Choosing help to find the real source of a leak

Most people who spot a water stain on their ceiling call the first roofer who answers and ask them to "find and fix the leak." What they don't realise is that finding the actual source of a leak and identifying what's causing it are two entirely different jobs—and not every roofer approaches the detective work the same way.

A leak rarely enters the house where the stain appears. Water travels along beams, under membranes, and across cavities before it drips through. Someone who climbs onto your roof, spots a few cracked tiles or a loose flashing, fixes those, and calls it done may patch the symptom but miss the real problem. Six months later, the stain reappears somewhere else. Worse, you've paid twice.

Choosing someone to *diagnose* a leak properly is about finding someone methodical enough to trace the path water takes, not just spot obvious defects.

The difference between a quick look and a real investigation

A roofer doing a proper diagnosis will spend time on your roof in dry conditions first, examining the entire path water could travel from the highest point above your stain down to where it enters the house. They'll check not just tiles and flashing but also gutters, valleys, parapets, roof penetrations (where pipes and vents break through), and the condition of underlays and membranes. They'll ask about when the leak appears—only during heavy rain, or during light drizzle too? Does it happen when wind comes from a certain direction? These details matter because they narrow down where to look.

Some roofers will also suggest a water test: running a hose on the roof in sections to see exactly where water escapes the structure. This isn't guesswork; it's systematic. A roofer who resists this or dismisses it as unnecessary may not be thorough enough for a tricky leak.

During the diagnosis, they should walk you through what they've found and explain *why* water is entering at that point. If they can't explain the route water takes from roof to interior, they haven't really solved it yet.

What to look for in their approach

When you're comparing candidates, ask each one how they'll diagnose the leak before quoting any repair. Listen for:

• Do they visit in person and examine the roof in detail, or will they quote over the phone based on your description?
• Will they trace the leak back to its source, or focus only on visible damage?
• Can they explain common leak paths specific to your roof type (where water typically hides on a pitched roof versus a flat one, for instance)?
• Do they have experience with the particular age and construction style of your home?

A roofer who has spent years chasing leaks in Johannesburg's older properties, for example, will recognise patterns and common weak points that someone working mainly on new builds won't. Experience with your specific roof type—tile, IBR, thatch, flat membrane—also matters enormously, because water behaves differently on each.

The diagnosis should come before the quote

Insist on a clear diagnostic report or walkthrough before you get a repair quote. Some roofers combine diagnosis and quoting into one visit, which is fine, but make sure they've actually explained what they found and why. A good diagnostic costs a little (sometimes nothing if they're quoting the repair work anyway), and it's the cheapest insurance against paying to fix the wrong problem.

Once you have a clear picture of what's causing the leak, you can compare repair quotes confidently. Different roofers might propose different solutions to the same problem—some more invasive or expensive than others—but at least you'll all be solving the same issue.

When you're ready to get multiple diagnostics done, using a platform like Strove lets you filter roofers by their experience with leak detection and read what others say about how thoroughly they investigate. That way, you're more likely to find someone who sees the leak, not just the stain.