What are breathable sealers and why are they important?

Breathable sealers are specialized coatings designed for masonry and concrete surfaces that provide water resistance while still allowing water vapor from within the substrate to pass outward. Unlike non-breathable sealers, which can trap moisture inside walls or masonry units, breathable formulas let underlying moisture escape, significantly reducing the risk of issues such as spalling, efflorescence, or freeze-thaw cracking.

This is especially important for commercial properties, historic buildings, and structures in New England, where buildings are exposed to regular freeze-thaw cycles, wind-driven rain, high humidity, and seasonal temperature swings. If moisture is trapped behind a non-breathable sealer during a New England winter, it can freeze and expand inside the masonry, leading to deterioration, surface flaking, or even structural concerns.

Breathable sealers are often used on brick, natural stone, concrete, mortar, EIFS, and stucco surfaces found in building facades, parking garages, plaza decks, and historic structures. They work by forming a microscopic barrier that repels liquid water from rain or snow, without interfering with the natural passage of water vapor. This function is crucial for maintaining the durability and appearance of masonry, particularly in older or historic assets where moisture movement is a vital preservation concern.

When considering breathable sealers for commercial, institutional, or historic properties, several factors impact product selection and performance. These include the age and type of masonry, past repairs or coatings, exposure conditions, and the ongoing maintenance plan. Proper surface preparation and professional installation are critical to ensure that sealers bond effectively and perform as intended over the long term.

Routine inspection and ongoing maintenance help identify when a new application may be needed, especially in the challenging weather conditions of Massachusetts and the broader New England region. By choosing quality breathable sealers and following best practices for installation and maintenance, property managers and building owners can protect their investment, minimize repair needs, and support the long-term structural integrity of their buildings.