Concrete Repair in NHS Hospitals: Infection Control and Operational Continuity

The NHS Estate: Why Concrete Repair Presents Unique Challenges

The NHS estate comprises approximately 6,300 sites across England alone, including acute hospitals, mental health trusts, community facilities and specialist centres, many of which occupy buildings constructed between the 1960s and 1980s using concrete construction systems now showing significant signs of deterioration. Carbonation-induced spalling, chloride attack, freeze-thaw damage and long-term water ingress through flat roofs, plant rooms and basement structures are all common findings on NHS condition surveys, and the backlog maintenance liability associated with concrete deterioration represents a significant portion of the NHS's £11.6 billion estimated backlog (NHS Estates, 2023).

What distinguishes concrete repair in NHS and healthcare settings from commercial or industrial repairs is not primarily the technical specification of the materials — the same BS EN 1504 repair mortar systems and waterproofing membranes used in commercial buildings are appropriate for hospital environments — but rather the operational and infection control constraints that govern when, where and how the works can be carried out. A repair programme that would take two weeks in an empty commercial building may take six to eight weeks in a hospital environment when work windows are restricted to off-peak hours, dust containment requirements are intensive, and access routes must be managed to avoid clinical areas.

MPS Concrete Solutions works with NHS trusts, hospital facilities management teams and framework contractors to deliver concrete repair programmes that maintain compliance with infection prevention and control (IPC) requirements throughout the works period. Our experience on healthcare sites informs this guide, which is intended to help NHS estates managers and project teams understand the specific considerations that should be built into any healthcare concrete repair specification and programme. For a broader overview of concrete repair methods, our Concrete Spalling Repair Guide and our guide to diagnosing concrete defects provide useful technical background.

Infection Prevention and Control: The Primary Constraint

Healthcare-associated infections (HCAIs) — including Clostridioides difficile, MRSA and Aspergillus fumigatus — represent a serious clinical risk in hospital environments, and construction and maintenance activities that generate dust, vibration or air movement within or adjacent to clinical areas carry an elevated risk of dispersing fungal spores and other pathogens that can cause infection in immunocompromised patients. NHS Infection Prevention and Control guidelines (HTM 01-06 and the NHS Estates Infection Control in the Built Environment guidance) classify construction activities by risk level and require a formal Infection Control Risk Assessment (ICRA) to be conducted before works begin.

Concrete repair activities — particularly those involving percussive breaking-out of deteriorated concrete, grinding, shot-blasting or high-pressure water jetting — generate significant airborne dust and are classified as high-risk activities under most hospital ICRA frameworks. The control measures required for high-risk activities include the establishment of a defined construction control zone with clearly delineated boundaries; negative pressure containment using temporary hoarding, sealed penetrations and HEPA-filtered air extraction that maintains a negative pressure differential relative to adjacent clinical areas; mandatory PPE including P3 respiratory protection for operatives; decontamination facilities at the zone boundary; and daily inspection and maintenance of containment measures for the duration of the works.

The implications of these requirements for programme and cost should not be underestimated. Establishing a high-level containment zone — including hoarding, HEPA extraction, negative pressure monitoring, sealed floor and ceiling penetrations — adds 2–5 days of preliminary work before any concrete repair can begin, and dismantling the zone after works are complete requires a terminal clean and an independent infection control inspection before the area can be returned to clinical use. On a phased repair programme covering multiple locations within a hospital, the mobilisation and demobilisation of containment at each location can represent 30–50% of the total programme duration.

Working Hours, Noise and Vibration Constraints

NHS hospitals are operational 24 hours a day, seven days a week, and construction noise and vibration can affect patient recovery, surgical procedures, diagnostic imaging and the operation of sensitive medical equipment. Percussion breakers used to break out deteriorated concrete generate impact noise levels typically in the range of 95–105 dB(A) at source, and structure-borne vibration from percussive work on concrete floors can be detected at significant distances from the work area. Most NHS trusts restrict percussive concrete repair work to defined working windows — typically 07:00–18:00 on weekdays, with weekend working requiring advance approval — and may further restrict work adjacent to operating theatres, ITU or imaging suites during normal clinical hours.

Contractors planning healthcare concrete repair programmes should obtain the hospital's estates and facilities manager's approved working hours policy before tendering and should programme the works to concentrate percussive activities within the permitted windows. Where the permitted window is insufficient to complete the works within the available access period, night-shift working — with enhanced containment to reduce noise breakout — may be required. Night-shift premium rates for healthcare sites are typically 50–100% above standard day rates, and this cost must be included in the tender rather than treated as a variation.

High-pressure water jetting (hydrodemolition) is increasingly used as an alternative to percussive breaking for concrete removal on healthcare sites because it produces lower structure-borne vibration than mechanical percussion while still achieving effective removal of deteriorated concrete to a clean substrate. Water jetting generates a fine mist rather than dry concrete dust, which reduces the airborne particulate risk in ICRA terms, though the water management — preventing contaminated washwater from reaching occupied areas — adds additional containment requirements. Hydrodemolition equipment is noisier than some other approaches at the immediate work location but its noise spectrum is better managed by standard acoustic hoarding than that of percussive equipment.

Material Selection for Healthcare Concrete Repair

The material specification for concrete repair in NHS buildings should comply with BS EN 1504 as it would for any commercial application, but with additional consideration of two factors specific to the healthcare environment: the odour and VOC profile of the repair materials, and the chemical resistance of any surface coating or waterproofing layer applied over the repair.

Many polymer-modified repair mortars and liquid-applied waterproofing membranes contain volatile organic compounds (VOCs) that produce odours during application and curing. In occupied hospital buildings, odours from construction materials can cause complaints from patients and staff, can trigger respiratory responses in vulnerable patients, and in some cases can activate HVAC systems' chemical sensing alarms. Low-VOC or VOC-free material grades should be specified for all repair materials used in or adjacent to occupied clinical areas, and the product technical data sheet should be reviewed by the estates manager and the IPC team before materials are approved. Cementitious repair mortars are inherently low-VOC; some liquid-applied epoxy and polyurethane systems are available in low-odour or water-based formulations that significantly reduce VOC emission during application.

Floor and wall surfaces in clinical areas are subject to frequent cleaning with hospital-grade disinfectants — quaternary ammonium compounds, chlorine-based agents, and increasingly, hydrogen peroxide vapour systems for terminal disinfection. Any repair mortar or coating applied to surfaces in clinical areas must be resistant to these chemicals at the concentrations and contact times used in the hospital's cleaning and disinfection protocols. Cementitious surfaces are generally resistant to standard disinfectants but should be sealed with a chemical-resistant coating if hydrogen peroxide decontamination is used. Epoxy coatings offer the best chemical resistance profile for floor areas subject to frequent chemical exposure, but must be specified with appropriate slip resistance for wet clinical environments.

Procurement Routes and NHS Framework Contracts

NHS concrete repair works are typically procured through one of several routes: direct call-off under an NHS framework agreement (such as NHS Shared Business Services, Crown Commercial Service or a regional procurement framework); through a principal contractor who holds an NHS framework agreement and subcontracts specialist concrete repair work; or through a competitive tender process managed by the NHS trust's estates department. MPS Concrete Solutions operates as a specialist subcontractor to principal contractors on NHS schemes and works directly with NHS trust estates teams where direct appointment is permitted under the trust's standing financial instructions.

Successful delivery of concrete repair on NHS sites requires the contractor to hold current Construction Design and Management (CDM) 2015 compliant processes, NHS Contractor Induction certification for all site personnel, current DBS (Disclosure and Barring Service) clearance for operatives who may encounter patients or work in patient-facing areas, and liability insurance at the level required by the NHS trust. Method statements and risk assessments must be submitted for review and approval by the trust's estates and IPC teams before works commence, and a named clinical liaison contact should be established at the outset of the project to manage the interface between the construction works and clinical operations.

If you are an NHS estates manager or a principal contractor delivering works on NHS sites and require specialist concrete repair services, MPS Concrete Solutions can provide condition surveys, specifications and delivery with full NHS-compliant health, safety and infection control processes. Contact our team to discuss your requirements, and review our related guides including our guide to what to expect during a commercial concrete repair project for further information on the project management and delivery approach we apply to complex occupied-building schemes.