Based upon the data and methodologies compiled in American Wood Council's Technical Report No. 15 (TR15), this calculator simplifies the calculation of sound transmission through wood-frame floor and ceilings. Sound transmission class (STC) and Impact insulation class results are given as well as the following detail data at ⅓ octave band center frequency ranging from 125 Hz to 4000 Hz: TL / STC: - Floor Layer Estimated Transmission Loss - Ceiling Layer Estimated Transmission Loss - System Effect - Estimated Transmission Loss - ASTM E413 Reference Contour - STC shifted Reference Contour - Estimated Transmission Loss Deficiencies ISPL / IIC: - STC Transmission Loss - ISPL Adjustment - Estimated Impact Sound Pressure Level - ASTM E989 Reference Contour - Shifted Reference Contour - Impact Insulation Deficiencies
