What role do sealants play in the building envelope?

Sealants are a vital component of every commercial building’s envelope system. Their primary purpose is to fill and protect the joints, seams, and transitions where different materials or building components meet, such as between masonry and window frames, expansion joints, control joints, and around penetrations. Without properly installed and maintained sealants, these areas become highly vulnerable to water infiltration, air leaks, and environmental stress, which can compromise the structural integrity and durability of the entire building.

In New England, commercial properties are regularly exposed to severe seasonal conditions, including freeze-thaw cycles, wind-driven rain, snow, ice, and the use of de-icing salts. Sealants must accommodate movement caused by temperature fluctuations and building settling, while resisting damage from moisture and UV exposure. When sealants fail or degrade due to age, weather, or improper installation, they allow water and air to penetrate the envelope. This can lead to issues such as corrosion of embedded steel, deterioration of masonry or concrete, energy loss, fungal growth, and interior water staining.

For commercial, institutional, and historic structures, maintaining high-performance sealant systems is essential for asset protection and long-term value. Modern commercial-grade sealants are engineered for flexibility, adhesion, and weather resistance, but even the best products require professional installation for maximum performance. Each application must be carefully selected based on material compatibility, expected joint movement, building use, and environmental exposure.

Regular inspection and proactive replacement of aging or damaged sealants should be included in preventative maintenance programs. A qualified evaluation can identify areas where joints have failed, gaps have formed, or existing materials are no longer effective. Addressing these issues promptly helps avoid more costly restoration needs or unexpected leaks that disrupt operations.

Ultimately, reliable sealant systems provide watertight protection, support building energy efficiency, and help preserve both modern and historic envelopes against New England’s challenging weather. Quality materials, skilled installation, and ongoing maintenance are key to ensuring the long-term protection of commercial buildings.