Mortar Joint Profiles Explained — Concave, V, Weathered, and Why the Shape of Your Joints Matters

Quick Answer

A mortar joint profile is the shape a mason tools into the mortar between brick once it has begun to set. The common profiles — concave, V, weathered, struck, flush, raked, beaded, and grapevine — are not just decorative. The shape decides how well the joint sheds water and how dense and durable its surface is. In Chicagoland's freeze-thaw climate, concave and V joints shed water best, while raked and struck joints look handsome but hold water and are riskier outdoors. And in any tuckpointing repair, matching the original profile is what makes the new work disappear into the wall.

Most homeowners never think about joint shape until a repair comes back looking wrong. Here is what is actually going on between your brick.

Why Joint Profile Matters

Tooling a joint does two things at once. It compresses the surface of the mortar, packing it tighter and making it denser and more weather-resistant than mortar left untouched. And it sets the geometry — whether water runs off the joint or sits on it. On a Chicago-area wall facing decades of rain, snow, and freeze-thaw cycling, both effects matter enormously. A well-tooled, well-shaped joint sheds water and lasts; a flat or recessed joint collects water that freezes, expands, and breaks the masonry down.

So the joint profile is simultaneously a waterproofing decision and an aesthetic one. The best profiles do both jobs well.

The Common Joint Profiles

Concave (the workhorse). Tooled with a rounded jointer into a smooth, shallow curve. It is the most common joint in residential masonry for good reason: the tooling compresses the surface, and the curve sheds water outward. Forgiving, durable, and water-resistant — the default for most Chicagoland walls.

V-joint. Tooled to a crisp V shape. It sheds water about as well as concave and throws a sharp shadow line that many people find more refined. Excellent water performance; slightly less forgiving of irregular brick.

Weathered (struck from below). Tooled at an angle so the joint slopes outward and downward, with the top of the joint recessed and the bottom flush. The slope sheds water well, which makes it a solid exterior choice — though it takes more skill to tool consistently.

Struck (struck from above). The opposite slope — recessed at the bottom, flush at top. It looks clean and creates a shadow line, but the slope forms a small ledge that catches water. Common on interior or sheltered work; less ideal on exposed exterior walls.

Flush. Mortar cut off even with the brick face, untooled. Simple and used for walls meant to be painted or coated, but because it is not compressed it is less weather-resistant than a tooled joint.

Raked. Mortar raked back to a uniform recessed depth, creating a strong shadow line and a crisp, modern look. Attractive — but the recess is a ledge that holds water and snow against the wall, a real liability in freeze-thaw country unless done with quality materials and kept maintained.

Beaded and grapevine. Decorative profiles — beaded raises a rounded bead of mortar, grapevine presses a thin groove into the joint. Mostly seen on historic and period buildings; restoration work matches them but they are rarely chosen new for exterior durability.

Which Profile Is Best for Chicagoland?

For exterior walls in our climate, the answer is almost always concave or V. Both are tooled, so the surface is dense and water-resistant, and both slope or curve so water sheds rather than sits. Weathered joints are also a good exterior performer when tooled well. The profiles to be cautious with outdoors are the ones with flat ledges or deep recesses — struck, raked, and beaded — because anything that holds water against masonry through a Chicago winter is asking for freeze-thaw damage.

This is also why a quality mason will often steer a homeowner toward concave even when they ask for the dramatic shadow line of a deep raked joint: the look is appealing, but on an exposed wall the water management has to win.

Why Profile Matching Makes or Breaks a Tuckpointing Repair

Here is where joint profile becomes a homeowner concern. When a wall is tuckpointed, the new mortar has to match the old in three ways: color, strength, and profile. People focus on color, but profile is just as visible. If your original wall has crisp V joints and the repair crew tools concave joints — or worse, leaves them flush and smeared — the repaired area stands out from across the street, even if the color is a perfect match.

A careful crew studies the existing profile and reproduces it, so the repointed section reads as part of the original wall. A rushed one tools whatever is fastest. This is one of the quiet differences between a tuckpointing job that looks invisible and one that looks like a patch.

The Bottom Line for Property Owners

You do not need to memorize seven joint profiles. You need to know three things. First, the shape of your joints affects how your wall handles water, not just how it looks. Second, for exterior walls in the Chicago area, concave and V profiles are the safe, durable defaults, and recessed or ledged profiles are riskier. Third, when you have tuckpointing done, insist that the crew match your existing profile — it is the difference between a repair that disappears and one you will notice every day.

Emerald Masonry LLC is a family-owned, licensed and insured masonry contractor serving Chicago and the Chicagoland suburbs with 40+ years of experience in tuckpointing, chimney repair, brick repair and replacement, lintel and parapet repair, foundation and limestone/sill repair, caulking, sealing, and commercial, residential, and historic masonry restoration. We match mortar color, strength, and profile so repointing blends into your wall. Free on-site estimates — call (708) 288-1696.

For related reading and services, see our tuckpointing and repointing, historic masonry restoration, and our guide to what 'repointing' actually means and mortar color matching in tuckpointing.

Frequently Asked Questions

What is the best mortar joint profile for a Chicago-area brick wall?

For exterior walls in our freeze-thaw climate, concave and V joints are the best choices. Both are tooled — compressed and shaped — which seals the mortar surface, and both slope so water runs off rather than sitting in the joint. Concave is the most common and forgiving; V joints shed water similarly and give a crisp shadow line.

Why does the mortar joint shape affect water resistance?

Two reasons. First, tooling the joint compresses the mortar surface, making it denser and more water-resistant than an untooled joint. Second, the shape decides where water goes — concave and V profiles slope outward so water sheds, while raked, struck, and beaded profiles create flat ledges or recesses that hold water against the wall, which then freezes and damages the masonry.

Does my tuckpointing repair need to match my existing joint profile?

Yes, if you want it to look right. The joint profile is a big part of what makes a wall read as original. A good tuckpointing crew matches the existing profile so the repair blends in; a careless one leaves a different shape that stands out even when the mortar color is close. We match both color and profile.

Are raked joints a bad idea outdoors?

They are riskier. Raked joints — where mortar is recessed to create a deep shadow line — look great, but the recess forms a ledge that holds water and snow against the brick. In a freeze-thaw climate that standing water is a liability. They can be done outdoors with good materials and maintenance, but concave or V profiles are the safer choice on exposed walls.

Get a Free Tuckpointing Estimate

If your mortar joints are eroding and you want a repair that matches your wall in color, strength, and profile, Emerald Masonry LLC can help. Request a free on-site estimate through our contact page or call (708) 288-1696 today.