How to Install Tile Expansion Joints

Most tiles, such as ceramic, stone or porcelain expand and contract as a reaction to its environment. This could cause the tiles to crack and break. Expansion joints are also called movement joints or control joints are usually in unseen areas, such as under baseboards. It isn't necessary to place expansion joints over the entire floor; place them where it is subject to extreme temperatures or where movement is anticipated.

Difficulty: Moderately Challenging

Instructions

1. Clean away all the debris and dirt from edges of the tiles prior to adding an expansion joint. This will guarantee that the sealant will adhere to the tiles.

2. Check the manufacturer's directions. Some sealants require a primer prior to application.

3. Use flexible caulk instead of hard grout for cold joints. This will allow the tile to move without breaking.

4. Install a closed cell polyethylene filler after the caulk has dried to help protect the joints from moisture, and it bonds very well to the caulk.

5. Add a bond breaking tape at the bottom of the joint if there is no room the filler. This will keep the sealant from adhering to the substrate.

Tips & Warnings

• Expansion joints that are installed inside usually require a location of 24 to 36 feet on center.
• Expansion joints that are installed outside require a location of 8 to 12 feet on center.
• Check to make sure your sealant for a floor expansion joint is electrometric to ensure the proper hardness.
• If you have a 90-degree joint, you should use a sealant instead of hard grout.