ToolBase.org logo
The Home Building Industry's Technical Information Resource

Back to Standard View
Building SystemsHome Building TopicsDesign & Construction GuidesBest PracticesConstruction Methods
Adobe Acrobat Reader required for PDF documents

PDF documents require the free Adobe Reader.


All PDF documents open in a new browser window. Close the browser window to return to the site.

What is the difference between a control joint and an expansion joint in concrete construction?

Question:

What is the difference between a control joint and an expansion joint in concrete construction?

Answer:

A control joint is basically a groove cut into the surface of the concrete that allows some cracking to occur in the joint and not be readily visible. An expansion joint is between two separate pieces of concrete or between concrete and another material. The expansion joint allows a space for movement of the two pieces.