Seal the Elements: The Best Caulk for Repairing Leaks Around Exterior Window Frames
Leaking or cracked sealant around your exterior window frames is more than just a cosmetic issue. Failed caulk leads to significant energy loss, invites drafts, and, most critically, allows water intrusion that can cause costly damage, wood rot, and mold growth inside your walls. Choosing the right material for repairing leaks around exterior window frames is essential for a durable, long-lasting seal that stands up to weather and temperature changes.
The goal is to find a caulk that offers superior durability, adhesion, and flexibility. We’ll compare the top professional-grade options to help you select the best caulk for the job.
The Top Contenders: Silicone vs. Polyurethane
For exterior window perimeters—an area subject to constant movement (expansion and contraction)—only highly flexible, durable sealants should be used. The two leaders are 100% silicone and polyurethane.
| Caulk Type | Pros | Cons |
| 100% Silicone | Superior flexibility; excellent waterproofing; highly resistant to $\text{UV}$ and |