About | SigmaPhi Structural Solutions

Who we are

Engineering and execution, under one team.

SigmaPhi Structural Solutions is a Dubai-based specialist contractor delivering concrete restoration, structural strengthening, structural modification and building rehabilitation solutions across residential, commercial, industrial and infrastructure assets.

Established by professionals with extensive experience in reinforced-concrete and post-tensioned structures across the UAE and wider region, SigmaPhi combines structural engineering capability with practical specialist execution.

Our integrated approach brings assessment, engineering design and execution under one coordinated team, allowing strengthening and rehabilitation solutions to be developed around the actual condition of the structure, project requirements and site constraints.

Access scaffolding to a building facade under repair

Existing structures

Registration

Legal name	SigmaPhi for Concrete Restoration L.L.C S.O.C
Trade licence	1605274
Jurisdiction	Dubai Mainland — DET
Activity	Concrete Restoration & Building Maintenance

Management systems

ISO 9001:2015	Quality — in progress
ISO 45001:2018	Occupational health & safety — in progress
ISO 14001:2015	Environmental — in progress

SigmaPhi's project procedures — including method statements, inspection and test plans and risk assessments — are developed in alignment with these management-system principles while certification is being progressed.

Why we exist

The gap we were built to close.

The challenge

Structural strengthening and rehabilitation projects are often fragmented between investigation, engineering design, general contracting and specialist execution.

When actual site conditions differ from available drawings or assumptions, decisions can pass between several parties before the solution is revised and implemented — affecting programme, coordination and accountability.

On post-tensioned structures the consequences can be greater. Coring, cutting or anchoring without accurately identifying existing tendons and reinforcement can compromise the structure and turn a routine modification into a significant structural issue.

Our answer

SigmaPhi integrates the required stages within one coordinated technical process:

Survey, testing and diagnosis to establish actual conditions
Structural analysis, calculations and detailed strengthening design
Specialist strengthening and modification works
Concrete repair, protection and waterproofing
Verification, records and technical close-out

Omar Al Naber, Founder & Managing Director of SigmaPhi Structural Solutions

Founder's message

SigmaPhi was founded on a simple principle: structural repair and strengthening are engineering challenges first. After more than 15 years working with reinforced-concrete and post-tensioned structures across the UAE and wider region, I saw the value of bringing engineering and execution closer together. SigmaPhi brings both under one technically accountable team — assessing, designing and executing solutions with minimum disruption to the client's operation.

Omar Al Naber

Founder & Managing Director

Design codes & standards

Every service, tied to a published standard.

SigmaPhi designs and executes structural strengthening, repair and rehabilitation works with reference to recognised international codes, standards and local authority requirements. These form the technical basis for our calculations, specifications, method statements and inspection plans, as applicable to each project.

Standard	Title	Where we apply it
ACI 318-19	Building Code Requirements for Structural Concrete	RC design, jacketing, anchorage
ACI 562-21	Assessment, Repair and Rehabilitation of Existing Concrete Structures	Governing repair code
ACI 440.2R-17	Externally Bonded FRP Systems for Strengthening Concrete Structures	CFRP design
ACI 549.4R-20	Design and Construction of Externally Bonded FRCM Systems	FRCM strengthening
ACI 224.1R	Causes, Evaluation and Repair of Cracks in Concrete Structures	Crack classification
ACI 437.2R	Load Testing of Concrete Structures	In-situ verification
BS EN 1504-1:10	Products and Systems for the Protection and Repair of Concrete Structures	Repair products and strategy
BS EN 1992-1-1	Eurocode 2 — Design of Concrete Structures	Structural design
BS EN 1993-1-1	Eurocode 3 — Design of Steel Structures	Steel strengthening
TR55	Design Guidance for Strengthening Concrete Structures Using Fibre Composites	FRP design (UK practice)
BS 8102:2022	Protection of Below Ground Structures Against Water Ingress	Basement waterproofing
PTI DC-20.7	Specification for Grouting of Post-Tensioned Structures	PT grouting and duct integrity
ASTM C805 / C597	Rebound Number / Ultrasonic Pulse Velocity	NDT strength and integrity
ASTM C876	Half-Cell Potentials of Reinforcing Steel	Corrosion probability
ASTM D7522	Pull-Off Strength of FRP Bonded to Concrete	CFRP QA/QC
BS EN 14630	Determination of Carbonation Depth by Phenolphthalein	Carbonation front
AASHTO T260	Sampling and Testing for Chloride Ion in Concrete	Chloride profiling
Dubai Municipality	Building and Construction Regulations, Circulars & Green Building Regulations	Authority compliance

Where a project specification requires a different or later edition, the project-specific requirement governs.

Project team & resources

How a SigmaPhi project is staffed.

Project resources are mobilised according to the scale and technical requirements of each contract. Specialist equipment and additional resources may be deployed directly or through approved specialist suppliers and subcontractors under SigmaPhi's technical and quality control.

Role	Responsibility	Background required
Technical Director	Strengthening scheme, analysis, design sign-off, consultant and authority interface	Structural engineer — RC and post-tensioned design
Operations Manager	Contract delivery, programme, commercial control, client reporting	Specialist repair contracting, UAE market
Design Checker	Verification of strengthening calculations prior to issue for construction	Structural engineer
Site Engineer	Method statement implementation, ITP hold points, quality records, daily reporting	Civil / structural engineer with repair site experience
Site Supervisor	Crew supervision, workmanship, permit compliance, materials control	Trade-qualified with CFRP and repair mortar experience
HSE Officer	Risk assessment, permits, toolbox talks, incident reporting	Appointed per project scale and client requirement

The table describes the typical project organisation. Roles are appointed per contract, and detailed CVs for the appointed project team are issued with tender submissions and prequalification responses.

Working with us

Where we're the right contractor.

We would rather tell you early that a job isn't ours than take it and learn that on site.

Existing structures need work

Strengthening, repair or rehabilitation of a structure already built and often still in use.

Openings or modifications

New slab openings, wall or column removal, load transfer and permanent framing.

Loading exceeds capacity

Change of use, plant installation or added storeys beyond what the structure was designed for.

Engineering and execution need to be joined

Where the design has to respond to what is actually found on site, not the other way round.

A specialist contractor with engineering in-house