My drawings show Type ‘IR’ deck. What is that?

Type IR is the current Steel Deck Institute standard designation for “intermediate rib” roof deck, which was formerly known as “Type F”.

Architects and engineers often alternate between new and old SDI and manufacturer designations when they call out deck types on their drawings. In order to help you sort through all of the different names that are used to refer to the same profile, we have compiled the table below.

We dug deep into our archives to include designations used by companies that have long since vanished, but whose product codes continue to appear on some drawings. If you ever come across a designation that does not appear in this table, please call us and ASK D-MAC to help!

ROOF DECK
Deep Rib (3DR) Wide Rib (WR) Intermediate Rib (IR) Narrow Rib (NR)
N  B F A
3N B-36 F36
N-24 BN-36
NN-32 BW36
NS P-3606
P-2404 Interlocking
Interlocking BI
3NI DGB-36
DGN-32 HSB-36
N-24 Acoustical
NI BA
P-2436 BW-A
Acoustical HSB-36
3NA Cellular
N-24 Acoustical 1-1/2″ Cellular
N-A BC
NA BP
NSA DGBF-36
Cellular Cellular/Acoustical
3″ Cellular-A 1-1/2″ Cellular-A
3NC BCA
3NP BPA
DGNF-32
NC
Cellular/Acoustical
3″ Cellular-A 
3NCA
3NPA
NCA
FORM DECK
9/16″ DECK 15/16″ DECK 1-5/16″ DECK 1-1/2″ DECK
 .6C  1.0C 1.3C 1.5C
.6FD 1.0FD Deep Vercor 1.5FD
CF 1/2″ 1.0FD EHD CF 1-3/8″
P-3012 CF 7/8″ TF125 EF
S EHD TFH3 SD
SF HD Vented TF150
SF-1 HF 1.3CSV Vented
Shallow Vercor SF-2 TV125 EVF 
STD TF75 TVH3
TF50 UF1X
TFS3 Vented
TFSF1 1.0CV
UFS 1.0FDV 
VS SV-2 
Vented TV75 
.6CV UF1XV 
.6FDV
SV-1
SVF 
TV50 
TVS3
COMPOSITE FLOOR DECK
1-1/2″ DECK 2″ DECK 3″ DECK
 1.5VL  2VLI 3VLI
1.5 V-GRIP 2″ Composite  3″ LOK-FLOOR
1.5CD 2″ LOK-FLOOR 3.0CD
1.5CF 2.0CD 3.0CF
1-1/2″ LOK-FLOOR 2.0CF 312 V-GRIP
B FORMLOK 212 V-GRIP 3W
B-LOK 2W CFD3
CFD1.5 CFD2 DG3W-36
LOK-1.5 DG2W-36 LOK-3
P-3606 Composite LOK-2 P-2432
SB150 P-3623 SB300
Interlocking SB200 W3 FORMLOK
P-3615 Composite  W2 FORMLOK Interlocking
1.5VLI  Interlocking 3WF 
Cellular 2WF  Cellular
1.5VLP Cellular 312 Cellular
CFDC1.5  2VLP 3VLP
Cellular/Acoustical 212 Cellular CFDC3
1.5VLPA  CFDC2 DG3WF-36 
CFDCA1.5  DG2WF-36  Cellular/Acoustical
Inverted Cellular/Acoustical 3VLPA 
1.5VLR  2VLPA  CFDCA3
CFDCA2