Pointing is the finishing operation that shapes and seals the mortar joints between bricks or stones, and it decides how long a masonry wall keeps water out. The mortar in the joints acts as a bed between units, and pointing re-dresses that bed where it has weathered, been raked out, or was never finished in the first place. Getting the profile and the mix right matters more than most builders expect, because the joints are the weakest path for rainwater into the wall.
The function of mortar goes beyond holding units together. Joints must let a wall breathe and drain, staying porous enough to release moisture while blocking bulk water. Mortar also has to be softer than the surrounding units so that movement and settlement crack the joint rather than the brick or stone. Pointing in brick and stone masonry restores that balance when the original finish fails.
What Is Pointing in Masonry?
Pointing work is the finishing of mortar joints in brick or stone construction. Freshly laid walls are often left with the joints raked out to a depth of 10 to 20 mm, and pointing fills those raked joints with a better quality mortar shaped into a chosen profile. Exposed joints are the weakest and most vulnerable points of a wall, which is why the finish has to shed water rather than trap it.
The Role of Mortar Joints
Mortar joints are the lungs of a wall: they let water inside the structure enter and exit freely. If moisture is forced to escape through the brick or stone itself, the units slowly disintegrate. Block the joints with an impermeable pointing mix and the wall traps water, then frost and salt do the damage from the inside.
Seven Standard Profiles
Masonry practice recognizes seven standard pointing profiles: keyed, cut, flush, recessed, beaded, tuck, and V-pointing. Each profile changes how water runs off the joint and how the finished wall reads from the street. Tuck pointing gets the most attention because its two-tone finish gives plain brickwork a crisp, ruled appearance.
Types of Pointing
The choice of profile depends on the exposure, the age of the building, and the look the client wants. Some profiles are chosen purely for weather resistance, while others are decorative.
Keyed Pointing
Keyed pointing presses a rounded steel rod into the soft mortar to form a continuous groove along the joint. The concave surface sheds water efficiently and is one of the most weather-resistant profiles available. It is a common choice for exposed brickwork and parapets where the joints take the brunt of the rain.
Flush Pointing
Flush pointing finishes the mortar level with the face of the units and is the most durable profile for walls fully exposed to weather. Because there is no ledge or recess, water runs straight off the surface, and the joints resist mechanical damage from ladders and impact.
Recessed Pointing
Recessed pointing sets the mortar back from the face by 5 mm or more, leaving the units standing proud. The shadow line looks strong on new brickwork, but the recess holds water, so the profile suits dry or sheltered elevations rather than exposed rain-facing walls.
Beaded, Struck, and V-Pointing
Beaded pointing forms a convex bead along the joint, struck pointing slopes the lower edge so water sheds outward, and V-pointing presses a V-shaped groove into the mortar. All three are decorative profiles used on facades where appearance leads and exposure is moderate.
| Profile | Joint shape | Water shedding | Typical use |
|---|---|---|---|
| Keyed | Concave groove | Excellent | Exposed brickwork, parapets |
| Flush | Flat, level with face | Very good | Fully exposed walls |
| Recessed | Set back from face | Poor | Sheltered elevations, interiors |
| Beaded | Convex bead | Moderate | Decorative facades |
| Struck | Sloped lower edge | Good | General external work |
| Tuck | Two-tone with raised line | Moderate | Ornamental brickwork |
| V-pointing | V-shaped groove | Moderate | Decorative panels |
Beginners often confuse pointing with the coatings applied to whole walls. The difference between plastering and pointing is coverage: plastering covers the entire surface with a render, while pointing works only inside the joints.
Mortar for Pointing Work
The mortar used for pointing must be softer and more porous than the units it protects, and it should be treated as a maintenance item that gets replaced, possibly every century, before the wall suffers. Matching the new mortar to the old wall is the single most important decision in the job, because restoring mortar joints with a mix that is too hard cracks the masonry instead of protecting it.
Lime Mortar
Lime mortar is the traditional pointing material and the right choice for most buildings erected before the 1920s. It stays soft and porous, breathes with the wall, and allows gentle movement without cracking the units. Lime pointing costs more to source and takes longer to cure than cement mixes.
Cement Mortar
Cement mortar is stronger, faster-setting, and cheaper than lime, which makes it the default for modern masonry. The strength of the mortar should always be less than that of the surrounding stones, so cement-rich mixes are reserved for hard, dense units and exposed parapets.
Ready-Mixed Mortar
Ready-mixed pointing mortars come in bags with controlled proportions and consistent colour, which helps on large contracts and long repointing runs. They still have to be matched to the wall: a mix that suits a modern house can destroy a soft brick wall built with lime.
Pointing Procedure and Surface Preparation
The quality of the finished joint depends almost entirely on the preparation. Pointing applied to dirty, damp, or loose joints fails within a season no matter how good the mortar is.
Raking Out and Cleaning
Joints are raked out to a depth of 10 to 20 mm, removing all loose mortar and dust. The surface is then brushed clean and dampened so the pointing mortar bonds instead of drying out instantly. Water should not be forced into the wall, only enough to control suction.
Mixing and Applying
Pointing mortar is mixed in small batches and used while it is still plastic. Each joint is filled in one pass, pressed well into the recess, and finished with the appropriate tool: a round rod for keyed pointing, a trowel edge for flush, a special iron for struck profiles.
Successful repointing projects start with matching mortar to the units: the colour, strength, and porosity of the new mix should follow the original, not the nearest bag on the yard.
Step-by-Step Pointing Sequence
- Rake out the joints to a depth of 10 to 20 mm and remove all loose material.
- Brush the joints clean and dampen the surface to control suction.
- Mix a small batch of pointing mortar to the matched strength and colour.
- Press the mortar into the joints in one pass and tool it to the chosen profile.
- Brush off excess mortar once it has firmed, before it stains the units.
- Protect the finished joints from sun, wind, and frost while they cure.
Curing the Finished Joints
Fresh pointing needs protection from sun, wind, and frost for several days. Light misting keeps the mortar from drying too fast, and covering the wall with hessian or polythene stabilizes the moisture content while the joints gain strength.
When to Repoint and Common Failures
Pointing does not last forever, and the mortar joints are designed to be the sacrificial part of the wall. Recognizing the signs of failure early avoids costly damage to the units themselves.
Signs That Pointing Has Failed
- Mortar crumbling or powdering at the face, especially on the weather side
- Cracks running along the joint line, which let bulk water into the wall
- Efflorescence staining below the joints, a sign that water is moving through the wall
- Loose or hollow joints that sound different when tapped
- Vegetation and moss growing in the joints, holding moisture against the mortar
Repair Planning
A chimney that has lost its joints to frost and rain shows the same failure pattern as a garden wall, only higher up and harder to reach. Crews planning a repair should assess the whole elevation: repointing a breast wall while the parapet above still leaks simply moves the problem.
When Not to Repoint
Repointing is not a cure for other construction failures. If gutters, roofs, or flashings are letting water into the wall, renewing the joints will not stop the ingress. Fix the source first, then repoint, or the new mortar will fail as fast as the old.
Understanding what is repointing and how the joints protect the wall turns a routine maintenance job into a structural decision. The right profile sheds water, the right mortar breathes with the masonry, and the right timing catches failures before the units themselves are lost. On older buildings, that sequence keeps the wall standing and the occupants dry for another century.