What sits between the beams matters.
Direct answer: Wire decking is the default for pallet racking: it lets sprinkler water through, keeps loads visible and presents a low fire load. Plywood decks are chosen when small or irregular items must not fall through, for heavy concentrated point loads, or where a solid surface is needed for manual picking — but they add combustible load and can hide beam damage, which is why insurers and fire authorities often require documented approval. Choose per bay, not per warehouse.
Where each deck fits
Wire decks let sprinkler water pass through, keep product visible from below and handle spills poorly only in the sense that small items may need support trays. They are the default in most distribution environments.
Plywood decks create a continuous surface for cartons, totes and irregular items, and they protect wood packaging from snagging. They add weight and, in sprinklered buildings, may trigger in-rack design changes.
Wire decking vs plywood vs steel decking
| Criterion | Wire mesh decking | Plywood decking | Solid steel decking |
|---|---|---|---|
| Sprinkler water penetration | High — water passes the mesh | None — acts as a shelf | None unless slotted |
| Fire load added | Very low (steel) | High — timber is combustible | None |
| Item fall-through | Small items can drop; needs a finer mesh | None | None |
| Load visibility from below | Good — damage and misplaced pallets are visible | Poor — hides beam deflection | Poor |
| Typical use | Standard pallet racking, cartons and totes | Small parts, manual picking, heavy point loads | Heavy concentrated loads, drum storage |
| Insurer / fire authority view | Usually accepted without conditions | Frequently requires written approval | Accepted, but check sprinkler design |
FAQ
Does wire decking flake or rust?
Quality decks are galvanized or powder-coated; surface rust can appear in wet or cold-store conditions, so inspect after any washdown or leak.
Can I mix deck types in one bay?
Mixing is possible but complicates load ratings and audits. Most operators standardize per zone to keep inspections simple.
What checks belong in a decking inspection?
Look for flipped channels, bent waterfall edges, and decks resting on damaged beam steps. Any deck that does not seat flat should be replaced, not straightened.
All figures above refer to standard product data sheets; final confirmation is subject to written quotation.