Illinois winters are measurably hard on masonry. The Chicagoland area averages 80 to 100 freeze-thaw cycles per winter season - each one a small hydraulic event inside every brick, mortar joint, and concrete slab on your property. By the time temperatures stabilize in spring, the cumulative damage is done. What you find during your spring inspection determines whether you are scheduling a $400 repair or a $4,000 one.
This checklist is organized by structure, starting with the highest-risk elements. Work through it in order.
Why Spring Is the Inspection Window
There is a specific reason spring - and not fall - is the right time for a comprehensive masonry inspection.
In fall, you are looking at what winter might do to vulnerable areas. In spring, you are reading what winter already did. The damage is complete and visible. Efflorescence has appeared on walls where water cycled through. Spalling that was developing under the surface has progressed to visible face separation. Chimney crowns that cracked during freeze events have had months of water intrusion.
There is also a scheduling advantage. Spring and early summer offer the best temperature window for mortar work. Mortar requires sustained temperatures above 40 degrees F during cure - typically 5 to 7 days. In Illinois, that window opens reliably in April and stays stable through October. Identifying damage now means repairs can be scheduled during optimal curing conditions, before summer contractor demand peaks.
For a full explanation of how freeze-thaw cycles damage brick, see Why Brick Spalling Appears in Spring.
Section 1: Chimney Inspection
The chimney is the highest-priority structure on this checklist. It is the most exposed masonry element on your home, it sits above the roofline without any protection, and it cycles between extreme heat and ambient cold in ways no other masonry element does.
Crown Condition
From the ground with binoculars, look at the flat concrete or mortar cap at the very top of the chimney structure. You are looking for:
- Visible cracks - hairline or wider
- Missing sections or chunks that have broken off
- Separation between the crown and the flue liner collar
- Vegetation growing from the crown (roots exploit every crack)
A cracked crown allows water to enter the chimney from above and travel downward through every course of brick below it. This is covered in detail in Spring Chimney Crown Damage: The Winter Aftermath Homeowners Miss.
Mortar Joints
Scan the top 15 courses of brick carefully. Mortar at the crown level is exposed to the worst freeze-thaw conditions on the chimney. Look for:
- Recessed joints where mortar has shrunk back from the brick face
- Open gaps or missing mortar
- Crumbling or powdery mortar that has lost cohesion
- Horizontal cracks along individual joint lines
Efflorescence
White, powdery, or crystalline deposits on chimney brick are efflorescence - dissolved mineral salts deposited by water that moved through the masonry and evaporated at the surface. It tells you water is actively cycling through the chimney structure. Its location points to the entry point. For a full explanation of what efflorescence means, see Efflorescence and White Staining in Spring.
Lean and Displacement
Compare the chimney line to a vertical reference. Any visible lean away from the house warrants immediate professional assessment. Check also for gaps between the chimney and the house siding that are wider at the top than the bottom.
See 5 Signs Your Chimney Needs Immediate Repair for urgency levels on each of these conditions.
Section 2: Exterior Brick Walls
Mortar Joint Condition
Walk the perimeter of the house and examine all exposed mortar joints. Pay closest attention to:
- North-facing and east-facing elevations (more freeze cycles, less drying sun)
- Areas below window sills and above lintels where water concentrates
- Any elevation directly exposed to prevailing winter wind
Healthy mortar is flush with or slightly recessed from the brick face, intact, and firm. Deteriorated mortar is recessed more than 1/4 inch, crumbling, cracked along its length, or missing.
Run your fingers along joints in suspect areas. If mortar crumbles or comes out with light pressure, it needs tuckpointing this season.
Brick Face Condition
Look at individual brick faces for spalling - the separation and loss of the fired outer surface layer. Early-stage spalling appears as fine surface crazing or thin flaking. Later stages show concave depressions where the face has broken away entirely, exposing softer, lighter-colored interior material.
Spring is when spalling becomes most visible. Brick that absorbed water in fall and had that water freeze and expand through winter often shows new or progressed surface failure in March and April. For the full explanation of this timing, see Why Brick Spalling Appears in Spring.
Window and Door Perimeter
The masonry around window and door openings is subject to differential movement that concentrates stress at corners. Look for:
- Cracks radiating from window corners at 45-degree angles (stair-step crack pattern in brick, or diagonal cracks in the mortar)
- Gaps between the window frame and the surrounding brick
- Efflorescence below window sills where water drains from the frame onto the brick below
Lintels
Steel lintels carry the masonry load over window and door openings. When steel corrodes, it expands - often significantly more than the surrounding masonry. Look for horizontal cracking in the mortar joint directly above window and door openings, or spalling in the brick courses immediately above the lintel. Rust staining on the brick face below a lintel is a reliable indicator of corroding steel.
Section 3: Foundation and Below-Grade Masonry
Foundation Wall Cracks
Inspect the visible foundation perimeter. Distinguish between crack types:
- Vertical cracks: Often indicate differential settlement. Minor vertical cracks are common in older foundations; wide or active cracks (where one side is offset from the other) warrant assessment.
- Horizontal cracks: More serious. Indicate lateral soil pressure pushing against the wall. Horizontal cracks in a block or brick foundation are a structural concern.
- Stair-step cracks: Follow mortar joints diagonally. Common in brick and block foundations, indicating settlement or movement.
Mortar and Parging
If your foundation has a parging coat (a smooth mortar plaster applied to the exterior face), check it for cracks, delamination, or areas where it has detached from the substrate below. Damaged parging allows water to contact the foundation masonry directly.
Section 4: Concrete Flatwork
Driveways, walkways, stoops, and garage aprons take concentrated salt exposure through winter - both from de-icers you apply and from road salt tracked onto surfaces. Spring is when the damage from the previous winter’s salt application becomes fully apparent.
Look for:
- Scaling: The surface layer of the concrete has flaked away in irregular patches, revealing the aggregate below. Scaling is the most common form of de-icer salt damage.
- Spalling: Similar to brick spalling, but in concrete. Larger pieces of the surface breaking away.
- Cracking: Both from freeze-thaw pressure and from base movement beneath the slab.
- Joint deterioration: Control joints and expansion joints filled with failed caulk or missing material, allowing water to enter and undercut the slab.
For a detailed guide to identifying and evaluating concrete salt damage, see Spring Concrete Damage: How to Spot De-Icer Salt Failure.
Section 5: Wall Caps, Coping, and Parapet Details
Garden and Retaining Walls
Any freestanding or retaining wall has horizontal masonry surfaces on top - either a coping stone, a rowlock brick course, or a mortar cap. These horizontal surfaces collect water and are the most vulnerable points on any wall structure.
Check:
- Coping stone integrity - cracks, shifted stones, or missing sections
- Mortar at the cap line for cracking or open joints
- The face of the wall below the cap for efflorescence streaking
Parapet Walls
If your home has any parapet walls (masonry extending above the roofline), inspect the cap course and the flashing at the base of the parapet where it meets the roof surface. Parapet walls are exposed on three sides and are among the hardest-worked masonry elements on any structure.
When to Call a Professional
A ground-level visual inspection catches a large percentage of winter masonry damage. However, certain conditions warrant a professional assessment rather than a DIY determination:
- Any visible lean or displacement in a chimney or freestanding wall
- Horizontal foundation cracks
- Active water intrusion into the home anywhere near masonry
- Widespread efflorescence across multiple elevations (indicates systematic moisture infiltration, not an isolated joint failure)
- Mortar that is consistently crumbling or missing across a large area
Delta Masonry & Tuckpointing provides free masonry inspections across Chicago’s North Shore and Lake County. If you are in Winnetka, Wilmette, Glencoe, Lake Forest, or surrounding communities, call (847) 713-1648 or contact us online to schedule a spring inspection.
For timing guidance on when to schedule repairs, see When to Schedule Tuckpointing in Illinois: Why Spring and Early Summer Win.