Myths and Truths in Acoustic Isolation

We dismantle mistaken beliefs to help you build without errors

When it comes to planning acoustic insulation, many decisions are made under the influence of popular beliefs that have little or nothing to do with technical reality. That’s why we’ve gathered the most common myths and debunk them one by one with technical arguments and real solutions.

❌ Myth	✅ Truth
“A single drywall board is enough”	At least two boards per side are required to ensure both mass and acoustic rigidity.
“Rock wool or mineral wool solves everything”	Absorbent materials contribute absorption, but they don’t provide isolation on their own. They are only one component of the complete system.
“Any sealing strip will do”	Only EPDM acoustic strips, like SENOR SE-BEC, provide airtightness, elasticity, and durability.
“Resilient mounts are optional”	They are essential to break structural contact and prevent vibration transmission.
“It’s better to install the floor first”	The floor should go last so that partitions and linings remain decoupled.
“If it looks well installed, it works well”	A system may look correct but fail in key invisible aspects: airtightness, supports, or modulation.
“Elastic connections make insulation worse”	Elastic connections provide safety, rigidity, and vibration absorption—they don’t make the system worse.
“Mineral wool works as a resilient mount”	No. Mineral wool has no elastic recovery capacity. It cannot replace an acoustic mount.
“With acoustic panels I won’t hear my neighbor anymore”	That’s acoustic conditioning, not isolation. It only improves the sound inside the room.
“Everything sold on the market is valid”	Many systems are untested. At SENOR, we test all our systems to guarantee their performance.
“The cheaper, the better”	Price shouldn’t be the top priority—the result is. A bad system is always a bad investment.
“No need to think about safety”	Every component must include a safety device. At SENOR, it’s an essential part of the design.
“If it isolates sound, it complies with regulations”	In many cases, fire resistance EI is also required. SENOR offers systems with EI120 and EI180.
“Installation order doesn’t matter”	It does. The sequence affects final insulation. A bad order can cost you decibels.
“I just need to glue some foam to the ceiling”	Glued foams don’t isolate vibrations or provide safety. They cannot replace a real acoustic system.
“The installer’s experience is enough”	Experience is valuable, but modern systems require specific and up-to-date technical training.
“If I use good products, installation doesn’t matter”	Installation is key. Poor assembly ruins even the best materials.
“No need to seal every joint”	Air and sound leaks can reduce isolation by up to 16 dB. Airtightness is essential.
“Rigid fixings on channels don’t matter”	Without mounts around the perimeter, acoustic bridges are created.
“Any roof support is fine for an acoustic ceiling”	They must be specific and safe. SENOR’s SE-F-RAPID supports are the only ones with DS (safety device).
“A technical sheet is just a piece of paper”	No. It contains key information to ensure product performance.
“It’s all just a matter of luck”	It’s not luck—it’s technical knowledge, proper execution, and tested solutions.
“Adding mounts is enough”	You must choose mounts compatible with the profiles and within their load range.
“You don’t need that many hangers”	Using fewer hangers compromises ceiling safety. The risk of collapse is real.
“Acoustic strips are too expensive and unnecessary”	They are affordable and essential to guarantee airtightness and avoid sound and thermal bridges.
“Drywall boards must be left 1 cm above the floor”	Boards should rest on the acoustic strip. Otherwise, airtightness is lost.
“Strips should only be as wide as the metal profile”	They must cover the profile and boards to ensure proper sealing and prevent transmissions.
“Floors should be built before partitions and/or linings”	They must be done last to maintain element decoupling.
“Exterior walls don’t need plastering”	A plaster layer improves mass, rigidity, and airtightness. It’s fundamental to acoustic performance.
“If I replace or remove some products, it doesn’t matter”	Each component has a purpose. Replacing or removing it can compromise the entire system.
“No need to place absorbent material”	It’s essential in multilayer systems. Without it, acoustic performance drops drastically.
“Resilient mounts are too expensive”	They offer excellent value: improved performance, safety, and faster installation.
“Since insulation isn’t visible, it doesn’t matter”	Even if unseen, it ensures comfort. It’s as essential as electrical or plumbing systems.
“Insulation is a bad investment”	It’s a key investment: improves comfort, increases property value, and prevents future costs.
“If I use a fire-rated board, it meets the standard”	A single board isn’t enough. The entire system must be tested and certified.
“Acoustic insulation is too expensive”	Properly executed insulation is one of the most profitable investments: it improves comfort, avoids neighbor conflicts, increases property value, and reduces future costs.

📌 If you want to learn about the most common mistakes made on-site, we recommend reading this complementary article:
👉 The most common mistakes when performing an acoustic insulation

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Conclusion

Demystifying acoustic insulation is key to making the right decisions. Understanding the technical reality, trusting specialized manufacturers, and executing the system correctly will make the difference between living with noise or enjoying true comfort. If you have questions about your project, SENOR is here to help you.

📧 tecnico@senor.es | 📱 607 411 620