3" Composite Floor Deck

Normal Weight Concrete (145 pcf)

3" Composite Deck is a composite floor deck profile, available in both 24" and 36" widths. It is meant to be used as a floor deck where concrete is to be poured on top of the deck. The web in the deck contains indentations, which allow for better bonding between concrete and deck, and therefore forms the Composite Deck. Temporary shoring may be required during construction, depending on span and slab depth. Consult the catalog for spans where shoring is required. 3" Composite comes roll formed to any custom length required and has an interlocking side lap. 3" Composite Deck also installs alongside a full range of deck accessories, covering everything from closures to fasteners needed to finish the system.

Available in 24" & 36" Widths

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JumpLinks 3" Composite Deck Properties Available 3" Composite Deck Slabs

3" Composite Deck Specs and Material Options

3" Composite Deck is manufactured in gauges ranging from 22 to 16, with heavier gauges providing greater unshored span capability and load capacity. Gauge selection directly affects design thickness, weight, and moment of inertia, all of which are detailed in the section properties below so you can confirm the right fit for your project before ordering. This profile is available in the following material options:

Galvanized steel, G60 and G90
Stainless steel, T304 and T316, for caustic environments

Stainless steel decks hold up in high-moisture or corrosive environments where extended exposure would otherwise be a concern, making them a preferred choice for exposed applications. Both types 304 and 316 are available depending on the corrosive elements.

3" COMPOSITE DECK PROPERTIES

Section Properties (Fy=40 ksi)

Gage	Design Thickness	Weight (psf) Glv	Ip(In4)	In(In4)	Sp(In3)	Sn(In3)
22	0.0295	1.75	0.7744	0.7467	0.4182	0.4584
20	0.0358	2.03	0.9659	0.9396	0.5315	0.5634
18	0.0474	2.75	1.2947	1.2659	0.7474	0.7548
16	0.0598	3.5	1.6351	1.5984	0.9869	0.9558

Common Uses for 3" Composite Floor Decking

Long spans and high load capacity are what make 3" Composite Deck the right call on projects where a shallower profile would fall short. Between its deep rib, interlocking side lap, and two available materials, it covers commercial floors, parking structures, and corrosive environments without needing a different product for each.

Mid-Rise and Commercial Floor Systems

Because of its deep rib profile, 3" Composite Deck holds up over longer spans between structural steel supports than shallower profiles allow, meaning less framing is needed to carry the same floor. It is a common choice for office buildings, retail spaces, and other commercial structures with wide open floor plans and generous column spacing.

Parking Structures and Garages

The load capacity and long span of 3" Composite Deck make it well suited to parking structures, where vehicle loads and wide bay spacing demand a deeper profile. Stainless steel is worth considering here given the exposure to deicing salt and weather.

Corrosion-Resistant Facilities

Water treatment plants and food processing operations are common settings for stainless steel 3" Composite Deck, where standing moisture, washdown chemicals, and daily chemical exposure would wear down a standard steel deck over time. The composite bond with concrete stays intact under these conditions, giving the floor system a long service life without the material breaking down underneath it.

AVAILABLE 3" COMPOSITE DECK SLABS

Slab Depth	Gage	Max Unshored Clear Span			Superimposed Live Load in Pounds Per Square Foot
Slab Depth	Gage			One	Two	Three	9'-0"	9'-6"	10'-0"	10'-6"	11'-0"	11'-6"	12'-0"	12'-6"	13'-0"	13'-6"	14'-0"
5.5”	22	7’-10”	7’-5”	7’-9”	202	177	156	138	123	109	97	86	77	69	61
	20	9’-0”	10’-7”	11’-0”	247	218	193	172	153	137	122	110	99	89	80
	18	10’-11”	13’-2”	13’-8”	327	289	257	230	206	185	167	151	136	124	112
	16	12’-9”	14’-9”	15’-3”	400	361	322	288	259	234	212	192	174	159	145
6.0”	22	7’-6”	6’-10”	7’-1”	234	206	181	161	143	127	113	101	90	81	72
	20	8’-7”	9’-9”	10’-2”	287	253	224	199	178	159	143	128	115	104	94
	18	10’-5”	12’-7”	13’-1”	378	335	298	267	239	215	194	175	159	144	131
	16	12’-2”	14’-2”	14’-8”	400	400	373	335	301	272	246	223	203	185	169
6.5”	22	7’-2”	6’-4”	6’-7”	268	235	208	184	164	146	130	116	104	93	83
	20	8’-3”	8’-12”	9’-4”	328	289	256	228	204	182	164	147	133	120	108
	18	9’-12”	12’-2”	12’-7”	400	384	342	306	274	247	223	202	183	166	151
	16	11’-7”	13’-7”	14’-1”	400	400	400	384	345	312	283	257	234	213	195
7.0”	22	6’-12”	5’-10”	6’-1”	302	266	235	209	185	165	148	132	118	106	95
	20	8’-0”	8’-4”	8’-8”	370	327	290	258	231	207	186	167	151	136	123
	18	9’-8”	11’-8”	12’-1”	400	400	387	346	310	280	253	229	208	189	172
	16	11’-3”	13’-2”	13’-7”	400	400	400	400	391	354	321	291	265	242	222
7.5”	22	6’-10”	5’-6”	5’-9”	338	298	263	234	208	185	166	148	133	119	107
	20	7’-10”	7’-10”	8’-1”	400	366	325	289	259	232	208	188	169	153	138
	18	9’-5”	11’-3”	11’-8”	400	400	400	387	348	314	283	257	233	212	193
	16	11’-0”	12’-8”	13’-2”	400	400	400	400	400	397	360	327	298	272	249

Custom 3" Composite Deck Supplier for Commercial Projects

We supply and distribute 3" Composite Deck in every gauge, in galvanized and stainless steel, roll formed to the custom length your project requires rather than fixed standard runs. If your floor system doesn't call for the added depth and load capacity 3" Composite Deck provides, our 2" Composite Deck is a more economical option worth considering.

Request a Quote for 3" Composite Deck

Have a commercial floor system in mind? Contact our team with your gauge, material, and length requirements, and we'll put together an accurate quote for your project. Still working through the design? Our 3D Building Design Tool lets you map out the full structure before you commit to specifications.

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FAQs

Does 3" composite deck require shoring?

Shoring requirements come down to three factors: span length, gauge, and slab depth. Based on the specifications above, unshored clear spans on 3" Composite Deck range from under 6 feet in 22 gauge up to nearly 15 feet in 16 gauge, depending on slab thickness. If your span falls within these limits, temporary shoring typically is not needed during the pour. For longer spans or thicker slabs, check the load tables above against your project's engineering requirements.

What is the difference between 2" and 3" composite deck?

The primary difference is rib depth, which determines how far each profile can span and how much load it can carry. 3" Composite Deck spans farther and supports greater loads, making it a better fit for heavier floors and longer bays between supports, while 2" Composite Deck is often the more economical choice for standard spans that don't need the added depth.

Is composite metal deck available in stainless steel?

Yes, 3" Composite Deck is available in stainless steel, both T304 and T316, in addition to galvanized steel. Stainless steel is the right choice for projects in corrosive environments, such as food processing or water treatment facilities, where standard galvanized coatings would deteriorate over time.

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