Gypsum Wall Assembies

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Standard Wall Assembly:

This is a standard stud wall, only with 24” OC studs. 16” OC studs are far more common in residential and commercial construction, and as you can see below, a 16” OC wall performs poorly.


Wood 24in. O.C. Stud Walls

  • 24" On Center, 5/8" Drywall on bothsides
  • STC 47 - 24"OC Wall Framing
  • STC 52 - 24"OC Wall Framing
  • STC 52 - 24"OC Wall Framing
STC Source Side Wood Studs Insulation Receive Side Report
37 One 5/8" layer of drywall 24" OC none One 5/8" layer of drywall
40 One 5/8" layer of drywall 24" OC R13 One 5/8" layer of drywall 05-1003
42 Two 5/8" layers of drywall 24" OC R13 One 5/8" layer of drywall 05-1058
44 Two 5/8" layers of drywall 24" OC R13 Two 5/8" layers of drywall 05-1059

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Steel 24in. O.C. Stud Walls

  • Acoustical Reference: STC 48
  • Acoustical Reference: STC 49
  • Acoustical Reference: STC 54
STC Source Side Steel Studs Insulation Receive Side Report
48 One 5/8" layer of drywall 24" OC R13 One 5/8" layer of drywall 92-410
52 Two 5/8" layers of drywall 24" OC R13 One 5/8" layer of drywall 42-411
56 Two 5/8" layers of drywall 24" OC R13 Two 5/8" layers of drywall -

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Wood 16in. O.C. Stud Walls

  • STC 36 - 16"OC Wall Framing
  • STC 38 - 16"OC Wall Framing
  • STC 40 - 16"OC Wall Framing
STC Source Side Wood Studs Insulation Receive Side Report
34 One 5/8" layer of drywall 16" OC R13 One 5/8" layer of drywall 93-157
36 Two 5/8" layers of drywall 16" OC R13 One 5/8" layer of drywall 93-158
38 Two 5/8" layers of drywall 16" OC R13 Two 5/8" layers of drywall 93-174

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Steel 16in. O.C. Stud Walls

STC Source Side Steel Studs Insulation Receive Side Report
46 One 5/8" layer of drywall 16" OC R13 One 5/8" layer of drywall 93-344
51 Two 5/8" layers of drywall 16" OC R13 One 5/8" layer of drywall 93-345
55 Two 5/8" layers of drywall 16" OC R13 Two 5/8" layers of drywall 93-424

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Wall Type Comparison

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STC Source Side Wood Framing Insulation Receive Side Solution
71 Single layer of 5/8" Gypsum Double Stud 24"OC  R13 Two layers 5/8" Gypsum + Green Glue 58OZ per 4x8 + 7/8"  Drywall Furring Channel + IB-1 Soundproofing Clips SPC 3
67 Two 5/8" layer of Gypsum Single Stud 24" OC R13 Two layers 5/8" Gypsum + Green Glue 58OZ per 4x8 + 7/8"  Drywall Furring Channel + IB-1 Soundproofing Clips SPC 2
52 Single layer of 5/8" Gypsum Single Stud 24" OC R13 Two layers 5/8" Gypsum + 58OZ per 4x8 sheet SPC 1
53 Single layer of 5/8" Gypsum Single Stud 24" OC R13 Two layers 5/8" Gypsum + 7/8" Drywall Furring Channel @ 24" OC + IB-1 Clip View
45 Single layer of 5/8" Gypsum Single Stud 24" OC R13 1/2" Gypsum + MLV + 1/2" Gypsum View
42 Single layer of 5/8" Gypsum Single Stud 24" OC R13 Two layer of 5/8" layers of Gyspum View

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SPC - Wall Assembly Solutions


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