What type of joints are considered the most common and watertight?

Concave joints are recognized as the most common and watertight type of mortar joint used in masonry construction. The design of a concave joint features a smooth, rounded shape that helps direct water away from the joint, preventing it from penetrating into the masonry. This curvature enables the joint to better resist the infiltration of moisture, which is crucial in maintaining the integrity and durability of the masonry structure.

The effectiveness of concave joints in shedding water makes them particularly advantageous in environments where moisture exposure is a concern. The interior angles created within the concave profile also contribute to its strength, helping to maintain the structural reliability of the wall or surface they are part of.

Other types of joints, while suitable for various aesthetic or structural considerations, do not provide the same level of water resistance. Flat joints, for instance, may allow water to sit on the surface rather than draining off, potentially leading to water-related issues over time. Vee joints, though also effective in some applications, do not channel water away as efficiently as concave joints. Raked joints can be visually appealing but often serve less effectively in preventing water intrusion. Thus, the choice of joint type greatly impacts the waterproofing and longevity of masonry structures, with concave joints standing out for