates immediate risks but also aligns with sustainable construction practices by delaying material replacement cycles.