Re-caulk exterior window frames

Why It Matters

Failed caulk lets water seep behind siding and into walls, causing rot, mold, and insulation damage that's expensive to repair.

Tools

• Caulk gun
• Putty knife or caulk removal tool
• Rag

Materials

• Exterior-grade silicone or polyurethane caulk

How to Do It

1. Inspect each window frame for caulk that is cracked, peeling, or pulling away from the surface.
2. Use a putty knife or caulk removal tool to scrape out all old, damaged caulk from the joint.
3. Wipe the joint clean and let it dry completely before applying new caulk.
4. Load the caulk tube into the gun and apply a steady bead of exterior-grade silicone or polyurethane caulk along the joint.
5. Smooth the bead with a wet finger to press it into the joint and create a uniform seal.

Related Tasks

• Clean window screens Once a year
• Clean window tracks and weep holes Once a year
• Clean windows inside and out Once a year
• Replace window weatherstripping Once a year