How to Caulk Expansion Joints

Caulks are glues that help to bind and fix joints together that are subject to expansion and contraction. They are effective on concrete, wood, glass and metal. Caulks are available in different colors to fit in nicely with the treated area. Follow these simple guidelines to easily caulk expansion joints.

Difficulty: Easy

Instructions

Things You'll Need:

• Caulking compound
• Brush and cloth
• Polyurethane foam/rod
• Caulking gun
• Trowel (optional)

1. Choose from a variety of caulks available in the market to meet your needs. Options range from polyurethane based caulks, fire resistant caulks, moisture cured, and high and low strength caulks.

2. Clean the joints with a cloth or scrub with a solid brush to remove signs of any earlier compound treatment, grease and water resistant gels. Sandblast a concrete joint if possible. Clean metal or glass surfaces with a toluene based compound. Let the joint dry out completely if it contains any moisture.

3. Fill the joint with polyurethane foam or a polyurethane rod which is available at a hardware store. This gives the caulk a base to sit on.

4. Purchase a suitable caulking gun for easy and mess-free application. Fill the gun with the product and apply it to the expanded joints. Spread the caulk with a trowel if the joints are large in size.

5. Call a professional if you experience difficulty when caulking the expanded joints. Discuss the various options and treatment cost before proceeding with the task.

6. Reapply the caulk annually if it shows signs of wear or the joints undergo more expansion.

[StevenHB]

on 6/2/2008 I don't know if you received my comment. What are the advantages and disadvantages of different caulks? Some are self-leveling, others semi-self-leveling, while others are neither. Which are easiest to apply? Most durable? Appropriate in what environments?