Halls and steel structures
What to inspect on a steel building roof after the season
A steel hall roof inspection should not start only after goods have been flooded. A clogged gutter, a loosened flashing or a trace at a new service penetration can signal the need for action earlier. It is worth observing the roof after periods of increased weather loading and in line with the maintenance plan. The visual inspection must be distinguished from the legally required technical inspections. Before work begins, roof drawings, envelope data and the manufacturer’s recommendations should be gathered. Information on previous repairs and leak locations is useful. A steel hall may have different solutions in successive sections, especially after an extension. It must not be assumed that the entire roof requires identical treatment.
Start with documents and notifications
Employees can point out water stains, new noises or a drainage problem. Such observations do not replace a technical assessment, but they help to determine the scope of the check. Steel structures and the envelope should be inspected in conjunction with the history of events. A quick view of the roof surface from the yard alone will not show the condition of all fixings.
Access must be safe
Work on the roof requires preparation appropriate to the height, the substrate and the weather conditions. Not every section of the covering is intended for walking on. Skylights and areas of unknown load-bearing capacity require particular care. A steel hall should have a planned service access route, not a random route chosen by the contractor.
Equipment and materials used during the inspection also load the roof. Their distribution must be adapted to the documentation and the organisation of the works. Heavy packs must not be set down in just any location. A steel structure may have different conditions under a concentrated load than under an evenly distributed covering.
Check the water drainage path
Gutters, outlets and downpipes should remain clear. Leaves and residues from works can restrict drainage. In a steel hall, the areas at the eaves and flashings must also be assessed. Improperly drained water can reach the façade or the interior even though the panel surface itself is not punctured.
Cleaning should not damage the coatings and seals. The method must be matched to the materials used. The point where water is discharged on the site is also important. Steel structures do not solve the problem when a downpipe directs water permanently onto the base of a column or under a section of the envelope that requires a dry environment.
Inspect connections and penetrations
The ridge, side flashings, panel joints and fixings are among the points requiring attention. The condition of the seals and the surfaces around the fasteners is important. In a steel hall, the execution should be compared with the documentation, especially for elements added after completion of construction. New equipment on the roof means new locations of potential problems.
A service penetration should remain sealed and take account of the movement of the barrier. Cracked sealing material is sometimes a symptom of an unsuitable detail or of displacement. The repair should not be limited to covering the trace without establishing the cause. The steel structure and the envelope interact, so the assessment must sometimes also cover the supports beneath the covering.
Also check from the inside
In a steel hall, it is worth inspecting the accessible purlins, connections and areas beneath any reported leak. Traces of moisture may indicate the path of the water, but not always the exact point of leakage. Deformations or damage require an assessment appropriate to their extent. No element may be straightened nor any strut removed as part of a temporary roof repair.
Modular steel structures have a defined arrangement of components and fixings. Preserved marking of elements assists during inspection. If the building has been extended, the junctions between phases must be taken into account. Differences in height and new equipment may alter snow load conditions and the manner of water drainage.
Turn the inspection result into a work plan
The record should indicate the locations of defects, their significance and the recommended further action. Cleaning must be distinguished from repairs requiring technical documentation. A steel hall also requires statutory inspections within the appropriate scope and deadlines. The manufacturer’s maintenance recommendation does not replace these obligations.
Include new roof installations in the documentation after completion of the works. Inspect steel structures after events that may have caused damage. Adapt the timing of maintenance activities to the conditions of the facility and material recommendations. Agree roof works with the users of the zones located below. Do not access the roof without safeguards. Check drainage after cleaning. Retain photographs of defects.
In a steel hall, also document the locations that require re-observation. After repair, confirm that the flashings have been executed and material residues removed. Do not leave tools or filings on the covering surface. The scope of statutory inspection is determined for the specific facility, not according to the colloquial description of the hall. The most important outcome is the action performed, not merely the list of observed traces.
Compare the condition after winter with the previous documentation.
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