From Drawing Approval to Delivery: The Metalwork Process

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After the client approves the drawing and written specification, the fabrication shop cuts, welds and assembles the elements in the factory, then applies the agreed finish such as hot-dip galvanizing or powder coating. The finished pieces are checked, packed and delivered to site for installation, usually in a sequence agreed with the contractor.

Why the approved drawing is the starting point

Once a drawing is signed off, it becomes the reference for everything that follows. Any later change means revising the drawing and re-confirming the affected dimensions, profiles and finishes. For this reason, it helps to review the drawing carefully before approval, checking openings, anchor positions and interfaces with other trades.

A clear written specification should accompany the drawing. It lists materials, profile sizes, weld and grinding requirements, surface finish and colour references, so that production and the client are working from the same document.

Production in the factory

Production begins with material ordering and cutting to length, followed by forming, welding and assembly. Pieces are typically fabricated as sub-assemblies, which are then checked against the drawing before being joined into the final element. Working in the factory allows tighter control over dimensions than work carried out on site.

Cutting and profile preparation
Welding and assembly of sub-units
Dimensional check against the drawing

Surface treatment and finishing

Finishing is planned at the specification stage because it affects handling and lead time. Common options include hot-dip galvanizing for corrosion protection on exterior steel and powder coating for a wide range of colours and textures. Stainless steel and aluminum may be finished by brushing or polishing instead.

Pieces that will be galvanized need to be designed with venting and drainage in mind. Your fabricator should confirm these details during the drawing stage, not after production.

Quality check and packing

Before leaving the factory, finished pieces are inspected for dimensions, weld quality, surface condition and conformity to the approved drawing. Protective film or padding is applied where needed to prevent damage during transport. Pieces are often labelled or numbered to match the installation plan, which speeds up work on site.

Where the project includes a structural or safety element, such as a railing, the design should be reviewed against the Israeli railing standard SI 1142, with exact values confirmed by the project engineer.

Delivery and coordination on site

Delivery is best scheduled with the contractor so that elements arrive when the building is ready to receive them. Storing finished metalwork in a dry, covered area protects the finish until installation. Early coordination also avoids the common problem of pieces waiting on site while other trades are still active.

Installation and handover

Installation is carried out after the fixing points have been confirmed on site. Anchors, levels and alignment should be checked as work progresses, and any site adjustments recorded. Once installed, the elements are inspected against the approved drawing before handover to the client or contractor.

Frequently asked questions

How long does the approval stage usually take?

It depends on how many revisions the drawing needs and how quickly the client or architect responds. Clear measurements and a complete specification help keep this stage short.

Can changes be made after the drawing is approved?

Changes are possible but should be avoided where they affect production. Any revision requires an updated drawing and a new approval before work continues.

Who measures the openings on site?

On-site measurement is normally done by the fabricator before the drawing is prepared. Measurements taken before finishing works are complete are usually the most reliable.

Why does the finish need to be decided early?

The finish affects design details such as venting for galvanizing and the handling method. Deciding it at the specification stage prevents delays later.

Common mistakes to avoid

The most common problems come from approving drawings with unconfirmed dimensions or leaving the finish undecided until production. Both can cause rework and delay delivery.

Our recommendation

Send the architect's detail drawings, the finish requirements and the installation sequence together at the start, and ask the fabricator to confirm interfaces with other trades before approval.

Summary

The process runs from drawing approval through factory production, finishing, quality checks, delivery and site installation. Careful early decisions on dimensions and finish keep the schedule on track.

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