2014
STC (Sound Transmission Class)
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STC Definition and Options
STC ratings are single number indicating the sound insulation value of a door or window (including partitions and floor-ceiling assemblies.) A door’s ability to reduce noise is called its sound transmission loss (TL) effectiveness.
TL is a value given in decibels (dB) which is determined by measuring sound pressure levels at a certain frequency in the source and receiving rooms.
See image using STC 39 as a sample -->
These values are fitted to a curve in a method defined by the ASTM E413 Classification Standard for Rating Sound Insulation. The higher the STC value, the better the rating and the better the performance.
Figure 1
Figure 2
Haley offers architectural doors with the following STC ratings, sub components, and gasketing:
STC 32- Standard Particle Board Assembly- (1LD1 Core) APC Bond to Core.
STC 32- Lumber Core Assembly- ALC Bond to Core.
STC 33- 36 lbs to 40 lbs Core- (1LD2 Core) APC Bond to Core, No Lead, Standard Stiles and Rails.
STC 35- 44 lbs to 45 lbs Commercial Density Core- Bond to Core, No Lead, Standard Stiles and Rails.
Any unsealed gaps and clearances in door assemblies effectively cancel out the noise reduction benefits of STC rated doors. For example, 1⁄8″ clearances around the edges reduce the effective rating of an STC-52 door to STC-21!
Gasketing’s importance derives from a fundamental property of sound: Sound waves travel through any opening with very little loss. While the amount of air flowing through a gap increases in proportion with the size of the gap (see Figure 1) the size of the gap in a sound barrier does not matter (see Figure 2.) A tiny hole transmits almost as much sound as a much larger gap.
STC 40- SLM Stiles and Rails
1 lb Lead
1/2" Particle Board Sound Board
Soundboard
1/2" Particle Board Sound Board
1 lb Lead
Pemko 2005V Threshold, 234V Sweep with Two sets of S88 Gasket.
STC 41- SLM Stiles and Rails
1 lb Lead
1/2" Particle Board Sound Board
Soundboard
1/2" Particle Board Sound Board
1 lb Lead
Pemko 2005V Threshold, 234V Sweep with Two sets of S88 Gasket and One Additional set of 319R Seal.