A new crack in a wall has a way of catching your attention every time you walk past it. Is it something to worry about, or just the house settling in the way old plaster does? Homeowners ask us this constantly, and it’s a fair question, because the honest answer depends entirely on what the crack is actually doing, not just how it looks.
At TT Waterproofing, our crack inspection and advice service exists precisely for this reason. Before we recommend any repair, we assess the crack properly on site and give you a straight answer about what you’re dealing with.
Why Looks Can Be Deceiving
A hairline crack in plaster and a structural crack in a slab can sometimes look surprisingly similar to an untrained eye, especially in the early stages. That’s exactly why guessing from a photo or a quick glance rarely tells the full story. Our team has learned that the real diagnosis comes from a combination of factors observed together on site, not from any single visual clue.
What We Actually Look For on Site
When we inspect a crack, we’re building a picture from several details at once.
Width and consistency. A fine, even crack that stays the same width along its length behaves very differently to one that widens noticeably at one end or varies in thickness.
Direction and pattern. Cracks that run diagonally, step through brick joints, or appear in a stair pattern tend to point towards movement in the structure rather than surface shrinkage.
Location on the building. Where a crack sits, whether it’s isolated to plaster, tracking through a structural wall, or appearing near a slab edge, tells us a great deal about what’s driving it.
Whether it’s active or stable. This is often the most important factor. A crack that has stopped moving behaves very differently to one that’s still opening. We look for signs of ongoing movement rather than assuming a crack found today is a crack that appeared yesterday.
Testing for Movement
Where there’s genuine uncertainty, we don’t rely on a single site visit and a guess. Monitoring a crack over time is sometimes the only honest way to confirm whether it’s stable or still active, and we’ll explain clearly when that additional step is worthwhile rather than rushing straight to a repair recommendation.
Why an Honest Diagnosis Matters More Than a Quick Fix
It would be easy to recommend the same repair for every crack that comes through the door. It would also be the wrong approach. A hairline crack only needs sealing to keep water out. A structural crack needs to be opened, cleaned and properly injected or filled before it’s sealed, because treating it like a cosmetic issue means it will simply reopen. Getting this diagnosis right the first time is what separates a repair that lasts from one that needs redoing within a year.
This is the same principle we apply across every job. We inspect thoroughly, tell you honestly what we’ve found, and only recommend the repair the situation genuinely calls for, whether that’s a straightforward seal or a more involved structural fix. It’s an approach that’s earned trust with homeowners, bodies corporate and businesses across Pretoria, Centurion and Midrand, and it’s part of why so many of them come to us as trusted waterproofing specialists whenever a new crack shows up.
Frequently Asked Questions
Can I tell if a crack is structural just by looking at it? Not reliably. Width, direction and location all give clues, but confirming whether a crack is stable or still moving usually needs a proper on-site inspection, and sometimes a period of monitoring.
Should I be worried about every crack I see? Not necessarily. Many wall cracks are cosmetic and simply need sealing to keep water out. The concern is when a crack keeps widening, follows a diagonal or stepped pattern, or appears alongside other signs of movement.
What happens after the inspection? You’ll get an honest assessment of what type of crack you have and a clear, itemised quote for the repair it actually needs, with no pressure to opt for anything more than that.
Noticed a new crack and not sure what it means? Contact TT Waterproofing to book a free, no-obligation on-site assessment, and we’ll tell you honestly what you’re dealing with.
