What type of glazing would I need to use in my product to achieve an OITC rating of 30 or an STC rating of 40?
Based on our experience at the Architectural Testing Acoustical Laboratory, an OITC rating of 32 or STC rating of 40 is very difficult to achieve on a window with conventional 1″ insulating glass. To achieve these ratings and above, a dual window configuration with two sets of sash or a prime window with an exterior or interior storm panel is generally required. The table below outlines the typical range of ratings of different glazing options. These ratings may be lower if the window has significant air leakage or if there are flanking problems between the primary and secondary sash. There are many other factors that may affect the overall rating of a window (e.g. materials used, daylight opening size, etc.). If you require a different rating or have any questions about the table below, please contact us for more information. Prime Window IG Glazing Prime Window IG Glazing Prime to Secondary Air Space OITC Rating STC Rating 1/8″ anneal, 1/2″ air, 1/8″ anneal N/A None 23-24 27-28 1/4″
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