Broward County Certificate of Competency 20-WD-21968-X
Why do I still hear outside noise after installing impact windows?
A straight answer for Broward County homeowners, then what you can check yourself and when to call. Free estimate: (954) 906-1715.
Impact windows cut noise, but they rarely block it all, because sound also travels through gaps, sashes, weatherstripping, nearby doors and the walls themselves. If you hear more than you expected, the cause is usually a sound path around the glass rather than the glass itself.
The nuance: impact windows are tested and approved for wind pressure and flying debris, not for quiet. How much noise they stop depends on the glass makeup, the frame and sash type, how well the sashes seal, and what else in the wall is letting sound through.
Why it happens
Impact glass is laminated: two panes bonded to a tough interlayer. That layer dampens many sounds, especially higher-pitched ones like voices and birds. Low-frequency noise such as truck rumble, bass music or aircraft passes through any glass more easily, so some of it will always be audible.
Seals matter as much as glass. Operable windows, such as single-hung and horizontal-roller types, rely on weatherstripping and a firm latch. A sash that isn't fully locked, worn or pinched weatherstripping, or a gap in the perimeter sealant between the frame and the opening can let in plenty of sound. Casement and fixed units usually seal tighter than sliding types, but any of them can leak sound if the install isn't tight.
The window may also not be your weakest point. Older sliding doors, entry doors, garage doors, bath and kitchen vents, soffits and thin walls can all carry sound. After the windows are replaced, those other paths become easier to notice. Bear in mind that in a Broward home the windows also have to stay anchored and sealed exactly as the product approval (usually a Miami-Dade NOA) requires, so quieting them should never mean altering the anchoring.
What you can check yourself
Confirm every sash is fully closed and locked
Many operable windows seal properly only when the latch is engaged and the sash is pulled tight. Try the noise test again with all locks set.
Look at the weatherstripping and interior caulk
Check for gaps, flattened or displaced strips, or a visible crack between the frame and the wall trim. Note where you find them rather than pulling anything apart.
Find which windows are noisiest
Stand at each opening with the others closed. If only one or two are loud, the problem is likely a seal or install detail, not the window type.
Check the other openings
Listen near entry doors, sliding doors, garage doors and vents. If the noise is loudest there, the new windows may not be the issue.
Leave the weep slots alone
The small drainage openings in the frame let water out. Don't seal them with caulk to cut noise; that can trap water.
When to call a pro
Call a pro if a sash won't latch snugly, you can see daylight or feel air at the frame, the sealant has cracked or pulled away, or water shows up after rain along with the noise. Those point to an adjustment, seal or installation problem. Don't take sashes apart or alter fasteners yourself, since the anchoring has to match the product approval.
Window replacement in Broward requires a permit, and the work should be done by a properly licensed contractor. For impact windows, we work under Broward County Certificate of Competency 20-WD-21968-X. If you're comparing contractors, verify the license category with DBPR and the Broward County Central Examining Boards. Call us at (954) 906-1715 for a free estimate or to have us look at the problem.
Impact Windows work is done under Broward County Certificate of Competency 20-WD-21968-X (windows, doors, shutters & garage doors).
What a pro will do
- Trace the noise pathWe check sash fit, latches, weatherstripping, perimeter sealant and nearby doors to find where the sound is actually coming in.
- Adjust or correct the sealsWhere possible, we correct sash alignment, hardware and sealant so the window closes as designed, without changing how it is anchored.
- Review the product and install against the approvalWe confirm the unit is an HVHZ-approved product (usually a Miami-Dade NOA) and installed per its approval and the permit details.
- Quote any larger fixIf the issue is a door, a different window type or a replacement, we scope it, handle the permit and inspections, and close out the permit.
Related questions
- Are impact windows supposed to be soundproof?
- No. They reduce noise noticeably for many homes, but they are approved for wind pressure and debris impact, not soundproofing. Expect quieter, not silent.
- Do fixed or casement impact windows block more noise than sliders?
- Often they do, because they typically compress against a seal when closed, while sliding sashes depend on weatherstripping along a track. The actual result depends on the specific product and how well it is installed.
- Will fixing the noise affect my wind-mitigation form?
- Not by itself. Approved opening protection is one category on form OIR-B1-1802, which a licensed inspector completes, and it is evaluated across all openings. Florida law (s. 627.0629) requires insurers to offer wind-mitigation discounts, but amounts vary by insurer. Our free Wind Mitigation Credit Checker can help you see where you stand.
- Do I need a permit to repair or replace a noisy window?
- Replacement needs a permit in Broward, including like-for-like impact units. Minor adjustments may not, but verify with your city's building department. Condo and HOA approval is usually needed as well.
Get a free impact windows estimate
Tell us what's going on and where in Broward County the home is. We'll get back to you to set up a visit.
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