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SOUND CONTROL

Compliance with State Noise Insulation Standards is now required for all new multi-family dwelling units constructed in California. These standards set minimum rating for sound transmissions for party walls between dwelling units. The sound transmission values for various masonry walls is listed below. We suggest you consult your latest edition of "The Concrete Masonry Design Manual" for more complete information on the subject...

  wall thickness
(inches)
STC WALL DESCRIPTION weight
of wall
lbs
/sq. ft
TEST NO
  4   Hollow Concrete Block, Unplastered, Ungrouted    
    40 Lightweight Units, Unpainted 18.0 KAL 359-1.66
    41 Normal Weight Units, Painted Both Sides (2Coats) 26.5 TL 67-99
           
  4   Hollow Concrete Block, Painted Both Sides (2Coats)    
    43 Lightweight Units, Ungrouted 22.0 KAL 1379-5-72
    44 Normal Weight Units, Ungrouted 29.0 KAL 1379-3-72
           
  4   Hollow Concrete Block, Plastered Both Sides, Ungrouted    
      Normal Weight Units 34.8 TL 67-102
           
  4   Hollow Concrete Block, ½ inch Gypsum Board on Resillent
Channels each side
   
    47 Lightweight Blocks, Ungrouted 26.0 KAL 1379-4-72
    48 Normal Weight Blocks, Ungrouted 32.0 KAL 1379-2-72
  4 48 Hollow Concrete Block, Plastered both sides, Ungrouted 30.0 KAL 359-7-66
           
  6 44 Hollow Concrete Block, Unpainted, Unplastered, Ungrouted 21.0 KAL 359-4-66
           
  6   Hollow Concrete Block, Painted Both Sides (2 Coats)    
    46 Lightweight Blocks, Ungrouted 28.0 KAL 933-2-70
    48 Normal Weight Blocks, Ungrouted 39.0 KAL 1379-1-72
           
    53 Hollow Concrete Block, 2 Coats Paint One Side
½ inch Gypsum Board on Resilient Channel Other Side
27.0 KAL 359-6-66
           
  8 45 Hollow Concrete Block, Unpainted, Unplastered,Ungrouted 36.0 KAL359-3-66
           
  8 48 Hollow Concrete Block Painted Both Sides (2 Coats) Ungrouted 33.5 TL 67-61
           
           
  8 49 Hollow Concrete Block, Unpainted, Unplastered, Ungrouted 42.8 KAL1144-2-71
           
  8 50 Hollow Concrete Block,Exterior Wall Painted Outside (2 Coats)
Gypsum Board on Furring Strips Inside, Ungrouted
45.6 TL 67-93
           
  8 51 Hollow Concrete Block, Cells filled Zonolite, Unpainted 39.6 KAL 1144-4-71
           
    52 Hollow Concrete Block, Normal Weight Block, Ungrouted Unpainted 53.0 KAL 1144-3-71
           
  8 55 Hollow Concrete Block, Normal Weight Block, Ungrouted
Painted Both Sides (2 Coats), Reinforced
73.0 KAL 1023-3-71
           
  8 56 Hollow Concrete Lightweight, Ungrouted
5/8 inch Gypsum Board on Resilient Channels One Side
Lightweight Block
40.4 KAL 933-1-70
           
  8   Hollow Concrete Lightweight Block, Solid Grouted, Reinforced    
    56 ½ inch Gypsum Plaster Both Sided
79.0 KAL 1023-9-71
    60 ½ inch Gypsum Board on Resilient Channels, Both sides 77.0 KAL 1023-3-71
           
  12 55 Solid Concrete Block, Unpainted, Unplastered
1212.0 NGC 3002
           
  12 58 Solid Concrete Block, 5/8 inch Gypsum Board on Resilient
Channels, One Side
124.0 NGC 3003
           

 
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