Factory-direct steel gratings & stair treads, shipped worldwide
Open Steel Flooring
Steel flooring made to order. Welded or press-locked, HDG finish.
Itemized quote within 24 hours · Free drawing review included
In-house weld & press lines
Open flooring welded or press-locked under one roof
Certified & tested
Reports on request, MTC with every order
Samples in 5–7 days
Production in 15–25 working days
FOB Tianjin
Shipped worldwide, EXW / CIF negotiable
Construction comparison
Open Mesh vs Close Mesh vs Solid Plate
Open steel flooring is a design decision, not just a product. Whether buyers call it open flooring, metal grill flooring or open mesh, the decision is the same: how much opening your application can tolerate. The table below is the specifier version of that decision — including the honest case where an open floor is the wrong answer and close mesh takes over.
| Dimension | Open Steel Flooring | Close Mesh | Solid Plate |
|---|---|---|---|
| Rain & spills | Pass straight through — nothing pools on the walking surface | Passes through; fine solids are caught by the tighter grid | Pools and must be sloped or drained away |
| Snow & ice | Sheds through the grid; little build-up underfoot | Sheds through, more slowly | Collects on top until cleared — slip risk |
| Ventilation & light | Air, heat and daylight move freely through the floor | Partial airflow through narrow gaps | None — traps heat and fumes underneath |
| Steel per area | Least steel of the three — the openings do part of the work | Middle — more bars, still lighter than plate | Most — a full steel section per square metre |
| Small solids | Fasteners and debris fall through — plan what is below | Catches most small solids while draining | Nothing falls through |
| Underfoot grip | Serrated bearing bars optional for wet or oily duty | Serrated or plain; heel-proof for public traffic | Needs a raised pattern or coating for grip |
| Dengtai supply | In-house — electro-forging welded line | In-house — press-locked, down to 11/11 mm centers | Not a stock line — we say so in the quote |
Unsure which construction suits your loads and what sits beneath the floor? Send your drawings — we will spec it inside the 24-hour quote.
The open-construction argument
What an Open Floor Does for a Plant
1 · Ventilation and daylight
Openings between bearing bars let heat, fumes and steam rise through the floor instead of building up below it — and daylight reach the level underneath. On mezzanines and multi-level plants that is free ventilation.
2 · Spill, rain and snow pass-through
Water, oil and washdown liquid fall through the grid to the drain or ground below. The walking surface stays dry and visible, and outdoors there is no ponding and far less ice to manage in winter.
3 · Weight versus solid plate
An open grid carries the same duty class with a fraction of the steel of a solid plate — less dead load on your structure, easier handling on site, and lower material use for the same covered area.
Why specify open
Why Specifiers Choose Open Steel Flooring
Anti-slip, all-weather footing
Serrated bearing bars give grip in rain, oil and washdown zones, and the open surface never holds a film of standing water. A drier step is a safer step.
Heavy duty without plate weight
Bearing bars from 20×3 mm up to 100×8 mm take wheel and point loads on an open grid — load tables on request, so you specify by span and duty, not by guesswork.
Factory-direct, custom to drawings
Open steel flooring made to order — cut and banded to your drawings, hot-dip galvanized to ASTM A123, small trial orders welcome. Samples in 5–7 days before you commit.
Applications
Where Open Steel Flooring Earns Its Keep
Anywhere water arrives, heat rises, or the level below needs light — an open floor solves three problems at once.
Platforms & mezzanines
Ventilated decking lets heat and fumes rise through instead of collecting under the walk level.
Outdoor walkways & catwalks
Rain and snow fall straight through — no ponding, far less ice, no drain channels to clean.
Wet & washdown process floors
Spills drain straight through to the trench below — the floor itself never becomes the problem.
Stair treads & landings
Open treads with serrated surfaces — snow and water drop off the leading edge instead of riding the stair.
The honest counterpoint
When Solids Must Not Fall Through
Open steel flooring is a poor choice for floors above occupied spaces, clean rooms, live equipment or anything that small parts could damage below. The fix is not a solid plate — it is a closer grid. Press-locked close mesh keeps the drain-through character while shrinking the openings until fasteners, debris and heels stay on top.
Keep open mesh when
- Water, oil or washdown has to leave the walking surface fast
- Heat, fumes or steam should rise through the floor
- The floor sits outdoors over ground or an open pit
- Structure weight and steel use matter to the design
Switch to close mesh when
- People or live equipment sit below the floor level
- Small parts, tools or product must stay on the surface
- Public traffic in street shoes needs heel-proof openings
- The floor is indoors, where most debris should not drop through
Specifications
Open Steel Flooring Specifications
| Parameter | Range |
|---|---|
| Construction | Welded (bearing + cross bars) or press-locked |
| Bearing bar | 20×3 mm to 100×8 mm, plain or serrated |
| Bar spacing | 30 / 40 / 60 mm centers; close mesh to 11/11 mm |
| Panel width | Up to 1.25 m |
| Panel length | Up to 6 m |
| Materials | Q235B carbon steel · SS304 / SS316 stainless |
| Surface | Black or hot-dip galvanized (ASTM A123 / ISO 1461) |
| Custom sizing | Cut and banded to your drawings |
Materials & test documents
Every heat of Q235B, SS304 or SS316 enters production with its mill test certificate verified at goods-in — the first of our five QC stages. Panels leave with documentation, not promises:
- Mill test certificate to EN 10204 Type 3.1
- Factory inspection report with every shipment
- Declaration of Conformity prepared per order destination
Standards & compliance
Produced to Recognized Standards — Documents on Request
ANSI / NAAMM MBG 531
Welded open flooring produced to MBG 531 reference practice, with weld checks on the five-stage QC plan.
ASTM A123 / ISO 1461 HDG
Outdoor open flooring is hot-dip galvanized as standard; coating thickness is sampled on every galvanized batch.
CE & SGS tested
Certified & tested, reports on request — we show documents you can verify, not a certificate wall.
Custom made
Open Floors, Cut and Banded to Your Drawings
Send your floor layout
Panel sizes, support spacing, duty class, quantities — or just photos and a sketch. Drawing review is free.
Quote within 24 hours
Itemized, FOB Tianjin as standard — EXW or CIF on request. Small trial orders welcome.
Samples in 5–7 days, production in 15–25
Working days after drawing confirmation, hot-dip galvanizing included. Installation drawings and fixing layout ship with the order.
Factory-direct quote
Get a Factory Quote
Get a factory quote in 24 hours. Steel flooring, treads & covers in one order — tell us the area, the duty and what sits below the floor, and we spec the mesh with it.
- Five-stage QC, from MTC verification at goods-in to final inspection
- DoC, MTC EN 10204 3.1 and inspection report with every order
- Factory audits welcome — see the lines before you commit
Prefer to talk? WhatsApp us or sales@dtsteelladder.com
Request your quote
Five fields — we do the rest.
FAQ
Frequently Asked Questions
What is open steel flooring?
Open steel flooring is a floor built from steel bearing bars and cross bars joined into a grid, with clear openings between them. Rain, spills, air and light pass straight through instead of pooling on the surface, and the open grid uses less steel than solid plate. Panels are welded or press-locked and usually hot-dip galvanized.
When should I specify close mesh instead of open flooring?
Choose close mesh when small solids must not fall through the floor, or where public traffic in street shoes needs heel-proof openings. Press-locked close mesh reaches 11/11 mm centers while keeping most of the drainage and ventilation of an open floor.
What is the lead time for open steel flooring?
Samples ship in 5–7 working days and mass production runs 15–25 working days after drawing confirmation, both including hot-dip galvanizing. Rush production in 10–15 days is possible with a surcharge — ask in your quote.
Related pages
Related Flooring & Grating Pages
Open Steel Grating
Open construction benefits: weight savings and rain or snow shedding.
View page →Open Grid Steel Flooring
Grid orientation and load bars running in the direction of traffic.
View page →Metal Grid Floor
Open-grid drainage flooring for wet and process areas.
View page →Floor Grating
Flooring duty: load direction, deflection and foot traffic.
View page →Stainless Open Mesh Flooring
Drain-through flooring in SS304 / SS316 for hygiene areas.
View page →Grating Mesh
Mesh geometry: 30/40/60 mm centers and the 11/11 close-mesh option.
View page →