Steel Bar Truss Floor Decking: The Complete Buyer's Guide

If you are planning a multi-storey steel structure building - a warehouse, factory, office tower, or parking garage - you have probably come across steel bar truss floor decking in the specifications. It has become the default choice for composite concrete floors worldwide, replacing traditional timber formwork and rebar installation on site.

But buyers often ask us the same questions: What exactly is it? What thickness and specs do I need? And how do I find a reliable manufacturer at a reasonable price?

This guide answers all of them, based on what we at KEXINDA (Tianjin) Industrial Co., Ltd. have learned over 20+ years of producing truss decking for projects in more than 20 countries.

What Is Steel Bar Truss Floor Decking?

Steel bar truss floor decking (also called steel truss deck or truss decking) is a prefabricated composite floor element. It consists of:

A bottom steel sheet - galvanized, acts as permanent formwork

A welded steel bar truss - the top chord, bottom chords and diagonal web bars are factory-welded into a truss that replaces on-site rebar

Cast-in-place concrete - poured on site, bonding with the truss to form a composite slab

Because the rebar work is already done in the factory, the truss deck arrives on site ready to lay. Workers simply position the panels, pour concrete, and the floor is finished. No formwork stripping, no rebar tying, no scaffolding under the floor (for most typical spans).

5 Key Advantages Over Traditional Corrugated Floor Decking

For projects in high-speed rail stations, airports, logistics parks and high-rise industrial buildings, this speed and span advantage translates directly into money saved on labor and construction time.

How to Choose the Right Specifications

When requesting a quote for truss deck, your supplier needs four inputs. Here is a quick checklist you can use:

Slab span and load requirements - determines the truss height (typically 70–270 mm) and bar diameters.

Slab total thickness - commonly 100–160 mm for standard buildings.

Bottom sheet requirements - galvanized steel sheet, typically 0.4–0.6 mm; the sheet is permanent formwork and does not count in structural calculations.

Fire rating requirements - truss decking achieves up to 1.5–2 hours fire resistance depending on slab thickness and rebar cover.

A professional manufacturer will run the span tables for you and propose the most economical truss configuration - not the most expensive one.

Watch Out: 4 Quality Checks Before You Order

Not all steel truss deck manufacturers are equal. Before you place an order, verify:

Raw material certificates - steel should be Q235B/Q345B or equivalent (S235/S355), with mill certificates for every batch.

Zinc coating weight - for humid or coastal environments, request a minimum Z275 galvanizing on the bottom sheet.

Welding quality - the truss webs must be resistance-welded at every node. Ask for shear-test reports.

Customized cutting - panels should be cut to your exact span minus joint allowance, numbered by drawing, and bundled in installation sequence. This single detail saves days on site.

Why Source Truss Decking from a Chinese Manufacturer?

China produces the majority of the world's composite floor decking, and mature manufacturers like KEXINDA offer clear advantages:

Factory-direct pricing - with 16 floor decking production lines, we produce in volume and pass the savings to buyers

Full spec support - our engineering team provides span calculations and shop drawings before production

Export experience - products sold to more than 20 countries with proper seaworthy packaging and container-loading plans

One-stop supply - pair your truss decking with galvanized C/Z purlins, sandwich panels and corrugated roofing from the same supplier, and consolidate everything in one shipment

Frequently Asked Questions

Q: What is the MOQ for steel bar truss floor decking? A: For standard specs, MOQ is flexible for trial orders; custom truss configurations are produced to drawing.

Q: How is truss deck shipped? A: Panels are bundled, strapped and loaded into containers or break-bulk vessels, packaged according to regional project requirements.

Q: Can you match my local design codes? A: Yes - provide your structural drawings and we adjust truss geometry, bar diameter and slab thickness to your code requirements.

Get Your Free Quote in 24 Hours

KEXINDA has manufactured steel bar truss floor decking since 2003 as a national high-tech enterprise with ISO9001/14001/45001 certifications. Send us your floor plans or span requirements, and our engineers will reply with a full technical proposal and factory price within one working day.

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