Most racking advice assumes a roof, four walls and a dry slab. Plenty of Singapore operations do not have that. Steel, timber, pipe, cable drums and heavy plant parts often live in a yard, under a canopy or against the outside wall of a shed, and the racking has to live there too. The question is not whether racking can go outdoors. It is which of the assumptions behind an indoor design stop being true once it does, and who has checked each one.

This is a buyer's checklist for that situation: what changes, what to ask for in writing, and where a quote that reads like an indoor quote should make you stop.

Covered is not the same as sheltered

A roof over the yard keeps the sun and the vertical rain off. It does not automatically keep out rain blown in from the side, splash from the slab, or the humidity that settles on steel overnight. Before anything else, decide which of three situations you are actually in, because each one asks for a different specification:

• Inside a building, open-sided or loading-bay end. Mostly indoor conditions with an occasional wet edge near the opening.
• Under a canopy or shed roof, open on one or more sides. Dry from above, exposed from the side. Wind and blown rain reach the racks.
• Fully open yard. Rain, sun, wind and standing water reach the steel and the load.

Tell the racking supplier which one it is, and how far the nearest open side is from the first bay. A supplier who only asks for pallet weight and bay count has not yet understood the job.

The finish is the first thing to check, in writing

The standard finish published on our racking systems page is powder-coat. Cold-rolled sections are zinc-plated before the powder-coat goes on, and hot-rolled sections in the Super Heavy-Duty tier are shot-blasted and primed before the topcoat. That is the standard specification and it is written for ordinary warehouse conditions. The same page lists a galvanised option against cantilever racking, marked for indoor or outdoor use.

Two things follow. First, do not assume the standard finish is the outdoor finish. If the racks are going into a yard, ask for the finish by name, for every component in the quote: uprights, beams, arms, bracing, base plates and the fixings. Second, the galvanised option is published for cantilever only, so for any other system used outdoors, the finish is a quotation question, and the answer belongs in the quote, not in a phone call.

Ask a follow-up as well: what happens at the cut, drilled or welded points? Any steel that is cut or drilled after it has been coated has bare edges. A good answer explains how those edges are treated on site. A vague answer is worth writing down.

Water, slabs and where the base plates land

Yard slabs are often laid with a fall so that water runs to a drain or a channel. That is right for the yard and awkward for a rack, because a frame wants to stand plumb and an upright on a sloping slab needs packing under the base plate. Ask how the frames will be levelled and what the packing is made of, because packing is one more place where water sits.

Drain channels, gratings, joints and slab edges are also the places an anchor is weakest, and yards have more of them than warehouses do. Our note on anchoring racking to the floor covers why anchors near a free edge or joint lose capacity. Outdoors the same checks apply with one more question added: where does water collect around each base plate, and how are the plate and anchor protected there?

If the yard slab is old, ask whether anyone has confirmed its thickness and condition. A slab that has carried lorries for years is not necessarily one that suits new point loads under upright frames.

Wind is an engineering question, not a rule of thumb

Indoor racking is protected from wind by the building. Racking in an open or part-open yard is not, and a run with tarpaulins, sheeting or light, bulky goods can catch wind far more than the same run indoors. Nothing here gives a wind figure, because that depends on the site and the design, and it is for the engineer to answer. What you can do is ask two direct questions: was wind considered in the design of these frames, and is that stated in the design documents you will be given? If the honest answer is that the design is the standard indoor one, that is worth knowing before the racks are loaded.

It is also worth asking what is stored on the racks when they are empty or part-loaded, since an empty bay behaves differently from a full one. Do not leave that to be discovered in bad weather.

What is stored changes what the rack has to survive

Steel bar and pipe sit differently in the rain from timber, and both sit differently from cartons, which do not tolerate wet at all. Ask yourself four things before choosing the system:

• Does the stock rust, swell, stain or delaminate when wet, and does it need covering regardless of the rack?
• Does stock sit directly on steel arms or beams, and could water pool where it rests?
• Does anything need to be tied down or covered, and can the racks carry that cover without becoming a sail?
• Is the load long or round? If so, the choice between cantilever and pallet racking is where you begin, not something to settle afterwards. Our guide to when cantilever racking is actually needed sets out the loads that call for it. Cantilever has no published price, so cost is quote-only after a site survey.

Yard traffic is harder on racking than warehouse traffic

Yards tend to mean lorries, forklifts working on wet surfaces, and longer runs with fewer walls to guide a driver. Impact damage is the main enemy of racking on our own published figures: our racking page states that the limiting factor on service life is usually forklift impact, not corrosion, and that 20 to 25 years is normal for racking that is properly specified, installed and maintained. That statement is about ordinary use. It should not be read as a life guarantee for racking left in an open yard, and a yard is a good place to be generous with protection. See column guards, barriers and where they are worth fitting.

Inspection matters more outdoors, and corrosion is on the list

Our rack inspection service looks at uprights and bracing for bend, split or corrosion, among other checks. For racking outdoors, corrosion is the item that moves up the list. Ask for the first inspection to be booked at handover rather than waiting for a problem, and keep the report with the design documents. What gets flagged, and how findings are triaged, is covered in what a rack inspection flags under SS EN 15635.

Your landlord, the lease and any approvals

A racking structure in a yard is not the same as racking inside a unit. Before ordering, read your lease for any restriction on fixed structures outside the unit and on drilling the yard slab, and ask your landlord in writing. Whether a particular outdoor structure needs an approval from an authority depends on the structure and the site, so ask your racking designer to state it in the quotation, and check with the Building and Construction Authority (BCA) if you are unsure. Do not assume that because a rack is "only racking" no approval question arises.

Ten things to get in writing before you order

1. Which of the three exposure situations the quote assumes (inside, sheltered on some sides, open yard).
2. The finish for every component, including base plates and fixings.
3. How cut, drilled and welded edges are treated on site.
4. How frames are levelled on a sloping slab and what the packing is made of.
5. Where each base plate lands relative to drains, joints and slab edges.
6. Whether wind was considered in the design, and where that is stated.
7. What the racks are designed to carry when they are empty or part-loaded.
8. Impact protection at aisle ends and corners where lorries and forklifts turn.
9. When the first inspection happens and who keeps the report.
10. Whether the lease allows the structure and the drilling, confirmed by the landlord.

The short version

Racking in a yard is racking with more questions attached. The frames may look like the ones in a warehouse, but the finish, the slab, the wind, the traffic and the inspection all need a written answer. Where a quote only lists bays and load classes, ask for the rest. Pricing follows a site survey, and the survey should be done in the yard itself, not from a floor plan.

If you want a second opinion on an outdoor or yard quote, or a survey before you order, message us on WhatsApp or see our racking systems page for the systems and published bay ranges.