How is Oitc measured?

A barrier’s OITC rating is measured using data gathered over an 80 to 4000 hertz frequency range. Once the data is collected, professionals calculate a barrier’s OITC rating in accordance with standards laid out by the American Society for Testing and Materials (ASTM).

What is the difference between Oitc and STC?

STC was originally developed to measure the sound transmission between interior walls. OITC is a newer rating system developed specifically for measuring sound transmission of low- and mid-frequency noises through exterior walls.

Is higher or lower Oitc better?

OITC ratings are generally lower than STC ratings because the results are in decibels rather than the STC point system. Higher numbers in both are better.

What does STC 45 mean?

A sound blocking level of STC 45 means that a listener in a quiet room would hear raised speech in adjacent rooms, but would not be able to understand the conversation. The transmitted noise would not typically be disruptive.

What does Oitc stand for?

Outdoor/Indoor Transmission Class
Outdoor/Indoor Transmission Class (OITC) is a number rating of the sound transmission loss of a constructed assembly tested with lower frequencies to represent sound typical of modes of transportation.

What is a good Oitc rating for Windows?

OITC rating (frequency range – 80 to 4000 hertz) The larger the number, the better the window is at reducing low-frequency sounds that enter a home.

What is Oitc rating?

Outdoor/Indoor Transmission Class (OITC) – The OITC rating is used to measure the sound transfer between outdoor and indoor spaces. It uses decibel (db) levels measured between frequencies of 80 Hz and 4,000 Hz, making it a better measure for low sound frequencies such as road noise.

What is the STC rating of glass?

Standard Glass Standard walls in most homes are 33 STC, while studio-level soundproofing requires a rating of at least 45.

What is a good Oitc rating for windows?

What is the highest STC rating?

The STC rating goes all the way up to 65. Most products don’t promise anything above 55 and even at a rating of 60, it still doesn’t guarantee complete soundproofing. Nothing is completely soundproof. You cannot stop outside noise completely from entering your space.

How do you calculate sound transmission class?

Find the average transmission loss: Add up all the total frequencies you recorded, then divide that number by the total number of frequencies you tested. For example, if you recorded all 16 frequencies, divide your total by 16. The number you calculate is your STC rating.