Concave Joint
A concave joint is a specific way of finishing the mortar between bricks or stones in masonry work. It's like creating a small, curved inward groove in the mortar that connects building materials. This technique is very popular because it not only looks nice but also helps water run off the wall instead of sitting on the mortar, which makes the wall last longer. When you see this term on a resume, it shows that the mason knows how to create professional, weather-resistant finishes. This is one of several joint finishing styles, others including flush joints or weathered joints, and it's considered a standard skill for experienced masons.
Examples in Resumes
Expertly finished exterior brick walls using Concave Joint techniques for weather protection
Applied Concave Joint finishing on historical building restoration projects
Trained junior masons in proper Concave Joint and Concave Jointing methods
Typical job title: "Masons"
Also try searching for:
Where to Find Masons
Professional Organizations
Job Boards
Training Resources
Example Interview Questions
Senior Level Questions
Q: How do you determine when a concave joint is appropriate versus other joint types?
Expected Answer: A senior mason should explain that concave joints are best for exterior walls exposed to weather, discussing factors like local climate, wall exposure, and brick/stone type. They should mention its water-shedding properties and durability.
Q: How do you train others in proper concave joint techniques?
Expected Answer: Should describe teaching proper tool use, timing of joint finishing, consistency of pressure, and common mistakes to avoid. Should emphasize quality control and checking work.
Mid Level Questions
Q: What tools do you use for making concave joints, and how do you maintain them?
Expected Answer: Should mention jointing tools or slickers, explain how to keep them clean and rust-free, and discuss when to replace them. Should know proper tool sizes for different joint widths.
Q: What are common problems you might encounter when making concave joints?
Expected Answer: Should discuss issues like mortar being too wet or dry, timing problems, inconsistent pressure, and how to fix these issues. Should mention weather impact on joint finishing.
Junior Level Questions
Q: Can you describe the basic steps in making a concave joint?
Expected Answer: Should be able to explain waiting for mortar to set slightly, using the proper tool, applying even pressure, and cleaning excess mortar. Basic understanding of timing is important.
Q: Why are concave joints popular in exterior walls?
Expected Answer: Should explain that concave joints help water run off instead of sitting on the mortar, making the wall more weather-resistant and longer-lasting.
Experience Level Indicators
Junior (0-2 years)
- Basic joint finishing techniques
- Proper tool usage
- Understanding mortar consistency
- Basic wall cleaning methods
Mid (2-5 years)
- Multiple joint finishing styles
- Weather-appropriate techniques
- Quality control procedures
- Efficient work methods
Senior (5+ years)
- Training and supervision
- Complex restoration work
- Project planning
- Advanced finishing techniques
Red Flags to Watch For
- Unable to explain basic joint finishing techniques
- No knowledge of proper mortar consistency
- Lack of experience with different weather conditions
- Poor understanding of tool maintenance
- No awareness of safety practices
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