Soundproof doors

More peace and quiet with a heroal soundproof door, because it insulates sound by up to 39 decibels.

Soundproof doors

Effective sound insulation

In addition to burglary protection , thermal insulation and design , sound insulation also plays an important role in the choice of a front door. heroal aluminium front doors are available up to sound insulation class 3, which means they can reduce the sound level by up to 39 decibels. A conventional room door, on the other hand, achieves sound insulation of around 15 to 25 decibels. There are several factors that make a good sound insulation door – such as the mass, the tightness and the installation. Every element has to be properly integrated to provide effective sound insulation.

What’s so special about heroal soundproof front doors?

Soundproofing class 3

With soundproofing values of up to 39 decibels (db), aluminium front door systems by heroal meet the standards of soundproofing class 3. The sound insulation value largely depends on the door panel, the frame profile and the professional installation.


Thanks to decades of expertise and specific components, such as sealants and insulations, we have developed a technically mature design which makes a significant contribution to the soundproofing of heroal front doors.

100 % foam filling

The profiles of heroal front doors are 100 % foam-filled. The special foam-filling process developed by heroal increases both thermal and sound insulation.

Sound insulation for doors

Mass - The higher the mass of a door, the better its soundproofing effect. Heavier doors make it easier to reflect incident sound waves for higher sound insulation values.
Door leaves - Since single-layer components have to be very heavy to achieve sufficient sound insulation, multi-layer components are often used instead. In this way, a structure with a comparably low weight can achieve higher sound insulation.
Door frame - The construction of heroal doors ensures that the door frame reflects and absorbs sound waves. heroal acoustic door frames are made of aluminium, which allows them to achieve optimum soundproofing values.
Sealants - Since sound waves pass through the smallest openings, there is no insulation without sealants. Acoustic and rebate sealants make sure that both door sash and door frame are tight, just as the sealants between door and floor.
Installation according to tested installation instructions - Even the best soundproof door will not work without proper installation. Qualified installation by our specialist partners ensures effective sound insulation.

Interesting facts about sound insulation

Sound insulation for doors is often indicated with the sound reduction index (Rw) and test value (Rw,P). The sound reduction index (Rw) provides a guide to the measured sound insulation when the door is installed. The test value (Rw,P), on the other hand, represents the sound insulation under laboratory conditions. Since the test value should be 5 dB higher than the desired value, the following formula is used: Rw = Rw,P - 5 dB.

Sound insulation classes for doors according to DIN 4109

Soundproofing class Sound reduction index Rw (dB) test value Rw, P (dB) Rw (dB) adjacent components installation conditions
1 25-29 min. 32 min. 35  
2 30-34 min. 37 min. 40 connection joints plastered in beige or sealed
3 35-39 min. 42 min. 45 same as class 2, additional fully backfilled frame

heroal front doors for optimal noise protection


Effective soundproof doors by heroal

Depending on the requirements, heroal acoustic doors can be upgraded as high as sound insulation class 3, which allows them to meet the highest sound insulation demands. Try them out for yourself. We would be happy to give you more information about the right acoustic door for your home. Give us a call, visit our specialist partners and let us inspire you.

  • Certified sound insulation
  • Sound insulation classes 1 to 3
  • Tested quality, made in Germany
  • reliable and durable
  • mets passive house standards
  • integrable with smart home

Surfaces and variety of colours

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Further reading for your interest

The heroal promise

When it comes to how we live and work, the most important thing is having choices. heroal knows that. As a family-run company with more than 140 years of experience, we believe that when it comes to quality, there are no compromises. That is why our products give you a way to create ideal solutions for nearly any requirement. As a technology leader, we believe that quality means more efficiency, more reliability and more performance – solutions that are "SIMPLY. BETTER."

  • over 3,500 specialist partners worldwide
  • products with tested quality
  • family-run company with a long tradition
  • made in Germany
  • personalised design
  • comprehensive range of services
  • superior technical solutions