A steel beam can arrive exactly as ordered and still be wrong for the job if the order used an outdated drawing or omitted a connection detail. Before work starts, check that the designer, fabricator and contractor are working from the same information.
The situations below are planning examples, not reports of RSJ.info site inspections. They identify questions to resolve with the responsible people. They do not prescribe an installation sequence for an unseen building.
1. Ordering from an incomplete or old detail
A description such as “one 203 beam, about four metres” omits the full section, grade, cutting length and fabrication requirements. A later drawing revision can also change holes, plates or the support detail while leaving the headline beam name unchanged.
Check the drawing reference and revision on the quotation, order and contractor’s copy. Record who authorises fabrication and how a superseded drawing is withdrawn. Resolve discrepancies before steel is cut or drilled.
2. Accepting a stock substitution without design review
A supplier’s proposed alternative may solve an availability problem while creating a different geometric or structural arrangement. Extra depth can affect a ceiling; different flange geometry can affect a connection.
Send the full alternative designation and product information to the designer. Keep the approval or revised instruction with the order. “Heavier” and “stronger-looking” are not a documented substitution check.
3. Treating the support as an afterthought
A beam calculation does not by itself establish that an existing wall, bearing or structure below can receive the reaction. Photographs may not reveal concealed construction or its condition.
Ask what support information needs to be confirmed and who resolves an unexpected finding. A different wall construction or an obstruction at a bearing is a reason to refer back to the design, not to improvise a larger block. Our bearing-pressure explanation shows why dividing force by area is only arithmetic, not a complete padstone design.
4. Assuming the permanent design covers temporary support
Identify responsibility for the temporary condition before structural work begins. HSE’s structural-stability guidance and temporary-works guidance explain why alteration work needs appropriate planning and management.
Confirm how the contractor obtains the temporary-works information and what changes must be referred back. This article deliberately gives no universal prop layout or removal sequence. Those depend on the building and the agreed method.
5. Checking delivery access after fabrication
An item’s length, connections and complete weight matter along the whole route from delivery vehicle to final position. An opening that accommodates the bare section may not accommodate welded plates or the required handling arrangement.
Discuss access with the fabricator and contractor before ordering. Confirm who unloads and what the delivery price includes. If the proposal changes to several pieces, obtain a designed connection detail rather than treating the change as transport logistics alone.
6. Covering work before agreed checks
Clarify notifications and inspections with the relevant building control body and the people carrying out the work. Establish which details and records must be available before finishes conceal them.
Fire protection and corrosion protection also need their specified system and details. Product names alone do not describe preparation, joints, fixings or compatibility. Retain the relevant instructions and completion records in the project file.
Use a short pre-start record
| Item | Evidence to have available |
|---|---|
| Permanent arrangement | Current issued drawings and calculations |
| Steel order | Matching section, grade, lengths and fabrication revision |
| Supports | Confirmed conditions or a plan to resolve outstanding information |
| Temporary condition | Named responsibility and agreed information route |
| Delivery | Fabricated item details, access and unloading arrangements |
| Inspections and finish | Agreed checks, protection specification and handover records |
Where information is missing, record an owner and an action rather than ticking the item as complete. If site conditions differ from the design, obtain the responsible person’s revised instruction before changing the structural arrangement.
Structural work must be designed by a chartered structural engineer and receive the applicable Building Control approval. This educational checklist has not received an independent engineering review.