What Should You Do If Your Impact Windows Start Leaking After Installation?
A leak around a newly installed impact window almost always points to a problem with the seal, flashing, or the installation itself — not the glass. Water intrusion after installation is not something to ignore or patch with caulk and hope for the best. The right move is to contact your installer immediately, because most licensed contractors in South Florida are required to warranty their work and carry liability coverage for exactly this situation.
Why Leaks Happen After Impact Window Installation
Water finding its way in after a window swap is more common than homeowners expect, and the causes are usually traceable. The glass itself rarely fails. The weak points are almost always at the edges.
Bad Sealant Application
Improper sealant is one of the most frequent culprits. If the bead wasn’t applied continuously around the entire frame, or if it was applied in cold, damp conditions, you’ll often see water appear at corners or along the sill after a hard rain. Some crews rush this step. A quick visual inspection from inside can reveal gaps or cracking at the frame perimeter — look for discoloration on the drywall near the frame edges first.
Missing or Damaged Flashing
Flashing redirects water away from the rough opening in the wall. If it was skipped, torn, or installed backward, rainwater hits the exterior and travels straight toward the gap between the window frame and the surrounding wall. This is especially risky on older Boca Raton homes where the original flashing was never designed for the size or weight of modern impact-rated units.
Frame Settling or Shim Problems
Impact windows are heavy. A standard laminated glass panel in a large unit can weigh significantly more than the single-pane it replaced. If the installer didn’t shim the frame level and plumb, the unit can shift slightly as the structure settles. That movement breaks the sealant bond and opens a path for water. You might not notice it for weeks — until the first real storm rolls through.
How to Handle It — and What to Expect from Your Contractor
Document everything before you call. Take photos or video of where the water is entering, when it happens (during heavy rain vs. light drizzle), and whether it’s coming from the frame, the sill, or the wall below. That detail speeds up the diagnosis significantly.
Warranty and Contractor Responsibility
Any reputable licensed window contractor operating in Palm Beach County should offer a workmanship warranty. This is separate from the manufacturer’s warranty on the product itself. Installation defects — bad sealing, improper shimming, flashing errors — fall under the installer’s responsibility. If your contractor pushes back or goes quiet, that’s a serious red flag. Florida’s contractor licensing board takes installation complaints seriously, and homeowners do have recourse.
At STS Impact Windows & Doors, every installation follows a structured process designed to eliminate the gaps that lead to these problems. You can also review our FAQ for more detail on what the installation process covers and what to expect post-install.
When It’s Not the Installer’s Fault
Occasionally a leak has nothing to do with the window installation. Roof flashing failures, cracked stucco above the opening, or a failing interior sill pan can all mimic a window leak. A good contractor will help you rule these out rather than just pointing fingers elsewhere. Ask them to do a water test — spraying the exterior with a hose at different angles — to pinpoint the exact entry point before any repair work starts.
Related Questions
Can I reseal my impact windows myself if I spot a small gap?
You can apply exterior-grade silicone caulk to a minor surface gap as a temporary fix, but this rarely solves the underlying problem. If water is getting past the frame or behind the flashing, surface caulk won’t stop it for long. Get a professional assessment first so you’re not masking a bigger structural issue.
Does a building permit protect me if my impact windows were installed incorrectly?
Yes, pulling a permit through Palm Beach County creates a mandatory inspection process. A county inspector checks that the installation meets Florida Building Code requirements, which gives you an extra layer of protection beyond the contractor’s word alone. Work done without a permit skips that inspection, leaving you with no official verification that anything was done correctly. Local residents in areas like Boca Raton can verify permit status directly through the city’s building department portal.
