Storm masonry damage is the category of masonry damage most likely to be covered by homeowners insurance, and also the category most likely to be under-documented by homeowners who do not know what to look for. After a windstorm, a hail event, or an ice storm with downed branches, the masonry on your home needs a systematic assessment - not a glance from the driveway.
This guide covers how to walk your property in the right order, what to look for on each element, how to document what you find, and what the distinction between covered sudden damage and gradual deterioration means for your insurance claim. Delta - Masonry and Tuckpointing has served Chicagoland’s North Shore and northwest suburbs since 1987 and handles storm masonry damage assessment and repair across the region.
Why Storm Masonry Damage Needs Its Own Assessment
After a storm, most homeowners think about their roof, their windows, and their gutters. Masonry is often the last thing they check - and sometimes it is not checked at all until water shows up inside the building weeks later.
Masonry storm damage works differently than roof damage. A missing shingle is visible. A cracked limestone coping or a slightly shifted chimney cap may not be visible from the ground, but it is letting water into the wall every time it rains. In a Chicago-area climate where dozens of freeze-thaw cycles follow each autumn storm season, a small breach opened by a storm in October becomes a widening problem through December, January, and February. By spring, what started as a cracked coping joint is a saturated wall section that needs significant repair. For a thorough understanding of how freeze-thaw cycles work on masonry through a Chicagoland winter, see our post on Illinois freeze-thaw damage to brick.
The other reason masonry needs its own assessment is insurance. Homeowners policies cover sudden, accidental damage from identifiable storm events. They do not cover gradual deterioration. The window for establishing that damage was storm-caused closes when the storm is no longer recent news. A masonry assessment completed within days of a storm - with photographs and a professional written assessment - is evidence that the damage was sudden. An assessment completed four months later is harder to connect to a specific event. For more on what insurance covers and how to document a claim, see our post on homeowners insurance and masonry repair.
The Post-Storm Assessment Order: Chimney First
The chimney is the starting point for every post-storm masonry assessment, for two reasons. First, it is the most exposed masonry element on any home - it stands above the roofline with no protection on any of its four faces. It receives full wind pressure, direct hail impact, and the full weight of any ice accumulation. Second, chimney damage has the largest immediate consequence of any masonry element: a displaced chimney cap or a storm-opened crown joint admits water directly into the flue, where it wets the liner, saturates the surrounding masonry, and can produce interior ceiling and wall damage within a single weather event.
Inspect the chimney from the ground using binoculars before doing anything else. You are looking for: the cap - is it still in place, or has it been displaced or cracked? The crown - is there fresh cracking visible, or has a section broken away? The brick - are any courses visibly shifted out of alignment? The flashing - has it been pulled away from the chimney face where it meets the roof? And the overall vertical alignment - is the chimney still plumb, or has it developed a lean?
What you can see from the ground is incomplete. A full assessment requires roof access to inspect the chimney from all four sides and from above, where crown condition and flashing continuity can be evaluated properly. That is the professional assessment you need. Your ground-level inspection determines urgency - whether you need someone there today or can schedule for the coming week.
For emergency situations where a chimney is visibly displaced, leaning, or has lost substantial brick, read our guide on emergency masonry repair for what to do immediately, including how to determine whether the fireplace is safe to use.
Parapet Walls, Copings, and Upper-Story Elements
After the chimney, move to the upper horizontal elements: parapet walls and their coping stones on flat or low-slope roof sections, bay window copings, and the cap stones on any wall that terminates at or above roofline.
Coping stones are among the most storm-vulnerable elements on a masonry building. They sit at the top of a wall, fully exposed, and rely on mortar joints that weather from the top surface. Wind can shift a coping stone that had deteriorated joints before the storm. Impact from wind-driven debris can crack a limestone or concrete coping. An ice storm can deposit enough weight on a coping to open joints that were marginal before the storm.
A shifted coping stone is not a cosmetic problem. The coping’s function is to prevent water from entering the top of the wall. BIA Technical Note 7B is explicit on the role of properly maintained cap joints in water-resistance: any cap joint that has opened is an unobstructed path for water to enter the wall core. A coping that has shifted or developed a cracked joint is an open water channel into the wall core. The consequences show up later - saturated masonry that freezes and spalls, interior wall staining, lintel rust from persistent moisture - not immediately. But the cause is traceable to the storm event if you document it now.
Check lintels and window surrounds on all elevations. Wind-driven debris at upper floors can impact elements that you would not think of as storm-exposed. Check for fresh cracks, shifted stone, and any mortar that has been knocked out of joints.
Walls, Steps, and Ground-Level Debris
At grade level, walk each elevation of the house and look for impact damage. Fallen branches are the primary storm threat to ground-level masonry, and the damage they cause can range from scratched brick faces to displaced sections of several courses.
Look at the ground before looking at the walls. Brick pieces, limestone fragments, mortar chunks, and chimney cap components on the ground tell you what fell and approximately where it fell from. A pile of mortar debris at the base of a chimney tells you that the chimney sustained impact or movement. Brick fragments at the base of a wall tell you that the wall above lost material. Photograph everything in place before picking it up - that debris is documentation.
On steps and stoops, check for fresh cracks, for treads that have shifted from their original position, and for any mortar that has been knocked out of the joints between treads. Step movement after a storm is usually caused by impact from falling debris, though a sudden freeze can also cause a step with a pre-existing water-filled crack to split.
Winnetka and Wilmette: High-Exposure Storm Profiles
Winnetka and Wilmette sit directly on Lake Michigan, a position that gives storms arriving from the northeast exceptional force and moisture content. Lake-effect dynamics mean these communities often receive heavier precipitation and stronger wind gusts than inland suburbs in the same weather system. Winnetka has direct Lake Michigan exposure on east-facing facades, with sustained northeast winds that drive moisture deep into mortar joints, and heavy lake-effect snowfall that accelerates freeze-thaw cycling. Wilmette’s high water table and lake-proximity humidity compound the damage from any storm that opens a breach in the masonry envelope.
For Winnetka and Wilmette homeowners, the post-storm assessment is not optional. These are among the highest-exposure masonry environments in the Chicago metropolitan area. A storm event that opens a joint in a Winnetka chimney or displaces a coping on a Wilmette Georgian creates a water entry path that will be exploited by the next twelve storms before spring.
The pre-war housing stock in both villages matters here. Winnetka homes from the 1920s through 1940s used soft Chicago common brick with lime-based mortar. Wilmette’s median home age runs to the late 1940s. The original mortar joints in both communities have been through decades of exposure. A storm does not create vulnerability from nothing in these villages; it exploits vulnerability that already existed. An element that held through forty previous winters may not hold through a forty-first if the mortar had already eroded to the point where a threshold was crossed.
Winnetka’s documented damage pattern includes prior Portland cement repairs on many homes that damaged the original soft brick by trapping moisture. When a storm drives moisture into that already-compromised system, the damage compounds. After any significant storm affecting Winnetka or Wilmette properties, check the east-facing facade carefully - that is where the exposure is highest and where storm damage to masonry is most likely to have occurred. For more on the long-term effects of winter storms in this zone, see our post on snow, ice, and salt as winter masonry threats.
Deerfield and Tree-Lined Suburbs: The Fallen-Branch Scenario
The most common storm masonry damage in Deerfield and similar tree-lined suburbs is not wind pressure on the building - it is direct impact from falling branches. Deerfield’s tree-lined streets, with homes built predominantly from the 1960s through 1980s, have mature trees whose canopy substantially overhangs residential masonry. A significant windstorm brings branches down.
A fallen branch can strike a chimney with enough force to crack the crown, displace the cap, shift upper courses of brick, or damage the flashing at the roof junction. It can strike a wall and crack or displace brick faces. On homes with Deerfield’s documented primary problem - steel lintels above windows that are already corroding after decades of moisture exposure - a branch impact at a window surround can accelerate lintel exposure and cause immediate brick displacement above the window opening.
The debris assessment is particularly important in tree-lined neighborhoods. A branch that has fallen against the house may still be partially in contact with the masonry, applying load and moisture against an already-stressed area. Before any masonry assessment, branches in contact with the building should be removed, with care not to further displace any masonry they may have shifted when they fell.
After branch removal, check each window and door surround for fresh cracks or shifted brick, especially if any branch showed signs of contact with the wall above those openings. The Deerfield pattern of lintel rust causing brick displacement is well established - a storm impact on a facade where lintel corrosion was already underway can trigger sudden brick displacement that looks like pure storm damage but has a structural pre-existing cause that needs to be addressed in the repair scope.
Documenting Storm Masonry Damage for Insurance
If storm masonry damage occurred during an identifiable weather event - a named storm, a documented wind event, a hail event with official records - it falls into the category of sudden, accidental damage that homeowners policies typically cover. The documentation sequence is specific.
Photograph the damage before touching, cleaning up, or making any temporary repairs. Date-stamped photos from the day of or the day after the storm establish the timing. Note the storm date and type in your written record. If you have weather service records for your area (the National Weather Service maintains historical data by location and date), print or screenshot the relevant storm data. If neighbors reported similar damage, note that.
Report the damage to your insurer before any repair work begins. Insurers need to inspect or have documentation of the pre-repair condition to process a claim. Emergency temporary measures - a tarp over an open chimney, a piece of plywood over a breach in a wall - are appropriate and do not void a claim if they are documented with photos before installation.
Gradual deterioration revealed by a storm is a different category. If a storm makes visible the fact that your mortar joints have been failing for years, the mortar failure is not covered. The storm did not cause it. The distinction matters: a chimney cap displaced by a falling branch is a storm claim; a chimney cap that cracked from freeze-thaw cycling and finally fell during a storm is not. Honest documentation of what condition the masonry was in before the storm - existing inspection reports, previous contractor assessments - helps establish the line between pre-existing deterioration and storm-caused sudden damage.
Flashing: The Masonry-Roof Junction and Storm Risk
One of the most consequential forms of storm damage to masonry is flashing failure at the chimney-to-roof junction, parapet-to-roof junction, and similar transition points. Flashing is the metal component that creates a watertight seal between the masonry and the roof surface. It relies on both mechanical attachment and mortar to remain in place.
High winds peel flashing. A wind event that causes no visible masonry damage can still pull step flashing, counter flashing, or reglet flashing away from the chimney face by enough to open a water path. This damage is invisible from the ground. It only becomes apparent when water staining appears on the ceiling or wall near the chimney, often after the second or third rain event following the storm.
If you had any evidence of chimney or wall moisture intrusion after the storm - damp drywall, ceiling staining, water smell near the fireplace - flashing failure is a primary suspect alongside mortar joint damage. For a complete explanation of how flashing fails and what the symptoms look like, see our post on chimney flashing leaks.
Getting a Professional Storm Damage Assessment
After you have completed the homeowner walkthrough described here, a professional masonry assessment is the necessary next step for anything beyond minor cosmetic surface damage. Ground-level inspection identifies what is visible. Roof-level inspection identifies the full condition of chimney crowns, caps, and flashing; parapet coping condition from above; and upper-story elements that cannot be seen from grade.
A written professional assessment is the documentation an insurance company needs to process a masonry claim. It establishes the scope of damage, identifies the probable cause, and provides the contractor’s professional assessment of what the repair requires.
For the full picture on what our masonry repair service covers, including storm damage, see that page. If you believe the damage may qualify for a claim, start with historic masonry restoration context if the home is pre-war; for post-war homes the standard brick repair and chimney repair scopes apply.
Delta - Masonry and Tuckpointing provides post-storm masonry assessments across Chicagoland’s North Shore and northwest suburbs, including Winnetka, Wilmette, Deerfield, and surrounding communities.
Call (847) 713-1648 to schedule a storm damage assessment. We provide written documentation of all findings, photograph the pre-repair condition, and work directly with homeowners on insurance claim support where the damage qualifies. Contact us online for non-urgent scheduling.
If you believe the damage may be a structural emergency, read our guide on emergency masonry repair first.
The debris on the ground is your first clue. Brick pieces tell you that brick fell. Mortar chunks tell you joints opened under stress. Limestone fragments tell you a horizontal element took impact. Start there and work backward to the source.