acoustic curtain or an insulating curtain?
Soundproof, noise-reducing, insulating, acoustic, blackout: five words to describe curtains that don’t all do the same thing. None of these terms is defined by any regulations. Any manufacturer can use them without having to justify it. Here’s how to make sense of it all.
"Acoustic" and "noise-reducing": two words for the same thing
Let's start with the simplest part. From a technical standpoint, there is no difference between a " acoustic curtain " and a " noise-reducing curtain ." These are two marketing terms for the same lens: one designed to reduce some of the light that passes through the aperture.
If a salesperson tells you that one is more effective than the other, they’re making up a distinction that doesn’t exist. What really sets them apart isn’t the name—it’s the curtain’s construction, its weight, and the evidence that supports it.
"Insulation": the most confusing word
This one is worth your attention. In everyday language, “insulating curtain” most often refers tothermal insulation —keeping out the cold in winter and the heat in summer. It has nothing to do with noise.
However, these two properties do not go hand in hand. A standard “ thermal curtain ” curtain—even if it is double-layered and padded—may have no measurable effect on noise pollution. Conversely, a curtain designed for acoustic performance generally provides a thermal benefit, because the mass and the air gap that dampen sound also limit heat transfer.
When a product description states “sound and thermal insulation” without distinguishing between the two, ask which of the two properties was measured and according to which standard.
The Five Appellations, Explained
| Name | What it actually refers to | Measurable? |
|---|---|---|
| soundproof curtain | Reduce the noise coming through | Yes — ISO 10140-2 |
| noise-reducing curtain | Trade name for the previous item | Yes — ISO 10140-2 |
| acoustic curtain | Absorbing the echo in the room | Yes — ISO 354 |
| Insulating curtain | Most often: thermal | Yes — EN 14501 |
| blackout curtain | Block the light | Visual, not auditory |
A very thick " blackout curtain " can give the impression of dampening noise—the room is darker, and the atmosphere is more subdued. This is a perceived effect, not a measured performance.
Regarding the distinction between absorption and attenuation—which is the most misunderstood of the five—we’ve explained it in detail here: soundproof curtain or acoustic curtain ?
The only reliable reference: the standard and the report
Since vocabulary offers no protection, the only useful filter is based on evidence. Three questions are enough to rule out most products marketed as “phonics”:
- Which laboratory conducted the test, and is it ISO/IEC 17025-accredited (BELAC in Belgium, COFRAC in France)?
- Which standard was applied—ISO 10140-2 for attenuation, ISO 354 for absorption, or EN 14501 for thermal performance?
- What is the report number, and can it be provided upon request?
A decibel figure that does not answer these three questions is merely an intended performance, not an actual performance.
What Really Makes a Difference in Your Results
Even with a high-quality curtain, the gap between the lab and your room is almost always due to the installation.
The roller shutter box is the main sound bridge in a window: the curtain must extend above it, ideally all the way to the ceiling. The side overhangs must be 15 to 20 cm on each side; otherwise, sound will bypass the fabric. An air gap of 10 to 15 cm between the curtain and the glass improves sound insulation. And the track closes more smoothly than an eyelet rod, whose ripples reduce the actual width covered.
That is why a curtain made to the exact dimensions of the opening looks better than the same fabric sold in a standard size.
Which Curtain for Which Situation
- Room facing the street, high foot traffic, scooters —custom- acoustic curtain , full-coverage installation, generous overhangs.
- Landing door, hallway noises — acoustic curtain, with a height and width that far exceed those of the door.
- A room that echoes, voices that carry —sound absorption: textiles, rugs, furniture. “ acoustic curtain ” is not the correct answer.
- Cold windows, drafts —a heavy curtain really helps, but fix the seals first.
- Noise coming from a wall or ceiling —no curtains will solve that. An acoustics expert will be more helpful.
The case Cotton Silence
Cotton Silence is first and foremost a sound-attenuating curtain, custom-made to order. The 4-layer composite was tested by the independent Daidalos Peutz laboratory (BELAC/ISO 17025 accredited) in accordance with the NBN EN ISO 10140-2:2010 standard: overall Rw (C; Ctr) rating = 14 (−1; −3) dB, maximum attenuation of 28.2 dB at 5,000 Hz*, and a mass of approximately 1.35 kg/m² for the finished curtain. Report No. A-2020LAB-060-I766-44092_E, available upon request.
In terms of thermal performance, the same mass and the same air gap limit heat transfer. Details on the standards and results can be found on our technology page.
Each custom-soundproof curtain e is manufactured to the exact dimensions of the opening, including overhangs and overlap. The complete testing report is detailed here: the documentation that a reputable manufacturer must provide.
Frequently Asked Questions
acoustic curtain noise-reducing curtain : Which one should you choose?
Both terms refer to the same type of product. Don't base your choice on the name, but rather on the test standard, the laboratory, and the report number.
Does an insulated curtain also block out sound?
Not necessarily. “Insulation” generally refers to thermal insulation. A curtain can be effective against the cold without having a measurable effect on noise. The opposite is more often true: a curtain designed for soundproofing generally provides thermal benefits as well.
Does a " blackout curtain " reduce noise?
Incidentally, blackout fabric is designed to block light. The sense of calm often comes from the darkness and the weight of the fabric, not from any documented acoustic performance.
Does customization really make a difference?
Yes, and that's often the most critical factor. Performance in actual use depends on the overlap and the perimeter seal. A standard size almost always results in side leaks.
View the custom- soundproof curtain Cotton Silence Request advice
*Maximum sound reduction of 28.2 dB measured at the Daidalos Peutz accredited laboratory (report no. A-2020LAB-060-I766-44092_E) in accordance with the NBN EN ISO 10140-2:2010 standard, at high frequencies (5,000 Hz). Overall Rw rating (C; Ctr) = 14 (−1; −3) dB. Actual sound reduction depends on the environment, installation, sealing around the opening, and room configuration.