Masonry Repair Products for Concrete Cracks and Spalls

The best filler for masonry cracks is a high-quality, flexible sealant designed for exterior use. Our WEATHERCAP® products are not fillers, but protective caps installed over the sealant. They shield the filler from UV rays and weather, accommodate building movement, and significantly extend the life of the repair, preventing the joint from failing again.

Repairing mortar joints effectively involves using a quality sealant and protecting it. WEATHERCAP® is designed for this exact purpose. It's a soft lead cap installed over new sealant in the joint. This system protects the sealant from environmental stress and building movement, providing a durable, long-lasting solution that prevents moisture penetration and further degradation of the mortar joint.

WEATHERCAP® prevents joint failure, a common source of new cracks. By protecting the underlying sealant from UV exposure and weather, and by flexibly accommodating building movement, it stops the sealant from tearing or pulling away. This maintains a weatherproof seal, preventing water from getting into the masonry and causing freeze-thaw damage that leads to cracks and spalls.

Yes, absolutely. While it's a premier product for historic restoration, WEATHERCAP® is also ideal for new construction. Installing it during the initial build provides superior, long-term protection for masonry joints from day one. This proactive approach extends the life of sealants, reduces future maintenance costs, and protects the building's envelope integrity for decades.

Type A caps have a flat profile and are designed for joints between masonry units on the same plane, such as the top joints of a coping or cross joints on a stone lintel. Type B caps have a 90-degree cove profile and are used for right-angle joints, like where a window sill meets a wall or a cornice joins a parapet.

Yes, WEATHERCAP® can be painted to match the surrounding masonry or architectural trim. However, many architects prefer its natural finish. The soft lead oxidizes quickly to a neutral, non-reflective grey that blends seamlessly with most stone and masonry, providing a discreet and permanent protective solution without the need for additional coatings.