Here are my suggestions about determining wall types:

Type  1 or A  – 4 7/8″ (Unrated) 1 Layer 5/8 GWB each side of 3 5/8″ metal stud

Type  2 or B  – 4 7/8″ (1-HR) 1 Layer 5/8 GWB each side of 3 5/8″ metal stud

Type  3 or D  – 6 1/8″ (2-HR) 2 Layers 5/8 GWB each side of 3 5/8″ metal stud

Type  4 or E  – 9 1/2″ Min – Size Varies as needed” (1-HR) Chase Wall  – 1 Layers 5/8 GWB oneside of 3 5/8″ metal stud (4 1/4″) – (then a 1″ air space minimum for the chase) – and then a second 3 5/8″ metal stud with 5/8″ GWB (4 1/4″) – Total 8 1/2 + 1″ space min = 9 1/2″ minimum

  • This is used to run plumbing for water supply and drains.  Toilet drains are 3″ to 4″ diameter depending on the number of toilets it supports.  For a typical sink drain the pipe the pipe is 1 1/2″.  Walls of this kind are often covered by tile – which is considered a finish and not part of the wall type.  It is also common to use “Greenboard” or mold resistant GWB in wet conditions of this kind.  In addition to the thickness of the drain pipe – clamps are required to hold the pipes in place and may require additional room.
  • Some architects will run these pipes within the depth of the 3 5/8″ stud and others prefer to leave a space between the metal studs for the drains. Minimum space between the studs is typically 1″.  This creates a wall of 9 1/2″ and requires that the drain pipes be run partially within the thickness of the metal studs requiring the metal tracks to be cut.  A better practice is to leave more than a 1″ space so the pipes can run independently.  For example leaving a 3 1/2″ space will make the wall 12″ (8 1/2″ for studs and GWB + 3 1/2″ = 12″).  Remember that pipes need room to turn and bend and they also need to be secured in place by clamps.
  • I typically use 1′ to 1′-2″ face to face of GWB.  The holes in slabs made for the pipes require firesafing.
  • As the size varies as needed – In Revit I often make this using two different walls (each 1 layer 5/8″ on 3 5/8″ metal stud) and place this twice and adjust the distance between them – (I will demonstrate)
  • Use 16″ OC studs not 24″ OC
  • https://www.usg.com/content/usgcom/en/design-studio/wall-assemblies/assembly-detail.30109.html

Type  5 or F – 3 3/4″ (2-HR) GWB Shaft Wall  – 1 Layer 1″ GWB Liner Panel – 2 1/2″ CH Studs – 2 Layers 5/8″ Firecode Type X GWB – 1 1/2″ fireberglass insulation

Type  6A or G1 -4 1/4″ Furring – (Unrated) 1 Layer 5/8″ GWB on 3 5/8″ Metal Stud Frame

  • Use this for unrated enclosures around columns or the inner wall of the facade.

Type  6B or G2 -4 7/8″ Furring – (Unrated) 2 Layer 5/8″ GWB on 3 5/8″ Metal Stud Frame

  • Use this for unrated enclosures around columns or the inner wall of the facade – when you need more durability.
  • The construction can be used to achieve a 1 HR fire rating – but steel columns are better protected by spray on fireproofing

Type  7A or H1 -1 1/2″ Furring – (Unrated) 1 Layer 5/8″ GWB on 7/8″ Metal Furring or Hat Channel

Type  7B or H2 -2 1/8″ Furring – (Unrated) 2 Layers 5/8″ GWB on 7/8″ Metal Furring or Hat Channel

Type  8 or J -7 5/8″ actual (8″ Nominal) (2-HR) Rated – Concrete block wall.

 

 

 

 

 

 

 

 

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