Use the builder above to lay out your run and get the parts list. Below is the part most rack pages skip: how to work out whether you are adding to racking that is fit to carry the load, what an inspector looks for, and when a damaged upright has to come out rather than be patched.
Before you add to existing racking
Most of the racking we are asked to extend is already loaded. Adding bays to a run changes how the whole row behaves, so three things get checked before anything is ordered.
The upright has to be the same profile, not just the same size
A 3" x 1.625" teardrop upright and a 3" x 3" Keystone upright can both be 42" deep and 120" tall and will not connect to each other. Beam connectors are cut for one hole pattern. Measure the hole spacing on your existing frame before ordering: teardrop is 2" on centre, Keystone is 2" with a keyhole slot, and Republic is 1.5". If the pattern does not match, the new bays run as a separate row with their own pair of uprights.
Capacity is set by the weakest upright in the row
A run is only as strong as its most damaged frame. If one upright has a bowed post or a cracked weld, the whole row's working capacity drops to whatever that frame can carry. Extending a row with damage in it spreads the load across a component that is already compromised.
Floor condition decides the anchor count
Anchors transfer overturning force into the slab. On a sound 5" slab, two anchors per post is standard. On a thinner slab, a joint, or where a post sits within 6" of an edge, four per post is the safe assumption, and a slab under 4" needs an engineer to look at it before any racking is bolted down.
Rack damage: what comes out and what can stay
Damage is graded by how far the steel has moved out of true, measured over a set length. The thresholds below are what our crews work to.
| What you can see | Measured over | Action |
|---|---|---|
| Post bowed front to back | Under 1/2" in 40" | Monitor, record, re-inspect |
| Post bowed front to back | Over 1/2" in 40" | Unload the bay, replace the post |
| Post bowed side to side | Over 1/4" in 40" | Unload the bay, replace the post |
| Beam deflected under load | Over span divided by 180 | Reduce the load or replace the beam |
| Beam still deflected when empty | Any amount | Replace - the steel has yielded |
| Cracked weld at base plate | Any | Unload immediately, replace the frame |
| Torn or deformed beam connector | Any | Replace the beam |
| Anchor loose or missing | Any | Re-anchor before reloading |
A bowed post that is still within tolerance is not a repair job, it is a monitoring job. Record the measurement and the date, and measure the same point again at the next inspection. Movement between readings matters more than the reading itself.
How often racking should be inspected
There is no single federal interval for rack inspection in the US. OSHA cites the general duty clause, and the industry standard referenced in practice is ANSI MH16.1. What that works out to in a normal warehouse:
| Check | Interval | Who does it |
|---|---|---|
| Visual walk of aisles, damage reported | Weekly | Warehouse staff |
| Recorded inspection, measurements logged | Every 12 months | Competent person |
| Expert inspection with written report | Every 12 months, or after any impact | Rack specialist |
| Immediate re-inspection | After any forklift strike | Competent person |
| Load plaque check | Every 12 months | Competent person |
The trigger that catches people out is the impact one. A strike that leaves no visible mark can still have moved a post out of tolerance, and the bay stays loaded in the meantime.
Repair or replace
Repair kits exist for upright posts and they are legitimate when engineered and installed correctly. The decision is not about cost, it is about where the damage is.
| Damage location | Usual answer | Why |
|---|---|---|
| Post, lower 24", front or back face | Repair kit | Standard impact zone, kits are designed for it |
| Post, above the first beam level | Replace the frame | Out of reach of a bolt-on kit, and load path runs through it |
| Base plate or anchor point | Repair kit with new plate | Replaceable without pulling the whole frame |
| Diagonal or horizontal brace | Replace the frame | Bracing is welded, it sets the frame's stiffness |
| Beam, any damage | Replace the beam | Beams are not repaired, they are swapped |
Working out how much floor space a run needs
Row length is the bay count multiplied by the beam length, plus one upright depth for the starter frame. A run of six bays on 96" beams with 3" posts measures 6 x 96" plus 3", which is 49' 3".
Aisle width is set by the truck, not the racking. A counterbalance forklift handling a 48" pallet needs 12' to 13' of clear aisle. A reach truck needs 8' to 9'. A very narrow aisle truck works in 5' 6" to 6' 6" but needs wire guidance or rail in the floor. Measure from rack face to rack face, not from post to post, and add nothing for pallet overhang - the beam length already covers it.
Pallet positions count the floor as a level. A six bay run, two beam levels, two pallets per bay gives 36 positions: 12 on the slab and 24 on the beams. The builder above counts it this way.
Common questions
Can I mix new and used racking in the same row?
Only if the upright profile, hole pattern and post size match, and the used frames are within the damage tolerances above. Capacity for the row is set by the lowest-rated frame in it.
Do I need a permit to install pallet racking?
It depends on the jurisdiction and the height. Many authorities require a permit and stamped drawings above 8' to 12' of storage height, and seismic areas have their own requirements. Check locally before the steel arrives.
What happens if a load plaque is missing?
The racking has no documented capacity, which means nobody on the floor knows what it can carry. It has to be re-rated by a specialist and re-plaqued. This is one of the most common findings on a first inspection.
How long does an installation take?
Our installation crews will typically stand 40 to 60 bays a day on a clear floor with the steel on site. Teardown and relocation runs slower because the existing racking has to be emptied and inspected as it comes apart.
Can damaged racking be left loaded until the repair?
No. If a post is outside the tolerances in the table above, the bay comes off load before anything else happens. The cost of unloading a bay is not comparable to the cost of a collapse.