Why Expansion Joint Systems Fail by Unison Joints

Why Expansion Joint Systems Fail by Unison Joints.

A Designer, Manufacturer and Installers Perspective

Expansion joints are designed to move. Yet, too often, they fail. And it's rarely the product's fault.

Here's why:

1. Movement Underestimated Buildings expand, contract, creep, settle, sway. If a joint isn't designed for actual movement, seals tear, covers buckle, concrete edges crack.
2. Waterproofing Not Integrated Water is relentless. If membranes and joints aren't coordinated, leaks, corrosion, and internal damage follow.
3. Fire Rating Doesn't Match A joint is a break in the fire barrier. If the system isn't tested to match slab rating and accommodate full movement, compliance fails- and so does safety.
4. Wrong System for the Application Not all joints are the same. Carparks, hospitals, podium decks, seismic roofs- each requires a purpose-built solution.
5. Installation Mistakes

Even the best system fails if gaps are uneven, anchors are over-tightened, or fire components are compressed.

The Bottom Line:

Expansion joints are critical building systems, not minor details. Early coordination with structure, waterproofing, fire, and finishes ensures they perform for decades. Treat them as an afterthought, and you'll see failures. Treat them as a priority, and they protect your building and your reputation. Bernie Scott - MD Unison Joints has over 36 years of expansion joint design, manufacturing and installation.

Please be advised that Unison Joints is unaffected by COVID-19 as our manufacturing products are not sourced from China.