Foundation Cracks: Types & When to Worry

Start with the crack pattern

Cracks can appear in concrete, concrete block, brick, or mortar joints. The material and direction help describe what you see. Building movement, moisture, soil pressure, and changes within brick or block construction can create different patterns.

A crack may run vertically, diagonally, or across a wall. In brick or block, it may follow the joints in a stair-step path. The shape is one clue. Its location, whether it is changing, and what the wall is doing nearby matter too.

Changes that deserve more attention

A crack deserves a closer look when it is changing, its two sides no longer line up, or the wall appears to bow or shift. Sticking doors, uneven floors, or new cracks elsewhere can point to a broader pattern.

If movement appears sudden, material is loose, or the area does not feel safe to approach, do not inspect it up close. Get professional guidance instead.

What you can document safely

Note where the crack begins and ends, what material it crosses, and whether it follows a joint. Take dated photos from the same safe position. Record recent rain, drainage trouble, or other changes you noticed around the same time.

If the crack is changing or the wall is moving, leave the material in place until it can be evaluated. A clear record is more useful than a quick guess about the cause.

Why an in-person look adds context

The soil, hidden side of the wall, and the wider base beneath it all affect how a foundation behaves. That wider base is called a footing; it spreads the building's weight into the ground. Similar-looking cracks can have different causes because these conditions vary from home to home.

Signs it is time for a closer look

Consider an in-person evaluation when a crack is new or changing, the wall has shifted, or several movement signs appear together. A professional can look at the crack along with the rest of the wall, drainage around the house, and signs of movement elsewhere.

What else are you seeing?

A line running across the wall has a different context from a crack that steps through brick or block joints. If doors stick, floors seem uneven, or cracks appear in several places, the broader foundation settlement signs may be more useful next.