A construction vibration risk assessment is a project document, not a form. It explains how proposed work has been examined, what can create vibration, who or what may receive it, which controls have been selected and how those decisions will remain valid as the work changes. One document cannot answer every vibration question through a single rating.
A construction vibration risk assessment is a project document that explains how proposed work has been examined, what can create vibration, who or what may receive it, which controls have been selected and how those decisions will remain valid as the work changes. It is not a generic checklist attached to a method statement. Its purpose is to connect the actual programme, plant, ground conditions, working practices and neighbouring occupancy to decisions that can be implemented and checked.
One document cannot answer every vibration question through a single rating. The assessment must separate occupational hand-arm exposure from occupational whole-body exposure and from ground-borne vibration reaching third parties, buildings or sensitive equipment. Each has different sources, receptors, descriptors, evidence and controls. Combining them under a heading such as "vibration: medium risk" conceals those differences and does not support a defensible decision.
The distinction is introduced on the project orientation page; the present page concerns the assessment method itself.
The assessment must exist before mobilisation and before trial piling, enabling work or any other supposedly preliminary activity capable of generating vibration. Such work is part of the risk, not an opportunity to postpone thinking about it. An assessment written after plant has arrived cannot show that plant selection, tender assumptions, boundary arrangements or early communication were informed by assessed risk. It records a retrospective narrative rather than demonstrating prevention.
The document needs a named owner with access to the programme, temporary-works information, plant proposals, construction methods and current receptor information. That owner coordinates the assessment but need not personally perform every technical limb. Occupational exposure assessment requires competence in the relevant worker-exposure route and working practices. Evaluation of ground-borne effects requires competence in construction vibration, propagation, building response, instrumentation where proposed and the particular sensitive equipment involved. Specialist input may therefore be needed without transferring the project manager's responsibility for implementing decisions.
In the Emirate of Abu Dhabi, the occupational limb follows the mandatory framework in the Abu Dhabi Public Health Centre Code of Practice 3.1 Vibration. It is carried out under ADOSH-SF Element 2 Risk Management. The Code is mandatory for employers in the Emirate of Abu Dhabi; it is not federal law and must not be presented as a United Arab Emirates-wide ground-vibration regime.
The source inventory should be built activity by activity from the live programme. "Groundworks", "demolition" or "power tools" is too broad. The assessment should name the operation, proposed method, plant or tool, attachment, carrier, anticipated substrate or ground, work location, operating pattern and likely changes. Pile installation, trimming, slab cutting, breaking, crushing, compaction, loading, haul-road travel and temporary works may create materially different vibration even when undertaken by the same subcontractor.
The inventory should also identify interfaces. A breaker may create hand-arm exposure for its operator, whole-body exposure for a seated plant operator and ground-borne vibration at a boundary. A source must therefore appear in every relevant limb rather than being assigned to only one category. Detailed source characteristics for piling and demolition sit on the piling and ground-improvement page and the concrete breaking and demolition page.
Tender descriptions must be checked against the intended execution method. The most common defect is an assessment describing the tender method while the site executes a different one. A substituted attachment, larger carrier, revised pile system or change from cutting to impact breaking can invalidate the source assumptions even if the activity name in the programme remains unchanged.
A receptor inventory cannot be completed reliably from drawings alone. It should be built by walking the boundary, inspecting connections and checking actual occupancy. Drawings may omit a recently occupied unit, a basement extending towards the site, a temporary classroom, a tenant's precision equipment or a structure physically connected through a party wall, podium, slab, service bridge or buried element.
The inventory should distinguish site workers holding tools, operators supported by mobile plant, neighbouring occupants, buildings, fragile finishes, heritage fabric and vibration-sensitive processes or equipment. Occupancy matters because an apparently ordinary commercial unit may contain a laboratory, imaging system, precision balance, server installation or manufacturing process with criteria much more restrictive than building-damage considerations. The treatment of such receptors is addressed on the sensitive receptors and equipment page.
The check should establish when receptors are occupied, what activities occur, who can verify changes and whether access is available for inspection or monitoring. A vacant receptor at tender stage may become occupied before the vibration-producing phase begins. The receptor register therefore needs an update route rather than being treated as a static appendix.
The source and receptor lists become an assessment only when the path between them is examined. Relevant features include soil and rock conditions, foundations, buried structures, retaining systems, party structures, slabs, temporary works and physical discontinuities. Distance is relevant, but it is not a complete proxy for transmission.
A rigid connection at the boundary can matter more than a greater separation through less efficient ground. A shared basement, continuous slab or structural connection may provide an effective path that a plan-view distance misses. Conversely, a discontinuity may alter transmission. The assessment should identify uncertainty rather than convert an unverified ground model into certainty. How vibration travels, attenuates and is perceived is covered separately on the ground-borne vibration page.
The Code of Practice route starts with observation of specific working practices and reference to information on the probable magnitude of vibration corresponding to the equipment used in the particular working conditions. Measurement is used only where necessary. Measurement is therefore a fallback for unresolved uncertainty, not the automatic starting point and not a substitute for observing how the task is actually performed.
Relevant information may include dependable manufacturer data, data from comparable use, tool condition, inserted tool or consumable, material, grip, feed force, operating pattern, seat condition, travel surface and exposure duration. Catalogue information should not be adopted without checking whether it represents the site configuration and real use. The separate occupational pages address hand-arm vibration and whole-body vibration in detail.
The assessment must consider intermittent vibration and repeated shocks, workers at particular risk, information supplied by the manufacturer, and the availability of replacement equipment designed to reduce exposure. It must also consider exposure occurring beyond normal working hours and low temperatures. Those matters require enquiry into the real shift, maintenance state and work organisation rather than a calculation based on nominal task time.
Where applicable, the hand-arm daily exposure action value is 2.5 m/s² A(8), and the daily exposure limit value is 5 m/s² A(8). A(8) is a daily personal exposure to vibration normalised to an eight-hour reference duration, root-mean-square and frequency-weighted. The whole-body daily exposure action value is 0.5 m/s² A(8), and the daily exposure limit value is 1.15 m/s² A(8). A(8) is a daily personal exposure to vibration normalised to an eight-hour reference duration, root-mean-square and frequency-weighted. These are worker-exposure values from the Code and must never be used as building-damage, neighbour-disturbance or alarm criteria.
No published United Arab Emirates instrument was located that sets a ground-borne vibration damage threshold for neighbouring buildings, none was located that imposes a general duty to monitor vibration on adjacent structures, and no UAE authority publishes a vibration trigger or alarm value. The assessment must not soften that finding or fill the gap with a worker-exposure limit.
If a third-party criterion is adopted, the document should record its exact provenance, who selected it, the receptor and effect it is intended to protect, and the technical and contractual basis for selection. Recognised practice including DIN 4150-3, BS 7385-2, BS 5228-2 and ISO 2631-2 may be adopted contractually or specified project by project, but none is a UAE requirement. Their tables should be consulted in the controlled source document, not copied selectively into a generic assessment. PPV criteria carry a frequency dependence.
The need for a project criterion, monitoring or surveys should arise from the assessed source–path–receptor relationship, contractual requirements and stakeholder arrangements. The assessment should link to the project's trigger and alarm strategy without pretending that the selected values were issued by a UAE authority.
A suitable and sufficient assessment describes the work as it will be executed, identifies foreseeable variation, distinguishes each exposure and impact route, states evidence and uncertainty, assigns controls to named roles, and defines how effectiveness will be checked. A paper exercise repeats generic hazards, names no receptor, cites no data source and does not influence procurement, sequencing, method or supervision.
Review is required when the method, plant, attachment, carrier, work location, ground assumption, programme, working pattern or receptor changes; when monitoring or a trial contradicts an assumption; after a complaint or unusual event; and when a control proves unavailable or ineffective. Review means reconsidering the decision, not merely changing the date on the cover.
The assessment should remain connected to the executed method statement, activity log, briefing and change-control process. Its value is demonstrated by decisions made before work and by prompt revision when reality departs from the assumptions.
In the Emirate of Abu Dhabi the occupational limb follows ADPHC Code of Practice 3.1 Vibration, Version 4.0, 15 July 2024, carried out under ADOSH-SF Element 2 Risk Management. It is mandatory for employers in the Emirate of Abu Dhabi and is not federal law. Section 3.2 sets the hand-arm daily exposure action value at 2.5 m/s² A(8) and limit value at 5 m/s² A(8), and the whole-body daily exposure action value at 0.5 m/s² A(8) and limit value at 1.15 m/s² A(8), where A(8) is a daily personal exposure to vibration normalised to an eight-hour reference duration, root-mean-square and frequency-weighted. No published UAE instrument supplies a ground-borne criterion for the third-party limb.
ADPHC Code of Practice 3.1 — Vibration, Version 4.0, 15 July 2024, section 3.2
No. Hand-arm exposure, whole-body exposure and ground-borne effects have different receptors, evidence and criteria. A combined score hides the route that needs control and can lead to occupational values being misapplied to buildings or third parties.
No. Under the occupational route, observation of actual working practices and reliable information for equipment in comparable conditions come first, with measurement where necessary. The third-party decision depends on the assessed source, path, receptor, contract and uncertainty because no general UAE monitoring duty was located.
A competent coordinator can own the document, but each technical limb must be assessed by a person with the relevant knowledge, training and experience. Complex propagation, fragile structures or sensitive equipment may require specialist construction-vibration input alongside occupational-hygiene competence.
A material difference between the assessed and executed method can invalidate it. Changes to plant, attachments, ground treatment, location, working pattern, receptor occupancy or structural connection require review even when the programme retains the same activity description.
No. Recognised practice can become a contractual or project-specific requirement when properly adopted, but it does not become a UAE statutory criterion. The assessment must state the source, selector, protected receptor and basis for every third-party criterion.