Concrete shrinks and moves as it cures and responds to temperature, moisture, loading, and structural conditions. Saw-cut or formed control joints encourage cracking at planned locations. Construction joints separate concrete placements, while expansion or isolation joints permit movement between building elements. A surface crack may be stable, active, or associated with vertical displacement. Filling every joint with patching material does not prevent movement from transferring into the flooring. The project designer, flooring manufacturer, and preparation-system manufacturer should determine which joints may be treated and which must be honored through the finished floor.
Key considerations
- concrete control joints under flooring, commercial floor crack treatment, flooring over concrete joints
- concrete joints, floor cracks, commercial flooring
- crack resistance, movement accommodation, installation durability
- joint classification, crack evaluation, planned treatment