Why do you still hear noise after installing soundproof walls? 10 points to inspect



Why do soundproof walls still leak sound? 10 design blind spots to check

: When building soundproof walls, many people might wonder why sound still leaks despite using high-performance materials. For example, choosing a wall model with high acoustic ratings on paper but in reality, sound still leaks through. Flanking Transmission is one of those 10 blind spots. Besides this, there are issues with service penetrations, wall joints, perimeter flanking, or even selecting an Acoustic Door that doesn't match the wall's STC rating, causing the actual sound performance to fall short of expectations. Let's look into these details to ensure your next project achieves the acoustic performance you aimed for.

Tips for choosing acoustic materials to solve sound leakage problems. Selecting the right materials with high STC ratings can be a challenging task for many, but choosing the right materials for your specific needs is essential. Here are 10 expert tips to help you select and install acoustic materials effectively to get the best results.

1. Choose the right door seals

Doors are often the weakest point in soundproofing a room, allowing sound to easily pass through gaps. Using acoustic door seals (Door Sweep) or drop-down door seals helps block sound from leaking through gaps beneath doors, which is a common issue in many buildings.

2. Seal all gaps

Planning and installation of acoustic ceiling and wall systems requires professional expertise and high precision, as well as strict compliance with design standards. Because poor installation can lead to various problems, such as reduced acoustic performance or structural issues, choosing a reliable contractor with specialized expertise and a proven track record is essential for achieving the best results.

3. Maintenance

Regular maintenance helps extend the lifespan of acoustic materials. Although high-quality acoustic systems are durable, minor issues like surface wear or minor damage can still occur over time. Regular inspections and timely repairs—such as using Trandar Sealant to address gaps or minor damage—will help maintain optimal acoustic performance for the long term.

4. After-sales Service

Reliable after-sales service is another critical factor. A trustworthy supplier should provide professional technical support, warranties, and prompt assistance in case any issues arise with the acoustic materials, ensuring complete peace of mind throughout the project lifecycle.

5. Maintenance Access

Another important aspect when designing acoustic ceilings is accessibility to the plenum space above the ceiling for maintaining various building systems, such as electrical wiring, air conditioning, and fire suppression systems. Therefore, choosing a ceiling system with good accessibility is essential. While standard concealed grid ceilings can sometimes present challenges when accessing the space between floors (Deck to Deck), solutions can be engineered using Trandar Hitech Ceiling systems, which provide excellent accessibility while maintaining aesthetic appeal.

6. Noise Control

Addressing impact noise between floors is another crucial consideration when designing buildings, as it can severely disrupt occupants if not properly mitigated. Effective solutions include implementing specialized floor systems such as Floating Floors, which help significantly reduce impact sound transmission between levels.

7. Safety and Standards

Preventing sound leakage is as important as choosing the right material for soundproofing. Even if high-performance acoustic materials are selected, improper installation can still lead to sound transmission issues. For example, using standard wall studs instead of resilient channels (Isolation Clips) can cause sound vibrations to easily transfer through the wall system, reducing the overall acoustic performance.

8. Flanking Transmission

Flanking Transmission refers to sound traveling through "hidden" paths other than the main wall structure. Even though items 1-7 and 9-10 in this guide focus on direct sound transmission, flanking transmission is another critical factor. Sometimes, the STC rating tested in a laboratory shows high sound insulation for a wall system, but real-world conditions might yield lower performance than expected. This is because flanking noise can bypass the primary soundproofing barrier, making proper design and installation essential to control flanking paths and achieve the desired STC rating.

9. Choosing Acoustic Doors

Standard partition systems (Hollow Core) often encounter issues with sound transmission between rooms. To properly address these concerns and achieve an STC rating of 60, specific architectural design and construction techniques are required. Utilizing high-performance Acoustic Doors is also crucial for preventing sound leakage through doorways, ensuring overall acoustic efficiency and peace of mind in every room.

10. Soundproofing Doors

Soundproofing conference rooms is another area where acoustic ceiling and wall systems play a vital role. In addition to selecting materials with high STC ratings for walls and ceilings, installing professional acoustic doors is essential. These doors are specially designed to prevent sound from escaping through gaps, helping to create a truly quiet and private meeting environment.

Interested in soundproofing consultation or acoustic materials? Contact us today.

Addressing acoustic problems with high STC ratings often involves more than just selecting the right materials; it requires a comprehensive understanding of how sound travels. A common mistake is focusing solely on the noise reduction coefficient (NRC) of 10 while overlooking how sound actually transmits through various building elements.

Trandar Acoustics not only offers premium acoustic solutions tailored to your needs, but we also provide expert advice on every aspect of sound insulation design. Furthermore, Trandar Sealant effectively prevents sound leaks, perfectly complementing Trandar Hitech Ceiling for superior acoustic performance.

For more information and expert tips on acoustic design, follow us at Trandar Acoustics to stay updated on the latest news and innovations in acoustic systems.