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Extreme Soundproofing

SONOPAN is a solid, 4′ x 8′, 3/4 inch thick eco-friendly soundproofing panel.  It features cavities of varying dimensions and depths on both sides of the panel. SONOPAN is easily incorporated into the design of new buildings.


SONOPAN absorbs a wide range of frequencies, significantly reducing the transmission of sound and vibrations from one unit to another. With its new patented technology, SONOPAN is an exceptional choice for new multi-unit buildings and condominiums.

Tips from Developers

Tips from Developers

FAQs: Know Your Legal Responsibilities

What is STC?

STC stands for Sound Transmission Class. It’s a unit used to measure how much sound a listener on the other side of a wall can hear.

  • At 25 STC, normal speech can be heard quite easily and distinctly.
  • At 35 STC, loud speech is audible but not intelligible.
  • At 50 STC, very loud sounds such as musical instruments or stereo can be faintly heard.

Is there a legal requirement for STC?

Yes, the Canadian Building Code requires an STC level of 50 between units in multi-residential construction. A basic wall assembly with drywall and insulation will not reach this minimum requirement.

What is the difference between a decibel (dB) and sound transmission class (STC)?

A decibel (dB) is the unit used to measure the intensity of a sound. Sound transmission class (STC) is a rating of the effectiveness of a material or an assembly to block sound from travelling through it. For example, 50-60dB represents the sound measurement of a normal conversation. A wall with a STC rating of 60 will make it barely possible to hear a loud conversation from the other side.

What is the difference between STC and IIC?

STC (sound transmission class) is the measurement of airborne sound transmission, for example in wall or ceiling assemblies. IIC (impact insulation class) is the measurement of impact sound transmission, for example in floor assemblies.

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