Concave Joint

Definition

A concave joint is a mortar joint tooled into a curved, indented profile.

Purpose

The purpose of a concave joint is to create a weather-resistant seal in masonry work and to enhance the visual appeal of the brick or block surface. The curved profile helps shed water and resists the penetration of moisture.

Examples of Use

• Concave joints are commonly used in bricklaying to provide a durable and attractive finish.
• In masonry walls, concave joints help prevent water infiltration and improve the longevity of the structure.
• Historical restoration projects often use concave joints to match the original construction techniques and aesthetics.

Related Terms

• Flush Joint: A mortar joint that is even with the face of the masonry units.
• Raked Joint: A mortar joint where the mortar is recessed from the face of the masonry units.
• V-Joint: A mortar joint tooled into a V-shaped profile.

Notes

Proper tooling of concave joints is important to achieve the desired appearance and functionality. The joint should be smooth and evenly curved for maximum effectiveness.