Brick Repointing and Tuckpointing: Mortar Repair Technique
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Mortar joints are the sacrificial element in a brick wall. They are intentionally softer than the bricks so that when the wall moves with temperature changes, the mortar absorbs the stress rather than the bricks cracking. Over 20 to 50 years, mortar erodes from weather exposure, and the joints need repacking. This process, called repointing, extends the wall's useful life indefinitely if done with the right mortar and proper technique.
When Repointing Is Needed
The signs are visible from the ground. Mortar is recessed 1/4 inch or more behind the brick face. Mortar crumbles or feels sandy when scraped with a key or screwdriver. Mortar has fallen out of joints entirely, leaving open gaps. Water is entering the wall through joints, visible as damp patches on the interior wall or as efflorescence (white salt deposits on the exterior brick face).
Repoint when you first notice these signs, not after the wall is visibly failing. Waiting until joints are wide open allows water deep into the wall cavity, where freeze-thaw cycles crack the bricks themselves. At that point, you are replacing individual bricks at $5 to $15 each, not just repacking $0.50 worth of mortar. Early intervention is always cheaper than delayed repair.
A quick test: push the tip of a flathead screwdriver into a mortar joint with moderate pressure. If the mortar crumbles and you can dig out material easily, the joint needs repointing. Solid mortar that resists the screwdriver tip is still in good condition.
Mortar Matching
This is the most important step and the one most people get wrong. Modern mortar (Type N or Type S Portland cement mortar) is much harder than the lime-based mortar used in pre-1930 construction. Using hard mortar on soft old bricks traps moisture inside the brick. The moisture cannot escape through the harder mortar joints, so it migrates to the brick face and causes spalling, where the front surface of the brick pops off in sheets. The damage is permanent and expensive.
For buildings constructed before 1930: use a lime-based mortar mix (Type O or a custom lime/sand mix). Lime putty mortar stays soft and breathable, matching the original material properties. For buildings from 1930 to 1960: Type N mortar (a blend of Portland cement, lime, and sand) is usually appropriate. For buildings after 1960: Type N or Type S depending on the original specification and exposure conditions.
Color matching matters for the finished appearance. Take a small sample of the existing mortar (a piece the size of a quarter) to a masonry supply store. They can match the sand color and aggregate to produce a close visual match. Hardware store pre-mixed mortar in bags rarely matches existing joints because the sand color and texture differ from region to region. Quikrete and Sakrete both offer mortar mix in standard gray and buff, but custom-matched mortar from a masonry supplier produces significantly better results on visible walls.
Joint Raking (Removal)
Remove deteriorated mortar to a depth of at least 3/4 inch, which is roughly twice the joint width for standard 3/8-inch joints. This depth gives the new mortar enough surface area to bond properly to the sides of the bricks. Shallow repairs that pack a thin layer of new mortar over old, crumbling mortar fail within a year because the bond area is insufficient.
Three tools work for mortar removal. A grout rake (a hand tool with a carbide tip) is the safest option for delicate old brick. It is slow but gives you maximum control. A cold chisel and hand sledge work faster for harder mortar but require a steady hand to avoid chipping brick corners. An angle grinder with a 4-inch diamond tuckpointing blade is the fastest option for large areas, but it is aggressive and can cut into soft brick faces if your hand wavers. For your first repointing project, the grout rake or chisel is the safer choice.
Work carefully at brick edges. Chipping the corner off a brick is easy to do and impossible to undo cleanly. If a brick is already damaged beyond the mortar joint, note it for possible replacement before proceeding with the repointing.
After raking, brush out loose debris with a whisk broom or stiff brush. Rinse the joints with water from a spray bottle to remove dust. The joints should be damp but not soaking wet before applying new mortar. Damp surfaces prevent the old masonry from pulling moisture out of the fresh mortar mix too quickly, which weakens the bond.
Mixing and Applying Mortar
Mix mortar to a stiff but workable consistency. The mortar should hold its shape on a trowel when turned sideways without slumping. Too wet and the mortar shrinks and cracks as it dries. Too stiff and it will not bond to the joint walls. Getting the water ratio right takes a few test batches. Start with the manufacturer's recommended water amount and adjust by small additions.
Load mortar onto a hawk (a flat handheld board, roughly $10 to $15) and press it into the joints with a pointing trowel. Pack the horizontal (bed) joints first, then the vertical (head) joints. A pointing trowel with a 1/4-inch or 3/8-inch blade matches standard joint widths. Marshalltown and Kraft both make quality pointing trowels in the $12 to $20 range.
Work in thin layers if the joint is deep. Apply roughly 3/8 inch per layer and let each layer firm up for 15 to 20 minutes before adding the next. Packing a deep joint in one pass traps air and leaves voids that hold water. Multiple thin layers produce a denser, more durable repair.
Work in manageable sections. Mixed mortar is workable for about 90 minutes depending on temperature and humidity. On hot, dry days, that window shrinks to 45 to 60 minutes. Do not add water to mortar that has started to set (re-tempering). Re-tempered mortar has significantly reduced final strength and a crumbly texture.
Tooling the Joints
After the mortar firms up (30 to 60 minutes depending on conditions, when it resists a light thumb press without smearing), tool the joints to compress the surface and match the existing joint profile on the rest of the wall.
Common joint profiles include concave (the most common and most weather-resistant, pressed with a round jointing tool), flat or flush (scraped level with the brick face using the edge of a trowel), and raked (recessed with a flat surface, which looks sharp but holds water and is less durable in exposed locations). Match the profile to the surrounding joints for a consistent appearance.
Tool horizontal joints first, then vertical joints. Use a jointer that matches the joint width. A consistent tooling depth and pressure across all joints produces clean, professional-looking results. Inconsistent pressure creates a patchy appearance that makes new work obvious against old work.
Brush off excess mortar crumbs after tooling with a stiff bristle brush. Do this after the mortar is firm enough not to smear, typically an hour after tooling. Brushing too early drags mortar across the brick face and stains it. Waiting too long means the crumbs have hardened and require more effort to remove.
Curing
New mortar needs to cure slowly to reach its rated strength. Mist the repaired area lightly 2 to 3 times per day for the first 3 days. Cover with damp burlap or plastic sheeting if the weather is hot, dry, or windy. Rapid drying causes surface cracking and a weak bond to the brick.
Do not repoint in direct hot sun, freezing temperatures, or heavy rain. Ideal conditions are overcast skies, 50 to 80 degrees Fahrenheit, and moderate humidity. Temperature extremes during the first 72 hours weaken the mortar bond permanently. Check the weather forecast for the three days following your planned work.
Lime-based mortars cure much more slowly than Portland cement mortars. They carbonate over weeks rather than hydrating over days, meaning they take several weeks to reach full hardness. Keep lime mortar joints damp for at least a week and protect them from direct sun during that period.
Tools for Repointing
The basic tool list includes a grout rake or cold chisel and hand sledge for mortar removal, a pointing trowel with a narrow flat blade, a hawk for holding mixed mortar, jointing tools matched to your joint profile and width, a stiff bristle brush for cleanup, and a spray bottle or garden sprayer for misting during curing. Total cost for hand tools if you are starting from scratch: roughly $50 to $80.
For larger projects covering more than a few square feet: a mortar mixer ($25 to $40 for a manual paddle mixer, or rent an electric mixer for $40 to $60 per day) saves significant arm fatigue. For precise and fast mortar removal: an angle grinder with a 4-inch diamond tuckpointing blade ($15 to $30 for the blade), plus safety glasses and a dust mask rated for silica dust (an N95 at minimum, a P100 half-mask respirator for extended grinding). See our power washer guide for post-project cleanup of mortar residue on brick faces.
Frequently Asked Questions
How Long Does Repointing Last?
A properly done repointing job with the correct mortar type lasts 25 to 50 years. Repairs with mismatched mortar (too hard for the bricks, wrong composition) can fail in 5 to 10 years and may damage the bricks in the process. The key factor in longevity is mortar compatibility with the existing brick, not the skill of the application technique.
What Is the Difference Between Repointing and Tuckpointing?
In the US, the terms are often used interchangeably to mean replacing deteriorated mortar in joints. Technically, tuckpointing is a decorative technique where a thin line of contrasting-color mortar is applied over the joint to create the illusion of very fine, precise joints. What most homeowners need is repointing: removing the deteriorated structural mortar from the joints and replacing it with fresh mortar.
Can I Repoint a Whole House Myself?
Technically yes, but it is extremely labor-intensive. A professional mason repoints about 30 to 50 square feet of wall per day. A typical two-story house might have 1,500 or more square feet of exterior brick. That is 30 to 50 working days if doing it yourself. Most homeowners start one section, learn the technique, then hire a mason for the remaining walls. The skill you build on the first section is useful for ongoing maintenance repairs in future years.