Archive Storage Shelving Singapore: Boxes, Aisles, Load

Archive shelving carries the heaviest load a light shelf ever sees, and the problem usually lands on the floor rather than on the steel. An office floor is designed for around 2.5 kN/m2, while dense storage calls for 5 to 7.5 kN/m2 under SS EN 1991-1-1. This blog walks you through box sizes, aisle access and floor loading, starting with the storage and racking systems behind it.

What is archive storage shelving and what makes it different?

Archive storage shelving holds document boxes and records cartons in high density for long term retention. You load it by hand, level after level, and you fill it far more often than you empty it.

The weight is what catches people out. A standard archive box looks small, and full of documents it weighs 15kg to 20kg, so a bay packed five or six levels high concentrates several hundred kilos of paper into less than half a square metre of floor.

Retention shapes the layout. Law firms, clinics, accountants and contractors keep records for years and pull them a handful of times, so the design leans toward boxes per square metre instead of the wide aisles a busy pick face needs. The right shelving type is usually a boltless or light longspan unit rather than a rack.

Decide first whether the archive belongs in your unit at all. A records centre charges by the box and by the retrieval, while an in-house room costs you rent on the floor plus the shelving, so the crossover depends on how many boxes you hold and how often somebody needs one back the same afternoon. Files you touch monthly stay in house. Dead records that nobody has opened in five years are usually cheaper offsite.

Once the archive is staying, plan it around the floor and the box. The shelving itself is the straightforward part of the project.

What size are archive boxes, and how many fit per shelf?

A standard archive box measures about 400mm x 320mm x 260mm, and a 900mm wide shelf takes four to six of them depending on how you turn them. That one box dictates the shelf depth, the boxes per level and the vertical pitch.

Orientation changes the count. With the 320mm face out, a 900mm shelf holds four boxes across. Turn them so the 260mm face shows and you fit more per row, though each box then sits deeper into the shelf, so read the width and depth together against the box rather than one at a time.

A 400mm deep shelf clears the box with enough room to slide it in and out, which is the same exercise as matching shelf depth and level spacing on any storage run.

Pitch the levels off the box height. A 260mm box wants roughly a 300mm gap so someone can lift it clear, which gives six archive levels in a 2m bay. Squeeze the pitch to steal a seventh level and every retrieval becomes a two handed fight with the box above it.

Measure the awkward tenth of your archive before you order. Lever arch files stood upright, bound ledgers, rolled drawings and sample boards all refuse to sit in a standard carton, and they usually end up stacked on the floor of a room designed entirely around one box size. Give them their own bay at a deeper pitch.

Can my office floor take the weight of archive storage?

Often not, and not without checking. Under SS EN 1991-1-1 and its Singapore National Annex, an office floor is designed for around 2.5 kN/m2, while a storage area is rated at 5 to 7.5 kN/m2, so a room of tightly packed archive can cross that line on its own.

Run the arithmetic before anyone quotes you shelving. Take a 900mm by 400mm bay, six levels, five boxes a level at 17.5kg: about 525kg, or 5.15 kN, sitting on 0.36 square metres of floor. Share half an aisle across it and you are still at roughly 6.7 kN/m2, which is two and a half times what a general office floor was designed to hold.

Upper floors are where this bites. A ground slab on piles absorbs almost anything, while an upper floor is limited by what the slab and columns carry, and dense archive can double the imposed load the designer allowed for.

Treat the number above as a screening test and nothing more. Where the archive load approaches or passes the floor rating, a professional engineer assesses the slab and either endorses it, calls for load spreading, or sends the storage to a stronger floor, because SS EN 1991-1-1 leaves concentrated storage loads to be worked out case by case. The shelf carries its own separate per level limit under SEMA’s shelving load guidance.

Have the numbers ready and the assessment moves quickly. The engineer wants a layout drawing with the bay positions and aisle widths, the boxes per bay, the weight you are using per box, and the level the room sits on. Guessing any of those turns a short review into a site visit and a second round of questions.

How wide do the aisles need to be for archive shelving?

As narrow as your retrieval rate allows. A dead records store can run aisles barely wider than a person, while an active records room needs space for someone and a trolley.

Put numbers on it early. Around 600mm to 700mm lets one person stand side on and pull a box from a shelf. Push past 900mm and you are buying trolley access, which is worth it in a room worked daily and wasted in a store opened twice a year.

Every millimetre of aisle is floor you pay rent on and store nothing in. Narrowing the aisles packs more shelving into the same room, at the cost of slower retrieval and no trolley, so set the width against how often your team actually goes in.

Keep the route out clear whatever you decide. An archive room aisle doubles as the way out of it, so the run stops short of the door swing, nothing gets stacked in the gangway during a filing push, and the last bay of a run leaves enough space to turn at the end.

Is mobile or compactus shelving worth it for archives?

For low retrieval archive, yes. Mobile shelving removes the fixed aisles that cost static shelving 35 to 40 percent of its floor area, and it roughly doubles the boxes you store in the same room.

A bank of mobile compactus shelving closes up and opens a single aisle only where someone is retrieving, so a floor that held ten static bays takes close to eighteen mobile ones. Archives fit the profile exactly: the stock sits still for years and gets pulled rarely.

Installation asks more of the floor than static shelving does. The rails need a flat, level surface to run true, and you either surface mount them with a ramp at each end or recess them into the screed, which depends on how much screed you have to cut into.

The floor question gets harder as well. More boxes per square metre raises the distributed load, and the wheels running on rails concentrate a high point load along every track, so a mobile archive needs the slab assessed more carefully than a static one.

Choose between manual and handle driven operation on the weight, not the price. A loaded archive bay is heavy to push by hand, and a geared handle turns that into something one person can move without leaning into it. Specify aisle safety locks at the same time, so a bay cannot be wound closed while somebody is standing between the runs.

How do you protect archives from humidity and dust in Singapore?

Keep the room dry and ventilated, the boxes off the floor, and use decks that resist damp and pests. Ambient humidity here sits around 80 percent, which is high enough to grow mould and cockle paper over the years a record sits in storage.

Damp does the damage slowly. Paper stored against a cold slab or an external wall draws moisture and grows mould, so nothing goes on the floor and the lowest shelf sits clear of it. Ventilation alone rarely holds a closed store at the 50 to 60 percent relative humidity paper keeps best in, which is what a dehumidifier is for.

Look up before you settle on the room. Aircon condensate trays, chilled water pipes and the odd roof detail all drip, and a records store is the last room anyone checks after a wet week.

Pick the deck and the housekeeping for the environment. A steel or coated deck wipes clean and gives silverfish nothing to live in, unlike a raw board, and a lidded box keeps the dust off contents that sit untouched for years.

How should archive boxes be labelled for retrieval?

Give every box a unique code that maps to a shelf location, so anyone can find a record from the code instead of from memory. A dense archive with no location system turns into a room nobody can retrieve from.

Use the same aisle, bay and level addressing any warehouse uses. Number each box, record its address against the code, and a request resolves to one exact shelf rather than a rough corner of the room.

A barcode and a spreadsheet cover most archives under a few thousand boxes. Record the retention or destruction date in the same row as the location, and the archive starts shrinking on schedule instead of growing until the room runs out.

Label at the point of boxing rather than afterwards. A box sealed and carried into the room without a code gets a code invented for it later, from a lid nobody can read, which is where most archive indexes start going wrong.

Label the shelving as well as the boxes. Aisle and bay markers on the end frames, level markers on the uprights, and your team finds an address without counting bays down a dark run.

Good addressing is what makes tight aisles and mobile shelving workable. Your team walks straight to the address, while an unlabelled dense store stays slow no matter how it was built.

Planning an archive layout the floor can carry

Archive shelving looks like the simplest thing in a warehouse and puts the heaviest load a light shelf ever sees onto the floor. A full box runs 15kg to 20kg, dense archive can push a floor past the 2.5 kN/m2 an office was designed for, and every choice about aisles and mobile shelving trades density against retrieval speed. Size the shelf to the box, set the aisle to the retrieval rate, and get the floor checked first.

Send us your box counts, the floor level and how often you retrieve, and we will design an archive shelving layout the floor can carry. Request an archive storage plan.

Frequently asked questions

How much does a full archive box weigh?

A standard archive box of about 400mm x 320mm x 260mm weighs 15kg to 20kg when full of documents, because paper is dense. That weight turns archive storage into a floor loading question: a bay six levels high concentrates well over 100kg of paper into a small footprint, which an office floor rated for 2.5 kN/m2 may not carry.

How many archive boxes fit on one shelf?

A 900mm wide shelf holds four to six standard archive boxes depending on how they face, and a 2m bay carries about six levels, so one bay stores roughly 24 to 36 boxes. The count depends on the box orientation and the shelf depth, which is why the shelf gets sized to the 400mm x 320mm x 260mm box.

What floor loading do I need for an archive room in Singapore?

Dense archive storage calls for a floor rated at 5 to 7.5 kN/m2 under SS EN 1991-1-1 and its Singapore National Annex, well above the 2.5 kN/m2 a general office floor is designed for. Have a professional engineer assess an upper floor archive, since the standard expects stacking density and height to be worked out for the actual layout.

Is mobile shelving better than static shelving for archives?

For archives pulled rarely, yes. Mobile compactus shelving removes the fixed aisles that cost static shelving 35 to 40 percent of the floor, which roughly doubles capacity in the same area. The trade is a higher load per square metre plus point loads along the rails, so get the slab assessed before installation.

What shelf depth suits archive boxes?

A 400mm deep shelf suits the standard 400mm x 320mm x 260mm archive box and clears it with room to slide the box in and out. Pitch the levels at around 300mm to clear the 260mm box height with a hand gap, which gives about six archive levels in a 2m high bay.