Before You Add Heavy Equipment, Check the Floor Load

High-density storage was the issue on this project. The lesson applies to anything that puts concentrated weight where the building may not have been designed to carry it.

Originally published July 2011. Updated October 2026.

A high-density filing system looked like a good way to fit a large amount of storage into a small footprint.

Then we checked what it weighed.

On one project in a 1950s building, the proposed system had an operating weight of approximately 68,900 pounds concentrated over about 172 square feet.

The floor was rated at 100 pounds per square foot.

Suddenly, this wasn’t a furniture decision.

It was a structural decision.

High-density filing systems work by eliminating much of the aisle space required by conventional shelving. That can make them extremely efficient when a business needs to store a large quantity of records in a relatively small area.

It also means a considerable amount of weight can be concentrated in that area.

In our case, the proposed system was too heavy for the existing floor condition.

The Solution Wasn’t More Structure

We asked a structural engineer to evaluate what would be required to support the proposed system.

One potential solution was a series of steel beams below the slab designed to carry the additional weight. Because those beams would need to connect to existing columns and span considerable distances, they would have been deep and heavy.

That was technically possible.

But it wasn’t necessarily the best project decision.

We had another option:

Reduce the load.

We removed several levels of filing from the proposed system, substantially reducing its weight and avoiding the more significant structural intervention.

The Floor Plan Doesn’t Show Weight

The broader lesson goes beyond filing systems.

A floor plan can show that something fits in a room without telling the owner whether the structure can support it.

The same issue can arise with dense records storage, compact shelving, safes, specialty equipment and other installations that place significant loads in a relatively small area.

And an existing building deserves particular attention.

The fact that a space previously supported normal office use doesn’t mean it can support every new use being proposed.

The question should come early:

“Has anyone checked what this actually weighs—and whether the building can carry it where we’re putting it?”

Check Before You Buy

The expensive sequence is to select the equipment, commit to the purchase and then discover that the building requires structural work to accommodate it.

The better sequence is to identify unusual or concentrated loads while the project team can still evaluate alternatives.

That may mean asking the equipment or storage-system provider for actual loading information and having the landlord and structural engineer review the proposed installation.

The answer may be that the building can accommodate it as designed.

It may require reinforcement.

Or, as happened on this project, changing the equipment configuration may solve the problem more efficiently.

The important thing is to find out before the selection becomes a structural surprise.

Leadership takeaway: Before approving heavy equipment or dense storage, confirm the load and the building’s capacity. A selection that looks like furniture on the plan may actually be a structural decision.