What is a Construction Method Statement?
A Method Statement (often abbreviated as MOS - Method of Statement, or WMS - Work Method Statement) is a formal document that details exactly how a specific construction activity will be carried out.
It acts as a step-by-step instruction manual for the site crew, ensuring that the work is performed:
- Safely: Identifying risks and control measures.
- Correctly: Following technical specifications and standards.
- Efficiently: organizing resources (manpower and equipment) properly.
Before any major activity (e.g., "Excavation", "Concrete Casting", "Steel Erection") begins, the contractor must submit an MOS to the consultant for approval.
Why is it Mandatory?
You might ask: "We know how to pour concrete, why do we need a 20-page document for it?" Here is why:
- Legal Protection: In case of an accident, the MOS proves that a safe system of work was planned. If the crew didn't follow it, it's a violation. If there was no MOS, it's negligence.
- Quality Assurance: It integrates with the ITP (Inspection and Test Plan). The consultant checks the work against the steps approved in the MOS.
- Resource Planning: It forces the site engineer to think ahead: "Do I have enough vibrators? Is the crane reach sufficient?"
- Approval Pre-requisite: Most contracts (especially FIDIC-based) prohibit starting major works without an approved Method Statement.
Key Components of a Method Statement
A professional MOS should contain the following sections:
1. Scope of Work
A brief description of what is being done and where (e.g., "Installation of Chillers in Building A, Roof Level").
2. Responsibilities
Who is in charge? Listing roles involves:
- Project Manager: Overall approval.
- Site Engineer: Direct supervision.
- Safety Officer: Monitoring H&S compliance.
- Foreman: Managing the labor force.
3. Resources (Manpower & Equipment)
What do you need to do the job?
- Personnel: 1 Surveyor, 2 Masons, 4 Helpers, 1 Operator.
- Plant/Equipment: Excavator (CAT 320), Dump Truck, Total Station.
- Materials: C25 Concrete, Epoxy coating type X.
4. The Methodology (The "Method")
This is the core of the document. It must be sequential and specific. For Concrete Pouring, it might look like this:
- Step 1: Preparation: Cleaning formwork, applying mold oil, checking rebar cover.
- Step 2: Inspection: Requesting RFI (Request for Inspection) from the consultant.
- Step 3: Pouring: Concrete arrival, slump test, pouring layers of 30cm.
- Step 4: Compaction: Using poker vibrators (max 10 sec per point).
- Step 5: Curing: Applying curing compound or wet hessian for 7 days.
RAMS: Risk Assessment Method Statement
In modern construction (especially in the UK and Gulf regions), the MOS is almost always combined with a Risk Assessment to form a RAMS document.
| Method Statement (MOS) | Risk Assessment (RA) |
|---|---|
| Focuses on "HOW" to do the work. | Focuses on "WHAT" could go wrong. |
| Written by Engineers. | Written by Safety Officers (with Engineers). |
| Ensures Quality & Efficiency. | Ensures Safety & Health. |
Golden Rule: The Risk Assessment must be communicated to the workforce via a TBT (Toolbox Talk) before work starts. Getting workers to sign the TBT attendance is crucial evidence of briefing.
Practical Tip: How to get your MOS Approved?
Consultants often reject MOS submissions for being "copy-pasted". To avoid this:
- ✅ Be Site-Specific: Don't say "We will use a crane." Say "We will use a 50-ton Mobile Crane positioned at Gridline A-5."
- ✅ Attach Datasheets: Include technical data for materials and equipment certificates.
- ✅ Reference Specs: Cite relevant clauses from the project specifications (e.g., "In accordance with Section 03300, Clause 3.1").
- ✅ Include Drawings: Attach a sketch showing access routes, pouring sequence, or lifting plans.