The Most Important Waterproofing Principle: The 99%/1% Rule
- Joanna Fungo
- Oct 10
- 2 min read
When people think about waterproofing, they often imagine it’s just about putting a special coating or membrane on walls, roofs, or floors. But the truth is, waterproofing success is all about the details. Even a tiny gap can turn into a costly leak. This is where the 99%/1% Rule comes in.
What is the 99%/1% Rule?
Studies and industry experience show that 99% of water intrusion problems happen in just 1% of a building’s exterior. Surprising? It shouldn’t be. Water doesn’t usually come straight through big surfaces—it sneaks in through small, overlooked areas like:
Window and door edges
Roof-to-wall connections
Joints between different materials
Foundation transitions
Sealant or flashing that wasn’t done properly
These weak spots are where leaks almost always begin.
Why This Matters for You The Most Important Waterproofing Principle
Whether you’re a property manager handling large buildings or a homeowner protecting your investment, waterproofing isn’t just about choosing the right system.
For property managers: even one leak can mean tenant complaints, repair costs, and potential structural damage.
For homeowners: a single weak spot can lead to mold, cracks, and expensive fixes later on.
That’s why experts stress—the details make the difference.
The Role of Workmanship
Even the best materials won’t last if they’re installed carelessly. Waterproofing success depends heavily on workmanship and supervision:
Small mistakes during sealing or finishing can compromise the entire system.
DIY fixes often miss important connections or transitions.
Professional waterproofing ensures all systems tie together seamlessly.
In short: good products + bad installation = leaks.
Why Choose Everdry Waterproofing
At Everdry Waterproofing, we go beyond just applying products. Our mission is to deliver long-term, watertight protection for every property we handle. With over 20 years of proven experience, here’s what we promise:
✅ Every transition and joint is sealed with precision
✅ All systems are connected properly with expert detailing
✅ Strict quality checks throughout the project
✅ A team of highly trained professionals using the latest waterproofing methods
When you choose Everdry, you’re not just buying materials—you’re investing in experience, reliability, and workmanship that protect your property for years to come. The Most Important Waterproofing Principle
👉 Don’t let small gaps cause big problems.
📩 Inquire with Everdry Waterproofing today and secure your building with confidence.
📞 +63 969 224 8662 | +63 915 602 0011
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