Altos walls provide both sound-blocking and sound-absorbing properties. Altos' ability to block sound transmission equals or exceeds standard drywall construction or other wall systems. No insulation is required to achieve normal speech privacy.

STC (Sound Transmission Class)

· Solid full-height elevation provides:
- 40 STC with no insulation
- 45 STC with insulation

· Double Glazed full-height elevation provides:
- 38 STC
- A balance of acoustic privacy and light penetration

· Acoustic fascias provide:
- 40 STC with recycled cotton insulation
- 32 STC with no insulation

· Standard drywall construction:
- 32-35 STC with no insulation

NRC (Noise Reduction Coefficient)

· Acoustic fascias provide:
- 0.75 NRC