Drywall Making Walls Quiet


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Chapter 10
Drywall Making Walls Quiet

  • STC rating for walls & ceilings
  • Acoustic sealant or caulk

The SBT number represents how much noise is stopped by something. The higher the number the better: the scale is logarithmic, meaning each number is significantly higher than the next, like the Richter Scale for earthquake measurement.

 

STC Ratings for Various Wall & Ceiling Constructions*
2 x 4 wall; 1/2" drywall on both sides; no caulk.
30
2 x 4 wall; 1/2" drywall on both sides; caulked.
35
2 x 4 wall; 1/2" drywall on both sides; additional layer of 5/8 fire-resistant drywall on one side.
38
2 x 4 wall; 1/2" drywall on both sides; additional layer of 5/8" fire-resistant drywall on both sides.
40
2 x 4 wall; 1/2" drywall on both sides; insulated.
39
Staggered-stud 2 x 4 wall; 5/8" fire-resistant drywall on each side; insulated.
50
2 x 4 wall, soundproofing board (base layer) and 5/8 fire-resistant drywall on each side; insulated.
50
2 x 4 wall with resilient steel channels on one side; 5/8" fire-resistant drywall on both sides; insulated.
52
*All assemblies are sealed with caulk, except where noted. Ratings are approximate

 

Cover switch and receptacle boxes with foam gaskets to prevent air leaks. Otherwise, seal around the box perimeter with acoustic sealant or caulk and seal around the knockout where the cables enter the box.

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