How to Read a Racking Drawing Before Signing It Off
Direct answer: A racking elevation is read bottom-up: base plate level, first beam level, then each beam level spacing, with the top level and total height annotated. Bay widths read left to right, and the load figures apply per beam pair at the stated span.
What the drawing is telling you
A plan view shows runs, aisles and their widths; an elevation shows each frame as a stack of levels. Bay width is the distance between upright centres along the run, and levels are counted from the floor, where the first beam level sits on the ground.
Look for the numbers that drive everything: clear height, beam level spacing, bay count per run, and the rated load per level and per bay.
Checks that catch real errors
Compare the drawing against your building: column positions, sprinkler clearances, dock positions and travel routes. Then compare beam spacings against your tallest pallet plus clearance. A drawing that looks tidy but ignores a sprinkler main or a structural column will come back as a costly revision on site.
Confirm the load signs quoted match the drawings — approvals bodies will expect them to agree.
FAQ
What is a bay on a racking drawing?
One module of the run, measured between two uprights. Pallet positions per level usually equal two per bay, one between each pair of beams.
Which number matters most?
Clear height to the underside of the lowest obstruction, because it caps how many usable levels you can have regardless of the drawing.
Who checks the drawing against the building?
Ideally the supplier's survey plus the customer's operations review. Column positions and sprinklers are the two items most often caught late.
All figures above refer to standard product data sheets; final confirmation is subject to written quotation.