For maximum weatherproofing, which joint profile is preferred?

For maximum weatherproofing, which joint profile is preferred?

• A. Concave joint
• B. Beaded joint
• C. Raked joint
• D. Flush joint

Answer: (A)

Waterproof performance in masonry joints comes from how well the profile sheds water and resists moisture wicking. The concave joint is formed by pressing the mortar into the joint to create a rounded, recessed surface, which makes water run off rather than cling to the joint. This curved shape also helps compact the mortar, sealing tiny cracks and reducing pathways for wind-driven rain to penetrate. Beaded joints leave a surface bead that can trap and direct water into the joint; flush joints sit flat with the masonry face and offer less drainage, making moisture easier to penetrate; raked joints are inset and can accumulate water in the groove, reducing protection against rain. So, for maximum weatherproofing, the concave profile is the best choice.

Waterproof performance in masonry joints comes from how well the profile sheds water and resists moisture wicking. The concave joint is formed by pressing the mortar into the joint to create a rounded, recessed surface, which makes water run off rather than cling to the joint. This curved shape also helps compact the mortar, sealing tiny cracks and reducing pathways for wind-driven rain to penetrate. Beaded joints leave a surface bead that can trap and direct water into the joint; flush joints sit flat with the masonry face and offer less drainage, making moisture easier to penetrate; raked joints are inset and can accumulate water in the groove, reducing protection against rain. So, for maximum weatherproofing, the concave profile is the best choice.