Masonry & Tuckpointing in Mount Prospect, Illinois

A 1969 village, by the Census numbers

Start with the number that sets the agenda. The Census Bureau's American Community Survey (2020-2024 five-year estimates) counts 22,526 housing units in Mount Prospect with a median year built of 1969: the middle house is 57 years old this year. Only 742 units, about 3.3 percent, date from 1939 or earlier. 15,837 units, 70.3 percent, went up between 1950 and 1979, almost evenly across the three decades.

These are survey estimates with margins of error, so read them as proportions. They still settle the question that matters on a masonry page: Mount Prospect is not a lime-mortar town. The National Park Service notes that by the 1930s most masons were mixing portland cement into mortar, so a wall built after 1950 sits in a portland-based mix. What comes due here is mid-century: water behind the brick, rusting steel, failed flashing and weathered chimneys.

Not all of it is houses: 12,817 units (56.9 percent) are detached single-family homes and 7,971 (35.4 percent) are in buildings of five or more units. So this page has two readers, a homeowner and a building manager.

No landmark commission, and no free-for-all

Many older suburbs have a historic commission that rules on front walls. Mount Prospect does not. The village's list of boards and commissions, and Chapter 5 of the Village Code that creates them, include a Planning and Zoning Commission and several other bodies but no historic preservation commission. A search of the whole code (current through Ordinance 6854 of July 7, 2026) for historic, landmark and preservation commission returned nine sections, all on small wireless facilities, signs and floodplain rules. None sets up a designation process or design review for exterior masonry.

Two caveats. The code changes often, so if your property is unusual, call the Building Division at (847) 870-5675 or permit@mountprospect.org. And a National Register listing would not change the picture: the National Park Service says federal law places no restrictions on what a non-federal owner does with a listed property.

The village's record of saving old buildings points the same way. The Mount Prospect Historical Society says its downtown museum came about after a bank's rezoning request, which would have razed the 1906 Friedrichs house, was denied. The Society calls that house typical of Midwestern frame farmhouses, so the best-documented survivor is a wood house. And the 1912 Busse Building at 2 West Busse Avenue, which the Society's own page calls the oldest brick building standing in the village, is listed as demolished in 2006.

Permits, licenses and the codes you will actually meet

The village adopted the 2021 International Building Code and 2021 International Residential Code, with local amendments, on February 15, 2022. Its rule of thumb: work that adds, moves or exposes water, gas, electricity or walls, or touches property lines, needs a permit. Section 21.203 of the code goes further, making it unlawful to begin any erection, construction, alteration or repair of a building before the permit is issued.

The residential fee table in Appendix A lists chimney repair as its own permit type, beside roof, exterior remodel and drainage. It does not list repointing by name, so put the tuckpointing question to the permit desk rather than taking a sales pitch's word.

A contractor's license is required for general contractors, electricians, plumbers, fire alarm, fire sprinkler, roofers and HVAC, and the village treats a company as a general contractor when it is the only contractor on a project. Masonry is not its own trade on that list, so ask the Building Division what applies to your job.

For anything touching the roofline, the village's Residential Roof Supplement says masonry flashings must be metal or lead and ice and water shield must run from the eave to at least 24 inches inside the exterior wall. The required-inspections list includes a masonry inspection after flashing and weep holes are finished. Inspections need 24 hours' notice (48 or more in construction season).

The property-maintenance layer

Permits govern work you start; the property-maintenance code governs the condition you leave. Section 21.603 adopts the 2021 International Property Maintenance Code: masonry joints weather resistant and water tight, exterior walls free of breaks and loose materials, roof and flashing sound and tight, decorative features anchored, chimneys structurally safe. The village added its own sentence: repairs to exterior surfaces must match, conform and be consistent with the existing exterior.

What fails in a 1950-1979 brick wall

The Brick Industry Association's Technical Note 46 (TN 46) is the plainest guide to how a mid-century wall deteriorates, and it starts with water.

Water first, mortar second

• Find the source first. TN 46 lists the usual culprits: unfilled joints, clogged or missing weeps, plant growth, torn sealant, damaged or missing flashing, differential movement, past acid cleaning or sandblasting. Persistent efflorescence, the white salt deposit, means water is still entering.
• Not every crack needs repointing. Veneer and cavity walls tolerate minor cracks. The note says repoint for mortar eroded more than a quarter inch, crumbling mortar, voids, hairline cracks and gaps between brick and mortar, found by eye and by scraping lightly with a metal tool.

Mortar: match it, never overpower it

After 1950 the right mortar is a modern portland-based mix, and the risk is the reverse of a Victorian house: too hard, not too soft. TN 46 says repointing mortar must be equal to or lower in compressive strength than the original, because stronger mortar concentrates stress at the brick face and can spall it. It calls Type N generally right for modern work and Type O the choice where cement content would be too strong. Old mortar should come out to at least twice the joint width, about three-quarters of an inch, and TN 46 warns that an excellent mason is not automatically a qualified repointer.

Steel, weeps and the parts that stick out

• Lintels. The Brick Industry Association's lintel note says harsh climates call for galvanized steel angles and that unprotected ones need maintenance to avoid corrosion. TN 46 treats accumulated rust as a structural warning, not a mortar defect.
• Weeps. Open, properly spaced weep holes let water out of a veneer wall. Clogged ones can be probed with a dowel or stiff wire without puncturing the flashing behind them.
• Sills, copings and chimneys take the hardest exposure and may need repair at shorter intervals than the wall.

When it is structural, not cosmetic

TN 46 sends these to a professional engineer, not a repointing quote: cracks wider than 0.075 inch (2 mm), cracks through several units, stair-step or diagonal cracks, widespread spalling, rust on lintels, out-of-plane movement and sills that slope the wrong way.

Chimneys: top to bottom, and what a sound repair covers

A chimney is among the most exposed masonry on the house: wind, rain from every side, nothing above it for shelter. With a median house 57 years old and 74.3 percent of occupied homes (16,054 of 21,600) on utility gas, both age and fuel matter.

The failure points, from the cap down

• Crown and cap. The 2021 residential code requires a concrete, metal or stone cap with a drip edge, sloped to shed water, and a caulked bond break around the flue liner. Technical Note 19B adds that the liner should stand two inches above the cap. A crown cracked from edge to flue lets water into the top courses every time it rains.
• Brick and joints above the roof. Look from the yard with binoculars for loose brick, sandy joints and spalled faces. At O'Hare the normal first autumn freeze is October 19 and the last spring freeze April 21, so water entering a joint in October faces up to six months of freezing nights.
• Flashing. TN 19B's sound detail: base flashing at least four inches up the chimney face and along the roof, counterflashing set three-quarters to one inch into a mortar joint and mortared in, lapping the base by at least three inches. The village wants masonry flashing in metal or lead. If a bead of surface caulk is all that holds yours on, that is the first question for a mason.
• Cricket. A chimney over 30 inches wide parallel to the ridge, and not on it, needs a flashed cricket (code section R1003.20).
• Flue liner. Masonry chimneys must be lined, with clay liner to ASTM C315, a listed lining system or another approved material suited to the connected appliance. Damage cannot be seen from the ground, so the inspection has to look inside the flue.

The gas appliance question

Three in four occupied homes here heat with utility gas, and an appliance is rarely replaced on the chimney's schedule. The code requires the flue lining to suit the appliance as listed and installed, and the flue may not be smaller than the connector. When a furnace or water heater is quoted, ask the installer how it will vent, and put the same question to your mason before either of them starts.

When to have it inspected

NFPA 211, as the Chimney Safety Institute of America quotes it, calls for chimneys, fireplaces and vents to be inspected at least once a year. Add a look after a storm, when you change appliance or fuel, around a sale, and whenever you see white deposits, rust streaks, leaning or loose brick, or ceiling stains near the chimney.

A sound repair scope, in order

• Written findings with photos of each side, and the water source named before anything is priced.
• Only failed parts rebuilt: cap first, then loose or spalled courses, with replacement brick judged in a sample panel.
• Joints repointed across the affected area in a mortar no stronger than what is there.
• Flashing and counterflashing reset to the detail above.
• Liner status stated, and a lining system proposed if it is not sound.
• Permit answered in writing: who pulls it and when inspections happen.
• A cold-weather plan for late-autumn work. The National Park Service says wall temperatures from 40 to 95 degrees Fahrenheit keep mortar from freezing or drying too fast.

Water, floodplain and the basement wall

The Metropolitan Water Reclamation District's page on Mount Prospect opens with April 2013: more than five inches of rain in 24 hours and many flooded homes. Storage added since in the Levee 37 drainage area, west of the Des Plaines River, includes a detention basin at Burning Bush Trails Park (completed 2021, up to 4.37 million gallons, relief for 32 structures) and a 17 acre-foot vault at Aspen Trails Park (completed 2022, more than 5.5 million gallons, about 100 structures).

The village code maps six watercourses, among them Weller Creek, Higgins Creek and the Des Plaines River. In a mapped flood hazard area, Chapter 22 treats repair of a building as development, sets a 50 percent of market value threshold for substantial improvement and excludes maintenance such as reroofing. Ask the Building Division which side your masonry job falls on.

If a block or brick basement wall has been wet, TN 46 is the checklist: efflorescence means water is still entering, and stair-step cracks, cracks through units or a bowing wall belong to an engineer, not a repointing bid.

If you look after a building, not a house

With 7,971 units in buildings of five or more units and nearly a third of occupied units rented, many decisions here belong to a board or a landlord. TN 46's advice for bigger walls: inspect every season, with binoculars for the upper floors, and keep dated records by elevation. Rental license holders have one seasonal rule: if after October 1 only exterior paint, roofing, exterior concrete and masonry violations remain, the director may, on written request, suspend enforcement fees until the following May 1, provided emergency roof repairs are done.

Questions that separate a real quote from a guess

• Can I see a sample panel? The National Park Service and the Brick Industry Association both recommend one, typically three feet square, to judge color and joint profile on your wall.
• Who grinds, and with what? The National Park Service warns that power saws on thin joints almost always damage brick edges, and that mechanical tools should never be used on vertical joints.
• Are repointing and brick replacement priced separately? The National Park Service recommends unit prices.

Questions Mount Prospect owners ask