Type “F” Roof Deck (Intermediate Rib)

Type “F” deck is typically used when 2”or less of roof insulation is present to prevent insulation damage over the deck valleys. Today Type F roof deck is most commonly used for repairs and re-roofing projects.

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Section Properties (Fy=33 ksi)

The tensile strength of sections of steel are represented in kilopound per square inch (ksi)
is a scaled unit derived from psi, equivalent to a thousand psi (1000 lbf/in2).

Gage	Design Thickness	Weight (psf) PTD	Weight (psf) Galv	I p(In4)	In(In4)	Sp(In3)	Sn(In3)
22	.0295	2.01	2.05	0.6152	0.8158	0.3604	0.4129
20	.0358	2.58	2.65	0.7921	1.0216	0.4748	0.5311
18	.0474	3.20	3.40	1.1625	1.3695	0.7027	0.7502
16	.0598	4.10	4.25	1.5909	1.7448	0.9132	0.958

– Section properties calculated in accordance with AISI specifications.

 

Uniform Total Load in Pounds Per Square Foot (Dead and Live)

Live loads include any temporary or transient forces that act on a building or structural element. … We measure uniform live loads as pounds per square foot (psf). The acceptable live load will vary considerably based on the occupancy and expected use of a structure or structural element.

Gage	Span Cond	Max SDI Const SP	4’-0”	4’-6”	5’-0”	5’-6	6’-0”	6’-6	7’-0”	7’-6”	8’-0”	” 8’-6”	9’-0”
22	One	5’-5”	108	85	69	57	48	41	35	30
20	One	6’-0”	131	104	84	69	58	49	43	37*	32*
18	One	6’-11”	174	137	111	92	77	65*	54*	46*	39*	34*	30*
16	One	7’-9”		173	140	116	97	80*	66*	55*	47*	41*	36*
22	Two	6’-4”	108	85	69	57	48	40	35	30
20	Two	7’-0”	131	103	84	69	58	49	42	37	32
18	Two	8’-1”	174	137	111	92	77	66	56	49	43	38	34
16	Two	9’-1”		173	140	116	97	83	71	62	54	48	43
22	Three or More	6’-4”	135	106	86	71	60	51	44	38	33
20	Three or More	7’-0”	164	129	105	86	73	62	53	46	41	36	32
18	Three or More	8’-1”		172	139	115	96	82	71	62	54	48	43
16	Three or More	9’-1”			175	145	122	104	89	78	68	60	54

Notes:
1. Load tables are calculated using section properties based on the steel design thickness
shown in the Steel Deck Institute (SDI) design manual.
2. Loads shown in the shaded areas are governed by the live load deflection not in excess of
1/240 of the span. A dead load of 10 psf has been included.