Triple glazing is a heat product that people buy for quiet. Why laminated glass blocks noise and triple mostly does not, and what to specify for each.
For noise, laminated wins. For heat, triple wins. People buy triple glazing expecting quiet and are disappointed, because the three thin lites and two narrow cavities of a standard triple unit do little that a good double does not, at some frequencies less. A laminated double unit — two lites of different thickness, one of them laminated with an acoustic interlayer — damps the vibration that carries traffic noise, and in most New York apartments it outperforms a standard triple at less weight and cost. If the target is both, the answer is a laminated triple, and the frame has to be deep enough to take it.
| Build | What it is | Sound (typical) | Heat | Weight / thickness | Cost |
|---|---|---|---|---|---|
| Standard double IGU | Two equal lites, air or argon cavity | Baseline; a resonance dip where both lites vibrate together | Good | Baseline | Baseline |
| Asymmetric double IGU | Two lites of different thickness | Better: the lites resonate at different frequencies | Good | Slightly more | Small increase |
| Laminated IGU | One or both lites laminated with a (preferably acoustic) PVB interlayer | Best per inch: the interlayer damps vibration; strongest at traffic frequencies | Good | Modest increase | Moderate increase |
| Triple IGU | Three lites, two cavities | Often little better than a good double against traffic; helps at some frequencies, and mass helps; the extra cavity is thin | Best | Heaviest, thickest; needs a deep frame | Higher |
| Laminated triple | Triple with a laminated inboard lite | Best overall | Best | Heaviest | Highest |
Sound gets through a window three ways: the glass vibrates, the cavity carries the vibration across, and the frame and seals leak. Triple glazing addresses heat by adding a cavity; it addresses sound only through added mass, and the cavities in a triple unit are narrow — typically 12 to 16 millimetres each — which is too thin to decouple the lites acoustically. At some frequencies the three lites resonate together and the unit performs worse than an asymmetric double. The acoustic ratings prove it: a standard triple is often within a point or two of a standard double on STC, and behind a well-built laminated double.
A laminated lite is two pieces of glass bonded with a plastic interlayer, and the interlayer is soft: it converts vibration to heat instead of passing it through. An acoustic-grade PVB — thicker and softer than standard PVB — does this best, and it is most effective at the 500–2,000 Hz range where traffic, voices and sirens live. Put a laminated lite on one side of an insulated unit, make the other lite a different thickness so they do not share a resonance, and the double unit outperforms a triple against street noise at a fraction of the weight. See acoustic glass and laminated glass.
The single most powerful acoustic tool is distance between the lites — not 16 millimetres but 75 or 100. That is beyond any sealed unit and is why the church window on Amsterdam Avenue is two lites of half-inch laminated glass with a three-inch air space between them: a secondary interior window, not a triple unit. For an apartment on a bus route the same idea — a laminated interior window behind the existing one — often beats replacing the window at all. See frame choice for the frame’s part; a leaking frame undoes any glass.
Noise only: an asymmetric laminated double, 6 mm laminated (acoustic PVB) / 16 mm argon / 4 mm, or heavier, in a frame that seals on compression. Heat only: a triple with two Low-E coatings and argon. Both: a laminated triple, in a European aluminum or uPVC frame with a 44–52 mm glazing pocket. Neither will help if the frame leaks air; noise follows air. Numbers for a specific make-up come from the manufacturer’s acoustic test report; we file those in the Technical Library and specify from them, not from a rule of thumb.
Not especially. It is built for heat. Its narrow cavities do not decouple the lites acoustically, and a standard triple is often no better than a good asymmetric double against traffic noise. For sound, laminated glass.
An asymmetric insulated unit with one laminated lite using an acoustic PVB interlayer, in a frame that seals on compression. For the most reduction, a laminated secondary window with a large air space.
Yes: a laminated triple — a triple unit with a laminated inboard lite. It is heavy and thick and needs a European frame with a deep glazing pocket.
Sound Transmission Class, a single-number rating of how much sound a build stops; higher is better. OITC weights lower frequencies and suits traffic noise. Both come from a lab test on the specific make-up.
Usually one of three things: the triple unit was specified for heat and does little for sound; the frame or perimeter leaks air; or the noise is low-frequency traffic that a thin-cavity unit cannot stop. A laminated lite and a sealed frame are the fixes.
Acoustic Glass Laminated Glass Triple IGU Insulated Glass Units Tempered vs Laminated Amsterdam Avenue Acoustic Window
About this page. Written by Alex GC Inc. d/b/a Alex Glass Construction and reviewed before publication by Aleksandr Chernovolenko, Managing Partner, with our design and estimating lead and a field foreman. Our foremen hold the NYC DOB Site Safety Training supervisor card and our crews the 40-hour worker card; we are certified to fabricate, install and service Alutech and Everest aluminum systems. Facts are drawn from our own projects, manufacturer test data and the applicable codes; where we are giving an opinion, we say so. Last reviewed September 2026. Credentials
Tell us the noise and the window. We will specify the glass make-up from the test data, or a secondary window if that is the honest answer.
