BACKFEB 14, 2026
Discovering that the mortar in your foundation is crumbling or turning to powder can be an unnerving moment for any homeowner. It’s easy to imagine the worst-case scenario. But in most cases, this is a common and manageable issue that signals it’s time for some routine maintenance, not a structural emergency.
Looking for more guidance? Take a look at our Repairs overview.
Mortar is actually designed to be the sacrificial part of a masonry wall. It's softer than the brick or stone, so it absorbs the stress of expansion, contraction, and moisture over the years. Eventually, it breaks down so the harder, more expensive bricks or stones don't.
The key is to determine whether you’re looking at normal aging, which you can often repair yourself, or a sign of a more significant problem that needs a professional eye. This guide will walk you through how to inspect your foundation, understand what you’re seeing, and decide on the right course of action.
Before you pick up any tools, your first step is to perform a careful inspection to rule out serious structural issues. Some symptoms look like simple mortar decay but can point to deeper problems with how your foundation is bearing the weight of your home.
Stop and call a structural engineer immediately if you see:
If you see any of these signs, the crumbling mortar is a symptom, not the root cause. A professional evaluation is necessary to ensure the stability of your home.
If you don't see any of the alarming signs above, you can proceed with a closer inspection of the mortar itself. This will help you determine the scope of the repair.
What you’ll need:
Walk the entire perimeter of your foundation, shining the flashlight along the walls. Look for areas where the mortar is visibly receding, cracked, or missing.
Gently scrape a few of the affected mortar joints (the spaces between the bricks or stones) with your screwdriver. If the mortar flakes away easily or feels sandy and soft, it’s ready for repair. As you inspect, take clear photos of the damaged areas. Keeping a visual record in an app like Casa can help you track the condition of your foundation over time.
Based on your inspection, you'll know if you're dealing with a few small problem spots or a more widespread issue. This distinction determines your next steps.
Patching is a good option when:
Repointing is necessary when:
For isolated repairs, patching is a straightforward process. The most critical part is using the right type of mortar. Using a mortar mix that is harder than your original bricks can cause the bricks themselves to crack over time.
Tools for Patching:
Steps for a Patch Repair:
If your inspection revealed widespread deterioration, repointing the entire section is the correct long-term solution. This is a significantly larger undertaking. A professional mason has the experience to:
Seeing your foundation’s mortar begin to crumble is a normal part of your home’s lifecycle. By calmly inspecting the situation, you can distinguish between routine upkeep and a genuine cause for concern. A small patch job is a great way to build your DIY skills, while knowing when to call a professional for a larger repointing project is just as important.
Staying on top of your home’s needs is the best way to prevent small issues from becoming big problems. Download the Casa app today to keep track of your home’s maintenance schedule, store important notes and photos, and feel prepared for whatever your home needs next.
