U370 Firewall Insulation

Northwest Insulation along with GreenFiber offers Fire and Sound Products (FSP), a GreenFiber division that brings together dedicated resources and reliable support to assist architects and builders to identify UL-approved, high performing construction assemblies with fewer materials, fewer costs and greater confidence. The Fire and Sound Products advantage incorporates proprietary construction design, quality assurance tools and a thorough installation training program for FRM specialists.

FRM - Fire Rated Material is the new fire resistive material specifically designed and manufactured for the proprietary UL-U370 two-hour firewall for town homes. FRM is only available through FRM Specialists.

What is STC?

Sound Transmission Class (STC) is a numerical rating in decibels (dB's) of an assembly's ability to reduce airborne sound transmission over a limited frequency range. ASTM Test Method E90 is used to generate transmission loss data on an assembly, and ASTM E413 uses this data to calculate an STC rating. The single-number ratings correlate with sound transmission for speech, radio, television, and similar sources of noise. For other sources such as machinery, many music systems, and transportation noises, accurate STC assessment requires detailed frequency band analysis.

Materials

Metal framing reduces sound transmission significantly better than equally dimensioned wood, as does wider spacing between framing members, regardless of material. Likewise, a break or separation between materials in the path of sound (the vibration path) can significantly reduce sound transmission.

The mass or weight of an assembly's membrane also contributes to sound control. For example, added sheets of gypsum board absorb more sound, and a cement block wall absorbs more sound than an empty 2 x 8 frame wall. Likewise materials with higher density and airflow resistance are better at reducing sound transmission.

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