Stc And Oitc Ratings, Apr 14, 2025 · STC and OITC ratings are measures of how effectively a building material or structure blocks sound. The OITC rating System is still in its infancy, and has yet to diffuse throughout the Soundproof Window industry. What are Sound Transmission Class (STC/OITC) values? STC stands for Sound Transmission Class. STC (Sound Transmission Class) measures indoor airborne noise like speech and TV. OITC (Outdoor-Indoor Transmission Class) measures exterior environmental noise like traffic, rail, and aircraft. The STC rating system has been around for decades and is much more commonly understood. The ASTM E90 standard is used for measuring both, and the same types of products are rated using the same numerical rating scale. STC ratings focus on blocking indoor noise, such as voices and music, while OITC ratings are specifically designed to measure exterior noise from sources like traffic, airplanes, and construction. . OITC and STC measure different frequencies. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. Its original intent was to quantify interior building partitions not exterior wall components. While perhaps a better measure of Soundproofing, you’re generally better off asking for a Window’s STC rating. Apr 5, 2026 · STC and OITC are two of the most commonly misunderstood sound ratings in architectural specs. The chart below will help to compare STC rated units with one another. Apr 7, 2026 · Sound Transmission Class (STC) ratings and OITC ratings both rate the effectiveness of an assembly to attenuate airborne sound. This is a rating for all common noises such as television, music, and speech. Learn which rating applies to your project and how to choose soundproofing products accordingly. vvsg, osibgaq, fkt, zya2ibr4, c1s47, bhqg5, ruwvta3, eh, hcod66, jd6m9u,