Post-war brick home masonry in the Chicagoland suburbs is at a turning point. The homes built between 1945 and 1965, the ranch houses, split-levels, Cape Cods, and early colonials of the suburban expansion era, were constructed with hard machine-pressed brick that remains structurally sound on most properties today. The builder-grade mortar installed alongside that brick is a different matter. At 60 to 80 years old, it is at or past the end of its functional service life. The consequences range from water infiltration to structural brick displacement.
This is not a crisis on every block. It is a predictable maintenance window that arrives for every home from this era, and it is here now for most of them.
The Post-War Building Boom and What It Produced
From 1945 through the early 1960s, the Chicagoland suburbs expanded at a pace that had no precedent in American residential history. Veterans returned, families formed, incomes grew, and the automobile made outlying land accessible. Cook and Lake county farmland became residential subdivision at a rate measured in thousands of homes per year.
The builders working this boom needed consistent, available, and fast-to-lay masonry material. Hard machine-pressed brick, fired in large industrial kilns to a uniform density and size, was the answer. It differed significantly from the soft Chicago common brick of the pre-war era. Pre-war brick was fired from local clay deposits at lower temperatures, producing a more porous, variable material that required flexible lime-based mortar to accommodate seasonal movement. Post-war machine-pressed brick was denser, harder, and more dimensionally consistent. It accepted Portland cement-based mortar that set faster and required less hand labor.
The home types that came out of this period were diverse. Ranch houses, the quintessential post-war form, were single-story with a horizontal profile, low rooflines, and attached garages. Split-levels offered more square footage on smaller lots by staggering floor levels. Cape Cods brought a pre-war form into the post-war era with dormered upper stories. Early colonials, two-story with symmetrical facades, arrived later in the period as buyers sought larger homes.
All of these types, despite their different forms, share the same underlying masonry system: hard machine-pressed brick over concrete block or frame, with production-grade Portland cement-based mortar in the joints. That shared material system is why the maintenance window is arriving for all of them at roughly the same time.
For owners of ranch houses specifically, the single-story form creates unique masonry vulnerabilities, particularly around chimneys and attached garages. See Mid-Century Ranch Brick Care for a focused treatment of ranch-specific masonry issues and the chimney as the most exposed element on those homes.
What Hard Machine-Pressed Brick Is and Why It Lasts
The brick on a post-war home is not going to fail in your lifetime if you take care of the mortar. That distinction matters.
Hard machine-pressed brick is manufactured under high pressure before firing, which produces a denser, less porous material than hand-formed or soft-fired brick. The face hardness is significantly higher than pre-war common brick. Water absorption is lower. Freeze-thaw resistance is better. These properties are documented in BIA Technical Note 3A on brick material properties. The brick on a 1955 split-level or a 1962 Cape Cod has useful service life measured in additional generations.
The correct mortar for this brick is Type S, carrying a minimum compressive strength of 1,800 PSI per ASTM C270. Type S is harder than the Type N or Type O lime-based mortars appropriate for soft pre-war brick. This matters because mortar must be matched to the hardness of the brick it contacts. A mortar that is too soft erodes faster than the surrounding material and leaves joints undersized. A mortar that is too hard, such as Portland cement mortar used on pre-war soft brick, traps moisture inside the brick and causes spalling.
On post-war hard brick, Type S is the correct match. The mistake to avoid is bringing the lime-mortar approach used for bungalow-era soft brick to a post-war split-level. The brick generations are different and they need different repair specifications. A professional assessment identifies which generation of brick is on your home before any mortar is specified. For mortar selection guidance by brick type and application, BIA Technical Note 8 covers the full decision framework.
To understand the full range of brick types and what generation your home likely has, see Brick Types Explained: Common, Face, Pressed, and Clinker.
For a clear comparison of how brick veneer construction differs from solid brick, relevant to understanding how post-war homes were built, see Solid Brick vs. Brick Veneer: What’s the Difference?.
Why Post-War Brick Home Mortar Fails at 60 to 80 Years
Production-grade mortar used during the 1945 to 1965 building boom was not inferior mortar by the standards of the time. It met the mixing specifications required and performed adequately for decades. The material is simply not permanent.
Under normal Northern Illinois climate conditions, with dozens of freeze-thaw cycles accumulating each winter, Portland cement-based mortar has a functional service life. Water expands approximately 9 percent by volume when it freezes. Mortar joints that admit even small amounts of moisture go through that expansion and contraction cycle repeatedly each winter. The mechanical stress is cumulative. Cohesion between mortar particles breaks down gradually. Joints begin to erode at the face, then crack internally, then lose effective depth.
For builder-grade mortar installed between 1945 and 1965, the end of that functional service life arrives at approximately 60 to 80 years. That range puts every home built in this era between roughly 1985 at the early end and the present day on the late end of when mortar maintenance is needed or overdue.
The Great Lakes Integrated Sciences and Assessments at the University of Michigan documents the Great Lakes region as one of the highest freeze-thaw frequency zones in North America. Homes in the Chicago area accumulate this cycling damage more aggressively than homes in milder climates, which is why deterioration here tracks toward the shorter end of the service life range.
For a direct answer to how long professionally installed tuckpointing lasts once the original mortar has been restored, see How Long Does Tuckpointing Last?.
Northbrook and Glenview: The North Suburban Pattern
The post-war building boom hit Cook County’s north suburbs as hard as anywhere in the metropolitan area. Northbrook and Glenview are textbook examples of this generation’s masonry condition today.
Northbrook’s median home was built in 1968. The village’s primary era is 1950s through 1980s. The documented housing stock is split-levels, ranches, and colonials, all constructed with hard machine-pressed brick. The top problem listed for the village: builder-grade mortar reaching end of service life. The description is precise: production-grade mortar from Northbrook’s 1960s through 1980s building boom that is now eroding, cracking, and losing its weather seal after 40 to 60 years. At the upper end of that range, you are at 80 years for the earliest homes in the village’s boom, which aligns exactly with the post-war era’s end-of-service window.
Glenview’s median home was built in 1965. That places the median Glenview home at the core of the post-war building boom and at 60 years of mortar age in 2025. The documented masonry challenges in Glenview include chimney flashing failure, which occurs when mortar deterioration above the flashing line allows water to bypass the metal and enter the roof structure, and settlement cracking on homes built in areas with variable soil conditions. Both are post-war era masonry problems: the chimney from aging mortar, the settlement cracking from the soil dynamics beneath a home built on rapidly converted suburban land.
What these two villages share is the same fundamental situation: a large stock of post-war brick homes, all carrying builder-grade mortar from the same era, all arriving at the same service-life threshold within a window of roughly 10 to 15 years. This is not coincidence. It is the natural consequence of a building boom that happened at one time.
Deerfield: Steel Lintels and the 1960s Colonial Problem
Deerfield illustrates a specific post-war masonry failure mode that goes beyond mortar erosion: steel lintel rust and brick displacement.
Deerfield’s primary era is the 1960s through 1980s. The housing stock is colonials, ranches, and split-levels with hard machine-pressed brick. The median home was built in 1970. The documented top problems include both builder-grade mortar failure on exposed facades and, critically, window and door lintel rust causing brick displacement.
Steel lintels are the horizontal structural members supporting the brick above each window and door opening. On a post-war home built in 1965, that steel lintel is now 60 years old. Steel corrodes when exposed to moisture over long periods. The corrosion products take up significantly more volume than the original metal. A lintel that has rusted significantly can expand enough to push the brick above it outward, cracking surrounding mortar and displacing brick courses.
Left unaddressed, displaced bricks create structural and water intrusion problems that go beyond the scope of standard tuckpointing. The lintel must be replaced before surrounding masonry can be properly restored. Lintel replacement with surrounding brick reset runs $2,000 to $5,000 per opening in the Chicagoland market.
The diagnostic signs to look for on any post-war home from this era: horizontal cracking in the mortar joint directly above a window or door opening, rust-brown staining on the brick below the lintel, or a visible bow in the brick courses spanning the opening. Any of these warrant a professional assessment before tuckpointing work is scheduled. Tuckpointing mortar around a lintel that is actively expanding from rust will fail quickly regardless of mortar quality.
Deerfield also documents chimney crown cracking as a top problem. Concrete chimney crowns on homes from this era were often poured thin without reinforcement. After 40 to 60-plus years of freeze-thaw cycling, these crowns crack and allow water directly into the chimney structure. A post-war home in Deerfield from 1965 or 1970 that has never had its chimney crown replaced is overdue for that assessment.
For the full picture on chimney crown and cap function, see Chimney Cap vs. Chimney Crown: What’s the Difference?.
Libertyville: The Inland Post-War Pattern Without Lake Influence
Libertyville sits inland, without the lake moderation that affects North Shore communities. The climate is standard Northern Illinois freeze-thaw cycling, which means the post-war masonry service-life timeline is governed entirely by temperature cycling and precipitation rather than the additional moisture stress of lake proximity.
Libertyville’s median home was built in 1976, slightly later than the core 1945 to 1965 post-war window, reflecting the village’s continued growth into the 1970s and 1980s. But a meaningful share of Libertyville’s housing stock falls within the post-war era. Homes from the late 1950s through mid-1960s carry the same builder-grade mortar timeline as their counterparts in Northbrook and Glenview.
The documented masonry challenges in Libertyville for homes in this age range are consistent with the post-war pattern: chimney deterioration on mid-century ranches and split-levels, foundation mortar erosion at grade level, and concrete damage from de-icing salt. The grade-level mortar erosion is worth noting separately. On a post-war home where the brick veneer or exposed brick foundation meets the soil grade, that transition zone is exposed to constant moisture: splash-back from rain on the soil, snow melt, and irrigation runoff. The lower courses of mortar at grade level typically deteriorate faster than mid-wall joints because of this persistent moisture contact. Inspecting the foundation transition on post-war homes should be part of any comprehensive masonry assessment.
De-icing salt is the other inland factor that accelerates post-war mortar deterioration. Salt splashed and spray-deposited from driveways and front walks interacts chemically with cementitious mortar, weakening cohesion from the inside. Combined with freeze-thaw cycling, salt-adjacent mortar joints on exposed lower courses fail faster than equivalent joints elsewhere on the same wall.
Arlington Heights and Buffalo Grove: The Northwest Suburban Version
The northwest suburbs saw the same post-war building boom that shaped Cook County’s north suburbs. Arlington Heights has a primary era of 1960s through 1990s with a median home built in 1972. Colonials and bi-levels from the 1960s and 1970s have chimneys past their mortar service life, with crowns poured without adequate reinforcement now cracking and admitting water. The pattern is the same as the north suburbs, one decade later.
Buffalo Grove’s median home was built in 1978. The mortar failure window for early 1980s homes lands in the present. Buffalo Grove’s clay-heavy soils create seasonal movement beneath foundations that stresses mortar joints from below, adding a layer beyond freeze-thaw cycling. A home here can have deteriorating above-grade joints from weather cycling and cracked foundation joints from soil movement at the same time. Chimney crown and cap deterioration is also a documented top problem: unreinforced crowns from the building boom are cracking after 40 to 50 years.
How to Read Your Home’s Masonry Condition Without a Professional
You cannot make final maintenance decisions from the driveway, but you can identify indicators that warrant an inspection.
North and west wall joints. If the mortar face is recessed 1/4 inch or more from the brick, it has lost material and is admitting water. A joint that crumbles with light finger pressure has lost cohesion.
Above window and door openings. Horizontal cracking in the mortar joint directly above an opening, rust-brown staining on brick below the lintel, or a visible outward bow in the brick courses above the window are lintel rust indicators. See the Deerfield section above for the full diagnostic.
The chimney. Crown cracking visible from the yard tells you water is entering from the top down. White efflorescence below the crown line tells you water has been moving through for more than one season.
The foundation transition at grade. Efflorescence or crumbling mortar at the lowest courses indicate persistent moisture contact. On inland homes without lake moderation, this zone is where salt splash and irrigation runoff concentrate.
These observations cannot tell you actual joint depth, mortar composition relative to brick hardness, or structural condition behind the wall face. That requires an on-site assessment.
For a systematic walkthrough of reading mortar weathering depth and diagnosing spalling stages, see What Causes Brick Spalling and How to Prevent It.
For guidance on reading structural crack patterns, see How to Read Cracks in a Brick Wall.
What Correct Restoration of Post-War Masonry Requires
Four discipline points determine whether tuckpointing on hard machine-pressed brick lasts 30 years or fails in five.
Joint removal depth. BIA Technical Note 7B specifies a minimum of 3/4 inch removal before new mortar is applied. This is the depth at which new mortar achieves a proper mechanical bond. Shallow grinding, a common shortcut, leaves a thin layer that cannot grip the brick and delaminates within a few winters.
Mortar specification. Type S mortar for post-war hard brick, with a minimum compressive strength of 1,800 PSI per ASTM C270. Type N or lime putty mortar is too soft for this brick generation. Joints will erode ahead of the surrounding material.
Lintel assessment first. On any home from this era, lintels must be assessed before tuckpointing is scheduled. Tuckpointing around an actively expanding, corroded lintel will fail prematurely regardless of mortar quality. Lintel replacement precedes mortar work where rust is present.
Chimney crown and flashing. Crown condition and flashing integrity must be checked during any chimney tuckpointing project. Mortar work alone on a chimney with a cracked crown is an incomplete repair.
For a complete process walkthrough, see What Happens During a Tuckpointing Job. For an overview of the service itself, see our tuckpointing service page.
For brick repair when lintel damage has displaced individual units, that service page covers section replacement alongside mortar work.
Scheduling Post-War Masonry Work: The Right Timing
Mortar requires ambient temperatures above approximately 40 degrees Fahrenheit to cure properly. For post-war homes from the 1945 to 1965 era: do not wait another winter if your inspection identifies significant joint erosion, lintel rust signs, or an unaddressed cracked chimney crown. Each winter cycle that water has consistent entry into failed joints accelerates deterioration. The first winter loosens adjacent mortar. The second attacks brick faces. The third may produce interior water damage.
Spring is the right moment to assess because winter damage is fully visible and the full installation season is ahead. If your post-war brick home has not had a masonry inspection in the last 10 years, schedule one. The homes from this era are at the point in their service life where the inspection is overdue.
For the specific maintenance requirements of single-story ranch houses from this era, including chimney priority and low-roofline vulnerabilities, see Mid-Century Ranch Brick Care.
Scheduling a Post-War Masonry Assessment
Delta - Masonry and Tuckpointing has worked on post-war brick homes across Northbrook, Deerfield, Glenview, and Libertyville since 1987. We know this generation of housing, what the builder-grade mortar of the 1945 to 1965 era looks like at 60 to 80 years, and how to restore it correctly.
Every assessment starts with a free on-site inspection. We read the mortar and brick, identify lintel conditions, assess chimney components, and give you a written scope with Chicagoland market pricing. No obligation. Call (847) 713-1648 or contact us online to schedule.
The brick on a 1950s ranch or split-level will outlast us all. The builder-grade mortar holding it together will not.