Type “A” (Narrow Rib)Corrugated Metal Roof Deck

Type A (Narrow Rib) Roof Deck Description:

Type A (Narrow Rib) deck is designed to allow the use of the most economical insulation materials. it provides a maximum top surface contact area which is suitable for thinner rigid boards and the nest-able quality eliminates the need for die-set ends to reduce installation costs.

Certified by Steel Deck Institute

Classified by Underwriters Laboratories Inc.

Section Properties (Per Ft. of Width)

Deck Gage	Design Thickness In.	Weight Lbs. Per Sq. Ft.		“I” in.	“Sp” in.	“Sn” in.
Deck Gage	Design Thickness In.	Ptd.	Galv.	“I” in.	“Sp” in.	“Sn” in.
22	0.0295	1.75	1.97	0.130	0.113	0.113
20	0.0358	2.10	2.32	0.158	0.137	0.137
18	0.0474	2.80	3.02	0.210	0.181	0.181

Uniform Total (Dead & Live) Load – Lbs. Per Sq. Ft.

Span Condition	Gage	Span, Ft.-in.
Span Condition	Gage	4-0	4-6	5-0	5-6	6-0	6-6	7-0	7-6	8-0	8-6	9-0
Simple	22	93	73	59	49	41	35	30
	20	113	89	72	59	50	42	36	32
	18	149	118	95	79	66	56	48	42	36	32
Two	22	93	73	59	49	41	35	30
	20	113	89	72	59	50	42	36	32
	18	149	118	95	79	66	56	48	42	37	33
Three or More	22	116	92	74	61	51	44	38	33
	20	141	111	90	74	62	53	46	40	35	31
	18	187	147	119	98	83	70	61	53	46	41	36

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