When you hire a masonry contractor to tuckpoint your home, the process matters as much as the price. Mortar installed correctly over properly prepared joints lasts decades. Mortar skim-coated over shallow cuts fails within a few winters. You cannot see the difference from the street the week the job is done. You see it in year three when joints are cracking again.
Here is what the process actually looks like, step by step, so you know what to expect and what to ask about.
Before the Crew Arrives: Assessment and Mortar Matching
The work begins before any grinding. An experienced contractor assesses the wall in person before quoting the job. What they are looking for is the extent of deteriorated mortar versus sound mortar, the original joint profile style, and the mortar composition.
Joint profile matters because the new mortar needs to match the existing profile - the cross-sectional shape of the joint at the face. Common profiles on Chicago-area homes include the concave joint, the flush joint, the raked joint, and the grapevine. Getting this wrong changes how the wall looks. More than that, some profiles are more durable than others in freeze-thaw conditions. Concave and V-shaped profiles shed water better than flush or raked joints that collect it. On Winnetka Georgians and Colonials, the original joint profile is often a grapevine or V-joint - an architecturally distinctive detail that standard concave tooling destroys. Winnetka’s housing stock is predominantly 1920s through 1940s construction, and the median home there was built in 1942. Matching the original joint profile on those walls requires knowing what you are looking at before grinding begins.
Mortar composition is the more critical assessment. The new mortar must be compatible with the existing brick in terms of compressive strength. Mortar must be softer than the brick it joins. This is the rule. Forcing a hard mortar like Type S, with a minimum compressive strength of 1,800 PSI per ASTM C270, against soft historic brick that was originally laid in lime mortar pushes freeze-thaw stress into the brick face rather than into the joint. Joints are designed to be the sacrificial element. They can be replaced. Brick faces, once spalled, cannot be put back.
For homes built before 1920 on the North Shore and in Evanston, where the brick is often soft and porous by modern standards, the mortar specification is almost always a lime-compatible mix - either a lime putty mortar, a hot-lime mortar, or at most a Type O formulation with a minimum compressive strength of 350 PSI. The Evanston greystone portfolio is the clearest example of what goes wrong when this rule is ignored: Indiana limestone facing over soft common brick, with many buildings carrying decades of prior Portland cement repairs that are now actively spalling the brick. Evanston’s median home was built in 1939, and the oldest residential stock there predates 1900. The first step on those projects is mortar assessment. On soft pre-1920 brick, the wrong mortar choice sets the next failure before work even begins. The type N versus type S mortar post covers the mortar selection framework in detail, and the lime versus Portland cement post explains why the distinction matters on historic masonry.
Color matching follows mortar selection. The mason looks at the existing mortar - the sound, undeteriorated portions that remain - and matches both hue and value. Mortar color comes from the sand aggregate, the cement and lime ratios, and any integral pigment added. A good match requires knowledge of local aggregate and the specific look of aged mortar. Pre-bagged mortar color mixes are a starting point, not a final answer.
Site Setup and Access
The crew arrives with ladders, possibly scaffold, or occasionally a man-lift for upper stories and chimneys. For a two-story house where tuckpointing is needed at the second-story level, pump-jack scaffold or sectional aluminum scaffold is typically set up along the affected elevation. For chimney work above the roofline, a lift is more practical than roof-mounted scaffold on most residential jobs. The scaffold versus boom lift post covers how contractors make the access decision on different home types.
Good crews protect the area below the work zone. Tarps catch mortar grinding dust and debris. Drop cloths protect plants and shrubs at the foundation.
On larger historic homes - the limestone and brick estates in Lake Forest or the substantial Colonials in Winnetka - full scaffold may be erected for the project duration. The 1938 Georgian Colonial near Sheridan Road in Winnetka we restored involved 280 linear feet of mortar joint restoration across two full elevations. Full scaffold ran on both sides so the crew could work continuously without moving equipment across finished garden plantings. Lake Forest estate-scale facades with limestone sills and lintels alongside brick follow the same pattern.
Grinding and Removing Deteriorated Mortar
This is the most critical stage of the job and the one where shortcuts are most tempting because labor is the constraint.
The standard is removal to a minimum depth of 3/4 inch, measured from the face of the brick. BIA Technical Note 7B and NPS Preservation Brief 2 both specify this minimum for proper repointing. The reason is straightforward: new mortar packed into a shallow cut does not have enough mass to bond correctly, cannot accommodate thermal movement, and is prone to cracking and delaminating from the remaining old mortar below it. The repair looks fine for a season and then fails.
Grinding is done with an angle grinder equipped with a tuckpointing blade. On brick that is not historic or soft, a standard 4-inch diamond blade at controlled depth is common. On historic soft brick, a more careful approach is required because the grinding wheel contacts the brick edges as it cuts along the joint, and an aggressive blade damages the brick arris - the sharp edge where the face of the brick meets the mortar joint. Damaged brick arrises are irreversible.
On the 1952 Evanston three-flat we tuckpointed - a four-story job covering the chimney and the full parapet wall - the brick is soft Chicago common, and every linear foot of joint removal on the chimney stack was done with a hand raking tool, not a grinder. The reason: the brick faces on that chimney were already stressed from decades of prior Portland cement exposure, and the grinder’s contact with those arrises would have caused face spalling that repointing cannot reverse. The job took longer. It needed to.
The alternative to grinding is hand raking with a manual mortar raking tool or a carbide-tipped oscillating tool attachment. Hand raking is slower but produces zero risk of brick edge damage. On historic masonry where brick condition is fragile, it is the correct approach even though it costs more labor time.
After grinding, the joint is blown clean with compressed air or vacuumed to remove all loose material. New mortar does not bond to dust and crumbled old mortar. This cleaning step is not optional.
Dust Control and Silica Safety During Tuckpointing
Grinding mortar joints generates respirable silica dust. Silica is a component of both mortar and brick, and fine particles created by cutting release crystalline silica that causes silicosis, a progressive and irreversible lung disease, with repeated exposure.
OSHA standard 29 CFR 1926.1153 governs silica exposure in construction. The permissible exposure limit is 50 micrograms per cubic meter as an 8-hour time-weighted average. The action level, at which specific control measures are required, is 25 micrograms per cubic meter. Grinding dry mortar without dust suppression substantially exceeds both thresholds in the breathing zone of the operator.
Compliant controls include HEPA-filtered grinding shrouds that capture dust at the source, wet grinding methods that suppress airborne particles, or a combination. Workers should wear half-face respirators with at minimum N95 filtration. P100 respirators provide better protection for sustained grinding work.
This is not merely a regulatory point. A crew that does not manage silica exposure on your property is putting their workers at serious health risk. Shortcuts on safety correlate with shortcuts on preparation depth and material selection. The silica dust masonry safety post covers the full compliance picture if you want to understand what to look for before hiring.
Mixing Mortar to Match Type and Color
After the joints are cleaned and cleared, mortar mixing begins. For site-mixed mortar, the mason measures the proportions of Portland cement, lime, and sand by volume. The ratios define the mortar type. A Type N mortar, standard for above-grade residential tuckpointing, uses a proportioning of 1 part Portland cement to 1 part lime to 6 parts sand. This produces a mortar with a minimum compressive strength of 750 PSI per ASTM C270 - soft enough to accommodate thermal movement and compatible with the hard machine-pressed brick used in post-war Northbrook and Glenview construction. Northbrook’s median home was built in 1968; Glenview’s in 1965. Type N is the right choice for above-grade residential tuckpointing on those homes where joint flexibility matters more than maximum compressive strength.
On the Lake Forest 1964 ranch we repointed along the north and west faces - 160 linear feet of deteriorated joints in lime mortar per the original specification - the mixing process involved blending and testing three aggregate samples before arriving at a match that would disappear into the aged buff-toned mortar still intact on the south and east faces. Lime mortar color matching is more demanding than Portland-based matching because lime continues to carbonate and shift color for months after application. You are matching a moving target, and the only way to get it right is to test and cure a sample before committing to a full elevation.
Pre-mixed bagged mortar is commonly used on residential jobs and is acceptable when the product specification is correct. The bag should specify the mortar type and the color designation. The mason adds water to the specified consistency - mortar should be workable but not soupy, holding a peak when troweled but not crumbling.
The dry mix color is not the wet mix color, which is not the cured color. Mortar darkens when wet and lightens as it cures. An experienced mason judges the dry mix against the cured mortar on the wall - not the wet mix. Pre-testing on a small inconspicuous area before proceeding on prominent elevations is good practice on any historic wall.
Packing Joints in Layers and Tooling the Profile
Fresh mortar is packed into the prepared joint in layers when the joint is deep. Packing the full depth in one pass is not correct practice for joints deeper than about 3/8 inch. The first layer is packed in and allowed to reach a leather-hard consistency before the second layer goes in. This staged application reduces the risk of shrinkage cracking and ensures the full joint depth is properly consolidated.
The mason uses a tuck pointer - a narrow flat trowel - to push mortar firmly into the joint without air pockets or voids. Voids in mortar joints are entry points for water. The joint should be consistently packed from the back of the cut to the face.
Once the joint is filled to slightly proud of the face, the tooling step shapes the final profile. The chosen profile should match the original joint style. A jointing tool rolled along the joint as the mortar stiffens to the right consistency creates the concave or other profile. The timing matters: too wet and the profile will not hold; too stiff and the tool will pull mortar out of the joint rather than compress it. The correct consistency leaves a slight sheen on the tooled face and a clean profile edge.
Tooling is not decorative. Compressing the mortar surface during tooling densifies the face of the joint and improves water resistance. A well-tooled joint sheds water. A sloppy or skipped tooling pass leaves a rougher, more porous joint face. The mortar joint profiles post explains why different profiles perform differently in freeze-thaw conditions.
Curing and Weather Protection
Mortar does not dry - it cures. The curing process is a chemical hydration reaction that requires water, not the absence of water. This distinction matters in practice.
Mortar left to bake in direct afternoon sun in July dries too rapidly. Rapid moisture loss before the hydration reaction is complete results in mortar that is weak, prone to shrinkage cracking, and susceptible to early failure. In dry or windy weather, experienced masons mist the freshly pointed joints during the first day or two of curing to maintain adequate moisture for the reaction to proceed.
Fresh mortar should be protected from rain for a minimum of 48 to 72 hours after application. Heavy rain within the first 24 hours can wash uncured mortar directly out of the joints. Contractors schedule around the forecast. If rain is expected within 24 hours, mortar work should not begin.
Temperature is the other constraint. Mortar curing requires sustained temperatures above 40 degrees F for a minimum of 5 to 7 days after application. In the fall window - September through mid-October in Illinois - this is typically achievable. The seasonal scheduling post covers the full calendar logic for tuckpointing timing in northern Illinois.
Do not cover fresh work with plastic sheeting in warm weather. Plastic traps heat and accelerates drying in the wrong direction. On hot dry days, damp burlap is a better option if the freshly pointed area must be shielded.
Cleanup and Final Inspection
A tuckpointing job is not finished when the last joint is tooled. Mortar smears on brick faces must be removed. Fresh smears wipe off easily with a damp sponge. Cured mortar smears require dilute muriatic acid cleaning, which must be done with proper dilution and rinsing to avoid etching the brick face. Good crews clean as they go.
Mortar droppings at the wall base, on window sills, and on adjacent surfaces are swept and removed. If scaffold was erected, it is struck and the area is checked for any debris left behind.
A final walk is part of a professional job. The mason looks for missed joints, sections where the mortar fill was not packed fully, and any profile inconsistency. Addressing these before leaving is far simpler than returning for callbacks.
As a homeowner, run your thumb along the new joints - they should feel consistently firm without hollow spots. Look at the profile from several angles for consistency. New mortar will appear lighter than aged mortar for several weeks while it cures. This is normal and expected.
How Long a Job Takes and What It Costs
Duration varies by scope and access more than by crew size.
A single elevation of a typical two-story North Shore home - roughly 30 linear feet wide and 18 to 20 feet tall - involving partial repointing of deteriorated joints might take a crew of two or three a full day. A full perimeter tuckpointing of the same home is typically two to four days.
A chimney can be a half-day project for minor joint repair or a full day when the crown needs work alongside the joints. Chimney tuckpointing on all four sides runs $800 to $2,500 in the Chicagoland market depending on chimney size, height, access requirements, and the extent of joint deterioration. That range reflects the difference between a straightforward single-flue chimney on a ranch with easy ladder access versus a tall multi-flue chimney on a two-story home that requires a lift and a full-day crew.
Tuckpointing is priced at $8 to $25 per linear foot depending on joint depth, mortar type, access difficulty, and brick condition. A full-facade tuckpointing project on an average home runs $1,500 to $4,500. Written estimates require an on-site assessment because scope - how much deteriorated mortar needs removal versus how much sound mortar can stay - varies enormously between properties. The Winnetka 1938 Georgian with 280 linear feet of joint restoration is a different project than a Glenview 1974 ranch with 80 linear feet of isolated chimney work. The tuckpointing cost post covers the pricing variables in detail.
One scope complication worth naming: in Deerfield, steel lintel rust is a documented top problem on 1960s-1970s Colonials - corroded lintels push brick outward as rust expands. When a tuckpointing project includes lintel replacement, cost increases significantly. Lintel replacement plus brick reset runs $2,000 to $5,000. A contractor who quotes only tuckpointing on a wall with displaced brick above a window has not fully assessed the job.
What Separates a Good Crew from a Fast One
Speed is not the primary metric for tuckpointing quality. A fast crew that grinds to shallow depth, skips dust control, and tools profiles carelessly produces work that looks identical to quality work for one season. After the first Chicago winter - dozens of freeze-thaw cycles, water expansion stress at approximately 9 percent by volume in every joint - the shallow or poorly bonded work begins to show.
The indicators of a quality crew are observable before the job is done. Do they set a depth gauge on the grinder? Do they use dust suppression? Are they mixing mortar in batches that are used before stiffening, or letting large batches sit and be reworked? Are they tooling joints at the right consistency, or rushing the tool along still-wet mortar that will not hold a profile?
Ask your contractor about joint depth before they start. A confident, experienced mason answers immediately and specifically. “We remove to 3/4 inch minimum using a depth-controlled grinder” is an answer that signals process discipline. Vague answers or defensiveness about the question signal the opposite.
For guidance on contractor selection, the contractor selection post covers credentials, questions, and red flags. The DIY versus professional post is useful if you are weighing whether to attempt any of the work yourself.
Scheduling Your Tuckpointing Job
September is a good time to schedule. The second Illinois curing window - temperatures in the ideal 50 to 80 degree range - runs through mid-October most years. Booking pressure of peak summer has passed, and quality contractors typically have more availability than in May or June.
Delta - Masonry and Tuckpointing performs residential tuckpointing and repointing across Chicagoland’s North Shore and northwest suburbs since 1987. If you are in Evanston, Glenview, Deerfield, Arlington Heights, or Palatine, call (847) 713-1648 or contact us online to schedule an assessment. We walk the property before quoting so the estimate reflects the actual scope of work. The masonry repair service page covers the broader range of work that may be identified during that assessment.
Grinding to 3/4 inch and packing in layers is what separates a twenty-year repair from a five-year patch.