Most Singapore warehouses don't run on a single pallet size. You've got standard 1000×1200mm pallets from local suppliers, 800×1200mm Euro pallets from European importers, maybe some 1100×1100mm squares for specific SKUs, and the occasional custom footprint that nobody planned for but everyone has to live with. When clients come to us asking how to rack all of it without building three separate systems, we walk them through the same beam-level configuration we've been using since 2014: zone-based selective racking with adjustable beam heights per SKU group.

Why a Single Beam Height Across the Entire System Doesn't Work

The instinct is to pick one beam height — say, 1200mm vertical clearance — and apply it to every level across every bay. It's tidy on paper. In practice, it wastes between 15% and 30% of your vertical cube, depending on how much your pallet heights vary.

Here's what we see during site surveys: a 3PL operator stores 800mm-high pallets of electronics on the same beam level designed for 1400mm-high pallets of packaged furniture. The beam spacing is set to the tallest load, so every shorter pallet leaves a gap of dead air above it. Multiply that across 200 bays and you've lost the equivalent of an entire mezzanine level's worth of storage — space you're already paying rent on.

The other failure mode is the opposite: setting beam heights too tight to the most common pallet, then discovering that 20% of your SKUs don't fit. We've been called in to retrofit systems where operators were double-stacking pallets on the floor because the racks couldn't take the taller loads. That's not a racking problem — it's a configuration problem that should have been caught during layout.

The Zone-Based Beam Configuration We Actually Use

We divide the selective system into SKU zones within the same upright frame runs. Each zone is a group of bays dedicated to a specific pallet footprint and height range. The uprights stay continuous, but the beam levels adjust per zone to match the actual loads stored there.

Here's a real example from one of our Tuas projects: the client stored three pallet types — 1000×1200mm at 1100mm high, 800×1200mm at 900mm high, and 1100×1100mm at 1300mm high. We configured the layout as follows:

• Zone A (Bays 1–12): Standard 1000×1200mm pallets, beam spacing at 1200mm vertical clearance per level, four levels high.
• Zone B (Bays 13–20): Euro 800×1200mm pallets, beam spacing at 1000mm vertical clearance, five levels high (same upright height, tighter beam pitch, one extra level).
• Zone C (Bays 21–26): 1100×1100mm square pallets, beam spacing at 1400mm vertical clearance, three levels high.

All three zones shared the same 3000mm upright frames. The beams were the only variable. This gave the client 20% more pallet positions than a single-beam-height layout would have allowed, without adding a single millimetre to the building footprint.

How We Size Beams When Pallet Weights Vary Across Zones

Different pallet sizes often carry different weights. A 1000×1200mm pallet of canned goods might weigh 800kg. An 800×1200mm pallet of consumer electronics might weigh 300kg. A 1100×1100mm pallet of bagged cement might hit 1200kg. If you spec every beam to the heaviest load, you're over-engineering 80% of the system and inflating the material cost for no reason.

We size beams per zone, per load case. Zone A gets 100×50mm box beams rated for 1000kg UDL per pair. Zone B gets 80×50mm beams rated for 500kg UDL. Zone C gets 120×50mm beams rated for 1500kg UDL. Every beam specification is backed by a load calculation we run during the quotation stage, and every batch is PSB-tested with mill certificates available on request.

This approach also future-proofs the system. If the client's SKU mix shifts — say, Zone B starts storing heavier pallets two years down the line — we can swap out those beams without touching the uprights or re-doing the floor fixings. Selective racking's modularity is its biggest advantage, but only if you configure it with that flexibility in mind from day one.

Beam Depth and Pallet Overhang: The Part Everyone Forgets

A 1000×1200mm pallet sitting on a 2700mm-deep beam pair (front-to-back) has 750mm of clearance on either side. That's fine. An 800×1200mm pallet on the same 2700mm beam depth has 950mm of clearance — also fine, but you've now got 200mm of wasted depth per bay. Multiply that across 15 bays in Zone B and you've added 3 metres of unnecessary aisle width to the layout, which costs you two entire rows of racking.

We adjust beam depth per zone as well. Zone A (1000×1200mm pallets) gets 2700mm-deep beams. Zone B (800×1200mm pallets) gets 2400mm-deep beams. The upright frames stay at the same pitch, but the beam arms telescope inward. This keeps the aisle width consistent across the system and prevents the layout from ballooning.

There is one constraint: pallet overhang. We allow a maximum of 75mm overhang per side (150mm total) for standard selective racking. Any more than that and the pallet's unsupported edges start to sag under load, especially if the goods are unevenly distributed. If your pallet is 1200mm deep and your beams are only 1000mm apart front-to-back, that's 100mm overhang per side — outside our safe working limit. We'll either increase the beam depth or move that SKU to a different zone with appropriately sized beams.

Forklift Reach and Aisle Width When Zones Have Different Pallet Sizes

Your forklift doesn't care what size the pallet is — it cares about the load centre and the aisle width required to execute a 90-degree turn. A 1000×1200mm pallet picked up along the 1200mm edge has a 600mm load centre. An 800×1200mm pallet picked up along the 1200mm edge has a 600mm load centre. Same forklift, same aisle width.

But if you pick up the 1000×1200mm pallet along the 1000mm edge, the load centre shifts to 500mm, and the turning radius tightens. If your layout assumes every pallet is oriented the same way, and then your warehouse team starts rotating pallets to fit them into tighter spots, your aisle width is now under-spec'd and your forklift operators are three-point-turning to pick every load.

We verify pallet orientation per zone during the site survey. If Zone A pallets are always picked long-edge-forward and Zone B pallets are always picked short-edge-forward, we'll calculate two different aisle widths and adjust the layout accordingly. If the client can't commit to a consistent orientation, we spec the aisle to the worst-case turning radius — which is the safe call, but costs you floor space.

What We Tell Clients Who Want "Future-Proof" Mixed-Pallet Systems

There is no such thing as a racking system that fits every possible pallet size and weight without compromise. What we can do is build a system that's reconfigurable — where beams can be moved, swapped, or added without demolishing the uprights or re-doing the floor anchors.

Here's the checklist we use to maximise future flexibility:

• Upright frames sized to the tallest foreseeable load. If you think you might one day store 2000mm-high pallets, we spec 6000mm uprights now, even if you're only using four levels today. Adding a fifth level later is a two-hour job. Replacing every upright frame is a two-week shutdown.
• Beam holes at 50mm pitch. Standard on all our upright frames. This gives you 50mm vertical adjustment increments without custom drilling.
• Modular beam lengths. We stock 2100mm, 2400mm, 2700mm, and 3000mm beam pairs. If your SKU mix changes, we swap the beams — not the entire bay.
• Load test documentation for every zone. When you call us in three years asking if Zone B can now handle 800kg pallets instead of 500kg, we pull the original calculations, check the beam spec, and give you an answer in 24 hours — not a site visit and a two-week re-quote.

The One Scenario Where Zone-Based Selective Doesn't Work

If your SKU mix changes every week — say, you're a 3PL running short-term contracts with 15 different clients, each with different pallet sizes, and product rotation every month — zone-based selective racking becomes a permanent reconfiguration project. You'll spend more time moving beams than storing pallets.

In that case, we usually recommend a hybrid approach: a smaller selective system for stable, long-term SKUs, and a block-stacking or floor-storage zone for the high-churn, mixed-footprint overflow. It's not as space-efficient, but it's operationally realistic. We'd rather tell you that upfront than sell you a system that looks perfect on the layout drawing and becomes a nightmare six months in.

How We Survey and Quote for Mixed-Pallet Selective Systems

We don't quote mixed-pallet systems off an email with three pallet dimensions and a "how much?" question. We need to see the actual SKU breakdown — how many pallets of each size, their weights, their turnover rates, and their storage duration. We also need to know your forklift fleet (make, model, mast height, load centre), your floor slab condition (we'll check for cracks, levelness, and load capacity), and your ceiling height.

From there, we'll draft a layout that divides the system into zones, size the beams per zone, calculate the aisle widths, and verify that the floor can handle the point loads at the upright bases. The quotation includes the beam schedule (sizes, lengths, load ratings per level), the upright schedule (heights, frame depths, bracing), and the installation timeline. If the project needs a PE-stamped submission for the heavier-duty zones, we coordinate that as well.

The survey typically takes two hours on-site. The layout and quotation follow within a week. If you approve, fabrication lead time is three to four weeks (we cold-roll the uprights and beams in-house), and installation is usually completed within five working days for a standard 1,500-pallet-position system.

Frequently Asked Questions

Can I store 1000×1200mm and 800×1200mm pallets on the same beam level?

Yes, but only if both pallet types have the same weight and height, and your beams are deep enough to support the larger footprint without excessive overhang. We've done this on a few projects where the SKU mix was stable and the client wanted maximum flexibility, but it's not our default recommendation — you lose the vertical efficiency that comes from tighter beam spacing on the shorter pallets.

What's the smallest zone size that makes sense for a different pallet type?

We typically won't create a dedicated zone for fewer than four bays (eight pallet positions per level). Below that, the labour cost of custom beam sizing and the layout complexity outweigh the space savings. If you've got a small quantity of odd-sized pallets, we'll usually recommend floor-stacking them or storing them on a cantilever section if they're long goods.

Do I need to re-anchor the floor if I change beam configurations later?

No. The upright frames and floor anchors stay in place. When you reconfigure a zone — swapping 2700mm beams for 2400mm beams, or adjusting beam heights — you're only unbolting and re-bolting the beams to the upright frames. No floor work, no downtime beyond the beam-swap itself, which we can usually do outside operating hours.

How do you handle pallet sizes that are close but not identical — like 1000×1200mm and 1100×1200mm?

If the difference is within 100mm and the weights are similar, we'll usually configure both to the same zone with beams sized to the larger footprint. The 1000mm pallets will have slightly more clearance, but it's not enough to justify splitting them into separate zones. If the weight difference is significant — say, the 1100mm pallets are 40% heavier — we'll split them and size the beams accordingly.

Can this approach work with double-deep or drive-in racking?

Zone-based beam configuration works beautifully with double-deep racking — same principle, just deeper lanes. Drive-in is trickier because you lose the per-level adjustability (all pallets in a lane must be the same height), but we can still zone the system by pallet footprint. If you're running a mixed-pallet operation with high-density storage needs, we'd usually walk you through the trade-offs during the survey rather than assume one system fits all.

If you're planning a selective racking system for mixed pallet sizes and want a layout that actually matches your SKU breakdown and forklift fleet, send us your warehouse dimensions, pallet specs, and a rough idea of your storage volume. We'll survey the site, run the load calculations, and draft a zone-based configuration with a fixed-price quotation. WhatsApp us here to start.