The OITC (Outside-Inside Transmission Class) rating is used to classify acoustic performance of glazing in exterior applications. interlayer (where applicable). Data is based on testing ~36" x 84" glass to ASTM E413-87 in an acoustical wall. *OITC is estimated based on this test. Glass size and glazing system will affect STC rating.

May 22, 2022 · What an OITC Rating is, why it is important, OITC vs STC, and examples of noise levels you can expect with different OITC and STC ratings.

Oct 18, 2023 · An outdoor-indoor transmission class rating chart is used to understand the decibel scale and its relation to OITC ratings. A higher sound transmission class rating indicates more effective sound insulation than a lower rating.

The definitions of two ratings: Sound Transmission Class or STC and Outdoor-Indoor Transmission Class or OITC; The project’s design requirements and how they impact the glazing system, and; How to calculate an STC or OITC rating; STC versus OITC. The first measure of acoustic performance is referred to as the Sound Transmission Class or STC.

Mar 5, 2025 · To determine how much sound a material or assembly can block, we test them and use the results to determine an STC and/or OITC rating. Let’s understand the difference. Originally developed to determine the sound transmission between interior walls, STC is the original and most widely used and recognized rating system when it comes to soundproofing.

Nov 25, 2022 · To determine how much sound is transmitted through a window, manufacturers conduct testing to calculate ratings for two primary ratings: Sound Transmission Class (STC) and Outdoor/Indoor Transmission Class (OITC).

Transmission Class (OITC) rating describes its approximate decibel level reduction of sounds such as those of roadway and rail traffic, and of nearby aircraft takeoffs.

A relatively new way of measuring sound transmission, an OITC rating (which stands for Outdoor–Indoor Transmission Class) provides information about how well a barrier blocks against certain types of frequencies.

OITC ratings are calculated over the frequency range of 80 to 4000 Hz, and are weighted more towards low frequencies. Once a barrier is tested against the range of frequencies and the results are plotted on a graph, the curve created is compared against OITC standards determined by the American Society for Testing and Materials (ASTM).

The OITC (Outside-Inside Transmission Class) rating is used to classify acoustic performance of glazing in exterior applications. interlayer (where applicable). Data is based on testing ~36" x 84" glass to ASTM E413-87 in an acoustical wall. *OITC is estimated based on this test. Glass size and glazing system will affect STC rating.