Site Acceptance Checklist for Steel Sections

Accepting steel framing sections on site comes down to seven checks done in order: match the delivery note to the purchase order, count bundles and pieces, measure web width and length, measure sheet thickness with a micrometer at three points per piece, verify the galvanizing from the coil certificate rather than by eye, check straightness and transport damage, then store the accepted material correctly. Sample at least 10% of the bundles, record the lowest reading rather than the average, and photograph any non-conformance before the truck is unloaded. The checklist below is written for site engineers and contractors and covers studs, runners, omega channels and ceiling angles.

Before the truck arrives: paperwork and tools

Good acceptance starts a day before delivery. Ask for the delivery note in advance and compare it with the purchase order and approved material submittal. Pin down the following first:

• Section type and web width, for example STUDS at 4.8, 7.5 or 10 cm and RUNNERS at 5, 7.5 or 10 cm, the sizes Baghdadi Factory lists for these two sections.
• Nominal sheet thickness in millimetres, stating whether it means base metal or total thickness with zinc.
• Length. RUNNERS and STUDS from the factory are cut to order, so the order must carry a number.
• Galvanizing designation as it will appear on the coil certificate, such as Z140 or Z275 under EN 10346, or G60 and G90 under ASTM A653.
• Pieces per bundle and number of bundles.

The tools: a micrometer reading to 0.01 mm, a 5 m tape, a 2 m aluminium straightedge, a feeler gauge, a phone camera and a printed receiving form. Without a micrometer no load under 1 mm thick can be accepted with confidence; a difference of 0.1 mm is invisible to the eye.

Counting and dimensions: width, length, quantity

Open at least 10% of the bundles, never fewer than 3. From each pull 3 pieces from top, middle and bottom: outer pieces take strapping damage, inner ones hide rust and bow.

• Counting: count one full bundle, multiply, then spot-check 2 more bundles.
• Web width: measure at 3 positions, both ends and the middle. The project specification sets the limit; where it is silent, 1 mm is a common practical tolerance.
• Length: measure one piece per opened bundle. For cut-to-order sections about plus or minus 3 mm is commonly accepted, but the purchase order figure is binding.
• Stud-to-runner fit: a stud should enter a runner from the same load under hand pressure and hold with light friction. Loose or hammer-tight means a width error.

Thickness: the measurement behind most disputes

Thickness causes more arguments than any other check, usually through confusion between nominal, base metal and total coated thickness.

• A micrometer reads total thickness, base steel plus zinc on both faces. A Z275 coating adds roughly 0.02 mm per face, about 0.04 mm in total; Z140 adds about half.
• Measure at 3 points or more on the flat web, at least 10 mm from any edge or bend, where forming thins the metal.
• Record the lowest reading, not the average. ASTM C645 for non-structural framing and EN 14195 for gypsum board framing both define a minimum base metal thickness, not a mean.
• Manufacturing tolerance for galvanized sheet between 0.35 and 1.0 mm is roughly plus or minus 0.05 to 0.08 mm under the usual EN 10143 classes. A reading of 0.42 on a nominal 0.45 mm section is not automatically a rejection; a reading of 0.35 is.
• Tie the gauge to its purpose. Baghdadi Factory produces RUNNERS and STUDS in sheet thickness from 0.35 to 1.0 mm, thicker on request. The delivered gauge must be the one the designer used for the partition height.

Galvanizing and paint: what you can and cannot see

Zinc coating weight cannot be judged by eye, and no simple site test returns grams per square metre. The site can verify paperwork and inspect the surface.

• Paperwork: the coil certificate showing coating designation and steel grade. Z100, Z140 and Z275 under EN 10346 mean 100, 140 and 275 g/m2 total on both faces, roughly G30, G40 and G90 under ASTM A653.
• Surface: uniform grey or regular zinc spangle. Reject bare patches, flaking at the bends and any red rust.
• White rust: chalky deposits from moisture trapped between packed pieces. A light film brushes off harmlessly. Coverage above about 10% of the surface indicates poor storage before delivery and should be recorded.
• Painted sections: Baghdadi Factory supplies the W angle painted white and galvanized, both for hidden lighting installations. On the painted version check colour uniformity and scratches to bare metal, since this angle stays partly visible.

Straightness, distortion and transport damage

Lay the piece against the 2 m straightedge and check:

• Bow: the gap between piece and straightedge. A common practical limit is 1 mm per metre, so 3 mm on a 3 m stud. The project specification governs.
• Twist: stand the piece on its flanges and see whether all four edges sit flat.
• Crushed ends: strapping crushes the last 3 to 5 cm of outer pieces, and a crushed runner end will not take a stud.
• Flange angle: flange to web should be 90 degrees. A visible deviation weakens the screw fixing.
• Ceiling angle, L shape and shadow angle: legs equal where they should be, cut edge free of burrs that score the gypsum board.
• Omega and C Channel: the clip opening must have a consistent width, otherwise clips sit loose and the ceiling rattles.

Accept, reject, and store

Sign for what conforms, and keep the rest away from it:

• Full acceptance: all samples within limits. Sign and record the sampling percentage.
• Conditional acceptance: a minor deviation that does not prevent use, such as paint scratches or limited white rust. Note it with date and photographs.
• Partial rejection: isolate the bundles, tag them with red tape, keep them out of work zones. Notify the supplier in writing within 24 hours; many contracts extinguish the right to object after 48 to 72 hours.
• In every case: photograph the truck plate, bundle labels, micrometer display and any damage before the rest of the load comes off.

Storage is part of acceptance, because a sound load spoils in a week on the ground. Raise bundles at least 100 mm on timber bearers about 1.5 m apart. Cover against rain and dust but leave the sides open, since a sealed plastic sheet manufactures white rust on its own. Keep the steel away from wet trades and do not stack so high that the bottom bundle deforms. The Saudi Building Code requires materials to comply with the approved project specifications; the receiving record is your evidence to the consultant.

A practical close: the checklist in 12 lines

Copy these lines into your receiving form, with the measured figure against each:

• Delivery note matches purchase order: section, width, thickness, length, quantity, galvanizing.
• Coil certificate attached and matching.
• Bundle and piece count correct, at least 10% of bundles sampled.
• Web width at 3 positions within tolerance.
• Length within the agreed tolerance.
• Micrometer thickness at 3 points, lowest reading recorded and acceptable.
• No bare patches or red rust; white rust limited and documented.
• Bow within limit, no twist, flanges at 90 degrees.
• Ends not crushed; STUD enters RUNNER by hand.
• Non-conforming material isolated, tagged, photographed; supplier notified in writing.
• Storage raised, covered and ventilated.
• Receiver name, signature, date and time.

When ordering, fix length and thickness in the purchase order as numbers in millimetres, because Baghdadi Factory cuts lengths to order and asks to be contacted to specify them. What the order states is what gets measured at the gate.