Joints in Concrete Slabs

An Overview of Concrete Joint Types

Where to Locate Joints in Concrete Slabs

Special Considerations for Installing Joints

Related Information:

Concrete is not a ductile material—it doesn't stretch or bend without breaking. That's both its greatest strength and greatest weakness. Its hardness and high compressive strength is why we use so much of it in construction. But concrete does move—it shrinks, it expands, and different parts of a building move in different ways. This is where joints come into play. Although many building elements are designed and built with joints, including walls and foundations, we'll limit this discussion to joints in concrete slabs. Here's an overview of the types of joints, their function, and tips for locating and installing joints.