Brick Veneer vs. Structural Brick: The Basics
Structural brick construction uses multiple wythes (layers) of brick as the actual load-bearing wall of the building. This was standard in urban construction through the late nineteenth and early twentieth century. The brick carried floor loads, roof loads, everything. These walls are thick — typically 8 to 12 inches or more — and the brick is the building.
Brick veneer is different. It's a single layer of decorative brick attached to the actual structural wall — wood framing, concrete block, or steel studs — with metal wall ties embedded in the mortar. The veneer carries no load. It's cladding, not structure. The Brick Industry Association defines veneer as a non-loadbearing exterior facing, and most residential construction built after 1945 uses exactly that.
If your house was built in the last 70 years and has brick on the outside, it's almost certainly veneer over frame construction. The transition from structural brick to brick veneer happened as wood-frame construction became the residential standard after World War II.
How to Confirm Which Type You Have
Look at the thickness of the brick at a window or door opening. The reveal — the depth of wall exposed between the outer face of the brick and the window glass — tells you a lot. If the brick is roughly 3.5 to 4 inches deep and you can see wood framing or drywall right behind it, that's veneer. If the wall is 8 inches or more of solid brick, you may have structural construction.
Age is also a good indicator. Pre-1930 urban construction is more likely to involve structural brick. Post-1950 residential is almost universally veneer. Homes from the 1930s and 1940s can go either way, especially in denser neighborhoods where older building traditions were still in use.
Common Crack Patterns in Brick Veneer
Brick veneer cracks in characteristic ways that differ from what you see in concrete or block foundations. Knowing the patterns helps you evaluate whether you're looking at normal veneer behavior or something that needs attention.
Stair-Step Cracks Through Mortar Joints
The diagonal pattern that follows mortar joints up and to one side is the most common crack type in brick veneer. It develops because the veneer expands and contracts with temperature at a different rate than the wood or block structure behind it. When the veneer can't accommodate that movement, it cracks at the weakest point: the mortar joint.
A stair-step crack that runs entirely through mortar rather than through the brick faces themselves is usually a sign of normal thermal movement. The Brick Industry Association's technical notes describe this as one of the most frequent maintenance issues in brick veneer, and note that it rarely indicates structural problems. Repointing the mortar — tuckpointing — is typically the appropriate repair, not foundation work.
Diagonal Cracks at Window and Door Corners
Diagonal cracks extending from the corners of windows and doors are extremely common in brick veneer. Openings create stress concentrations where movement focuses. When the veneer shifts slightly or the structure behind it moves, cracks tend to radiate from these corners.
In most cases these are cosmetic. An inch-long hairline crack at a window corner that's been stable for years is low priority. A crack that's 1/2 inch wide, has displacement (one side noticeably higher than the other), or has been growing over months warrants a closer look regardless of cause.
Horizontal Cracks and Outward Bulging
Horizontal cracks in brick veneer — especially if accompanied by the wall bowing outward — are more concerning than stair-step patterns. This can indicate that the metal wall ties connecting the veneer to the structural backing have corroded and failed. When ties fail, the veneer separates from the wall and becomes unstable. That's a masonry safety issue, not a foundation issue, but it needs to be addressed. A mason or structural engineer can assess tie failure.
When Veneer Cracks Point to a Real Foundation Problem
Brick veneer can register foundation movement. The veneer sits on the foundation or on a shelf angle connected to the structure, and when the foundation shifts, the veneer reflects it in the cracking pattern. The key is whether the cracking tells a coherent story about movement across the whole building.
Look for correlating symptoms. Exterior stair-step or diagonal cracks on one side of the house combined with sticking doors or windows on that same side, interior wall cracks following the same direction, or visible out-of-plumb conditions suggest the structure is actually moving. Exterior brick cracking with no interior symptoms, no door or window issues, and no foundation cracking below grade is almost always a veneer issue.
Displacement matters more than width. A 1/4-inch crack where one side is raised 1/8 inch above the other tells you there's differential movement. A 1/2-inch crack with perfectly even edges might just be old mortar deterioration. The International Residential Code requires foundations to limit differential settlement, and when displacement shows up clearly in a veneer crack pattern, the foundation is worth investigating by a structural engineer.
Which Professional to Call
This distinction matters practically. Masonry work is for a masonry contractor — tuckpointing, brick replacement, addressing failed wall ties. Foundation work is for a foundation company or structural engineer. Calling the wrong one wastes money and time, and calling a foundation company first for a veneer issue risks getting sold repairs you don't need.
When you're not sure whether the foundation is involved, hire an independent licensed structural engineer before calling any repair contractor. An engineer can assess both the veneer and the foundation structure and tell you definitively whether you have a maintenance issue or something requiring structural intervention. Fees typically run $300 to $500 for a residential evaluation — a reasonable investment before committing to major repair work.