Replace Caulk Around Exterior Windows
Why It Matters
Cracked window caulk is the most common entry point for water into your walls, causing hidden rot and mold damage.
Quick Guide
- 1
Gather your tools and materials
You'll need: Caulk gun, Caulk removal tool, Putty knife. Materials required: Exterior silicone caulk.
- 2
Perform the replace caulk around exterior windows
Remove old, cracked caulk around exterior window frames and apply fresh exterior-grade sealant. Safety note: Use ladder safely for upper-story windows.
- 3
Verify and clean up
Check that the work was completed correctly and clean up your workspace. If upper-story windows requiring tall ladders, consider calling a professional.
Tools & Materials
Tools
- Caulk gun
- Caulk removal tool
- Putty knife
Materials
- Exterior silicone caulk
Community Tips
Caulk applied over wet or moldy surfaces will fail within months, so inspect the window frame for dark spots and use a wire brush to remove all old caulk, debris, and algae before application—GE Silicone 1 ($6-10) adheres poorly to compromised substrate.
Cut the caulk tube nozzle at a 45-degree angle and match the angle to your bead gap size; a 1/4-inch gap requires a 1/4-inch nozzle opening, which prevents over-application and reduces the need for tooling—products like OSI QUAD ($8-12) are forgiving enough for beginners but still professional-grade.
A pneumatic caulk gun ($40-60 range options from Porter-Cable or DeVilbiss) delivers consistent pressure throughout the cartridge and eliminates hand cramping on multi-window jobs, making it a smarter investment than manual guns for exterior work that often requires 2-3 cartridges per project. ---