Joint sealants are a standard component of commercial construction and ongoing building maintenance. They are intentionally installed at joints and transitions to accommodate normal movement between adjacent materials while maintaining continuity at the building envelope. When properly specified and installed, joint sealants function as a predictable interface that allows structures to respond to environmental and operational conditions without transferring stress into rigid assemblies.
All commercial buildings move. Concrete expands and contracts, structural frames deflect under load, and exterior materials respond differently to temperature and exposure. Joint sealants do not prevent this movement, they manage it. Their purpose is not structural correction or defect mitigation but controlled flexibility at predetermined locations. This distinction is important because joint sealants are a planned system, not a reactive solution.
In new construction, joint sealants are installed as part of the original design. Their locations are defined in the construction documents, typically at expansion joints, material transitions, perimeter conditions and interfaces between dissimilar systems. Sealant selection is driven by joint movement, exposure and substrate compatibility and is generally dictated by the project specifications and manufacturer technical data. Proper joint size, surface preparation and installation sequencing are essential to achieving consistent results.
Over time, all sealant systems experience normal aging. Exposure, movement and environmental conditions gradually reduce elasticity and adhesion. This process is expected and does not imply construction failure. For this reason, joint sealants are typically treated as a maintainable component of the building rather than a permanent installation. Buildings that perform well over decades do so because maintenance is anticipated and addressed methodically.
Remedial joint sealant work on existing structures involves removing and replacing sealants that have reached the end of their functional service life. This work is most effective when approached as a planned maintenance activity rather than a reaction to visible deterioration. Evaluations are performed to identify joints that no longer perform as intended and replacement is limited to those areas.
The remedial process includes removal of existing sealant, cleaning and preparation of the joint surfaces, installation of appropriate backing materials and application of a new compatible sealant. Sealant selection is based on movement capability, exposure conditions and compatibility with surrounding materials. In high-exposure environments, long-term flexibility and UV resistance are prioritized. In both new construction and existing buildings, joint sealants serve the same fundamental purpose, accommodating movement in a controlled, intentional way.