references/Architectural/PARTITION TAG NOMENCLATURE.md

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PARTITION TAG NOMENCLATURE

Position	Description	Codes / Meanings
1ST POSITION	Core Material	W = Wood E = Engineered Lumber M = Metal C = Concrete B = Masonry Block
2ND POSITION	Size of Core	Wood: Nominal stud sizes (e.g. 4 = 3½”) Engineered Lumber: (e.g. 4 = 3½”) Metal Stud: e.g. 358 = 3⅝” Concrete: Actual wall thickness (e.g. 8 = 8”) Masonry: Nominal brick modules (e.g. 8 = 7⅝”)
3RD POSITION	Layer Material	See “Layer Material Codes” table below
4TH POSITION	Fire Rating	Ø = 0 Hour 1 = 1 Hour 2 = 2 Hour 3 = 3 Hour 5 = ½ Hour
5TH POSITION (AND BEYOND)	Modifiers	A = Partial height partition (Layers 1–4 terminate at/below hung ceiling) B = Partial height partition (Layer 1 extends above ceiling; others 6" above ceiling) C = Partial height partition (Layer 1 to structure; others 6" above ceiling) D = Full height to underside of structural deck/sheathing F = Full height to underside of structural floor/roof assembly K = Knee wall partition R = Furred-out wall

Layer Material Codes (3rd Position)

Code	Layer 4-L	Layer 3-L	Layer 2-L	Layer 1 (Core)	Layer 2-R	Layer 3-R	Layer 4-R	Details & UL Number
A	—	—	5/8” Gyp. Bd.	2x wood studs 16" O.C. without batt insulation	5/8” Gyp. Bd.	—	—	BASE: 5A/A100 HEAD: 4A/A100
B	—	—	5/8” Gyp. Bd.	2x wood studs 16" O.C. with batt insulation	5/8” Gyp. Bd.	—	—	BASE: 5A/A100 HEAD: 4A/A100
C	—	—	5/8” Gyp. Bd.	2x wood studs 16" O.C. without batt insulation	¼” Air Gap	—	—	—

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Example: M358CØFR

 ┌────┬──────┬────┬────┬────┬────┐
 │ M  │ 358  │ C  │ Ø  │ F  │ R  │
 └────┴──────┴────┴────┴────┴────┘
   │     │      │    │    │    └─ 6th: Furred Wall
   │     │      │    │    └────── 5th: Full Height To Underside Of Structure
   │     │      │    └─────────── 4th: 0 Hr Fire Rating
   │     │      └──────────────── 3rd: Gyp. Bd. On One Side W/ Batt Insulation
   │     └─────────────────────── 2nd: 3⅝" Metal Stud
   └───────────────────────────── 1st: Metal Stud Core