Why Is Glazing Maintenance Important?
Glazing is an integral part of a building’s external envelope, providing natural light, weather protection, thermal performance, ventilation and, in some cases, fire resistance or fall protection. Windows, glazed doors, curtain walling and rooflights all require appropriate inspection and maintenance to preserve their performance throughout the building’s operational life.
Although glazing may appear to require little maintenance, deterioration of seals, frames, fixings and operating hardware can lead to water ingress, draughts, reduced energy efficiency, operational failures and potentially serious safety hazards.
For facilities managers and maintenance personnel, understanding the type of glazing installed, its intended performance and the associated maintenance requirements is essential to maintaining a safe and functional building.
What Are the Different Types of Glazing?
Glazing systems vary significantly in their construction, function and maintenance requirements. The maintenance regime should reflect the materials installed, the location of the glazing and the conditions to which it is exposed.
- Windows: windows may incorporate single, double or triple glazing, aluminium, timber, steel or uPVC frames, opening hardware, seals and drainage systems.
- Glazed Doors and Entrance Systems: this can include fully framed doors, frameless glass doors, automatic sliding doors and glazed entrance screens.
- Curtain Walling and Shopfront Glazing: typically comprising large glazed panels supported by framing systems, with gaskets, sealants, pressure plates, fixings and drainage provisions.
- Rooflights and Skylights: rooflights introduce natural light into a building but require particular attention because of their exposure to weather, ultraviolet radiation, thermal movement and potential deterioration of glazing materials and fixings.
Relevant Maintenance Standards & Regulatory Requirements
Glazing inspection, cleaning, seal maintenance, and glass replacement should be conducted in accordance with applicable workplace safety laws, building maintenance codes, national access standards, and manufacturer care instructions. Specific requirements depend on building height, access methods, glazing location, and jurisdiction.
Australia and New Zealand
- AS 1288: Glass in Buildings , Selection and installation – applies specifically when selecting replacement glass during maintenance or repair activities to ensure safety compliance.
- NZS 4223.1: Glazing in buildings, Glass selection and glazing – Contains manufacturer care, cleaning, and maintenance guidelines to protect glass coatings, laminates, and sealants from chemical or mechanical damage.
- Work Health and Safety (WHS) Legislation & Safe Work Australia Guidance – Mandatory requirements for managing risks associated with working at height, fragile surfaces (e.g., rooflights), fall prevention, and safe execution of maintenance activities.
- CIRIA Guide C648: Guidance on the maintenance of building envelopes – Practical engineering guidance on the inspection, seal maintenance, and refurbishment of glass curtain walls and overhead glazing.
- BS 8213-1: Windows, doors and rooflights, Design for safety in use and during cleaning of windows – Key national standard governing safe access procedures, operational requirements, and cleaning methods for glazing.
- CSA Z91: Health and safety code for window cleaning operations – The primary Canadian standard governing safety equipment, inspection schedules, and procedures for window and glazing maintenance.
- Provincial & Territorial Occupational Health and Safety (OHS) Regulations (e.g., WorkSafeBC, Ontario O. Reg. 213/91) – Mandates fall protection, anchor point inspections, and safe execution of maintenance work around fragile glass and elevated glazing.
- ANSI/IWCA I-14.1: Window Cleaning Safety Standard – The standard for safe window and glazing maintenance, detailing anchor inspection, equipment safety, and exterior glass cleaning protocols.
- NGA (National Glass Association) Field Guidelines – Industry-standard instructions for field inspection, seal integrity evaluation, and cleaning techniques for high-performance coated and insulating glass units.
Glazing selection, installation, inspection and maintenance should be considered in conjunction with the applicable building regulations, recognised standards, manufacturer instructions and workplace health and safety requirements. Requirements vary between jurisdictions and may depend on the building type, glazing location and intended function.
What Maintenance Requirements Should Be Considered?
The appropriate maintenance regime will depend on the installed glazing system, manufacturer recommendations, environmental exposure, usage and project-specific requirements.
Typical maintenance activities include:
- Glass cleaning: Clean glass using approved products and methods that will not damage coatings, films, finishes or adjacent materials.
- Frame inspection: Check for corrosion, deterioration, distortion, loose fixings and physical damage.
- Seals and gaskets: Inspect for cracking, shrinkage, displacement or loss of adhesion.
- Drainage: Check that frame drainage channels and weep holes are clear.
- Operating hardware: Inspect hinges, locks, handles, closers, pivots, restrictors and sliding mechanisms for wear and correct operation.
- Sealant joints: Inspect perimeter and movement joints for deterioration, separation or loss of adhesion.
- Water ingress: Investigate staining, dampness and leakage around windows, doors and glazed façades.
- Rooflight condition: Check glazing materials, fixings, seals and surrounding roof interfaces, using safe access arrangements.
- Safety systems: Where applicable, inspect door sensors, safety devices, restrictors and associated controls in accordance with the relevant manufacturer’s instructions.
Maintenance frequencies should be established from the manufacturer’s recommendations, warranty conditions, project documentation and the building’s exposure and operating conditions. More frequent inspections may be appropriate for coastal locations, exposed façades, high-use entrances and buildings subject to severe weather or pollution.
Suggested glazing maintenance schedule
| Glazing system | Maintenance activity | Suggested frequency |
| Windows | Visual inspection of glass for cracks, chips or damage | Monthly visual checks; immediately following reported damage |
| Windows | Inspect frames for corrosion, deterioration, distortion and loose fixings | Annually; six-monthly in exposed or corrosive environments |
| Windows | Inspect seals, gaskets and perimeter joints for deterioration | Annually |
| Windows | Clean and clear drainage channels and weep holes | Six-monthly; more frequently where debris accumulates |
| Windows | Test opening sashes, hinges, locks and restrictors | Six-monthly |
| Glazed doors and entrance systems | Check glass, frames, alignment, hinges, locks, handles and closing mechanisms | Monthly visual and operational checks |
| Glazed doors | Inspect and service door closers, pivots, floor springs and tracks | Six-monthly, or as specified by the manufacturer |
| Automatic doors | Check operation, sensors, safety devices and emergency functions | Daily or weekly user checks, as specified; formal servicing quarterly as a suggested starting point |
| Automatic doors | Formal safety inspection and functional testing | At least annually, or more frequently where required by the manufacturer, risk assessment or applicable standards |
| Curtain walling and shopfront glazing | Inspect accessible glass, frames and visible fixings for damage or displacement | Six-monthly visual checks |
| Curtain walling | Inspect sealants, gaskets, joints and evidence of water ingress | Annually |
| Curtain walling | Detailed façade condition assessment, including high-level components and access provisions | Every 3–5 years as an initial planning interval; adjust according to risk and condition |
| Rooflights and skylights | Inspect for visible damage, discolouration, deterioration and water ingress from a safe location | Quarterly visual checks where practicable, and following severe weather |
| Rooflights | Inspect accessible seals, fixings, surrounding roof interfaces and drainage | Six-monthly, subject to safe access arrangements |
| Rooflights | Assess fragility, access arrangements and fall-protection controls before maintenance work | Before each relevant work activity; review whenever conditions change |
| Rooflights | Detailed condition assessment of ageing or deteriorating systems | Annually for higher-risk or ageing systems; otherwise risk-based |
Important safety note: Any cracked, loose or displaced glazing, failed door safety device, suspected unstable façade component or suspected fragile rooflight should be assessed promptly. Isolate the affected area where necessary and arrange competent inspection and repair. Never access a rooflight on the assumption that it can support a person’s weight.
Safety First: What Are the Key Safety Concerns for Maintenance Personnel?
Glazing maintenance can expose personnel to hazards that are not always obvious during routine inspections.
- Fragile Rooflights and Falls from Height
Rooflights are a significant hazard during roof inspections, cleaning, repairs and other maintenance activities. Glass and translucent plastic panels may be fragile, deteriorated or difficult to distinguish from the surrounding roof surface. Before work begins, the presence and condition of rooflights and other fragile surfaces must be identified. Work should be planned to avoid accessing the roof wherever reasonably practicable. Where access is necessary, appropriate fall-prevention measures, such as secured covers, guardrails, suitable working platforms or an elevated work platform, should be considered. Harness-based systems should only be used as part of a properly assessed and implemented fall-protection arrangement. Personnel must not rely on the apparent strength of a rooflight or surrounding roof sheeting.
- Broken or Damaged Glass
Cracked, chipped, fractured or displaced glazing can present a risk of cuts, falling glass and sudden failure. Damage may also compromise the performance of fire-rated, security-rated or weather-resistant assemblies. Damaged glazing should be assessed by a competent person, and the area should be isolated where necessary to protect occupants and maintenance personnel. Repairs and replacement should be undertaken using appropriate materials and methods. Personnel should not attempt to remove or handle damaged glazing without suitable training, equipment and an established safe system of work.
- Safety Glass and Human Impact
Not all glass is the same. Annealed glass, toughened glass and laminated glass have different characteristics and failure behaviour. Safety glazing is required in specified locations where people may walk into or fall against glass, subject to the applicable building regulations and standards. In Australia, the National Construction Code references AS 1288 for glass selection and installation, with requirements for safety glazing in locations subject to human impact. Maintenance personnel should not assume that glass is safety glass simply because it is thick, appears robust or has been installed in a door or low-level window. Where identification is uncertain, the installed glazing should be verified before work that could affect its safety or integrity is undertaken. Replacement glass must be suitable for the original application, including any requirements for human impact, barriers, fire resistance, thermal performance or other specialised functions.
- Working at Height and External Access
Cleaning and maintaining high-level windows, curtain walling and rooflights can involve ladders, scaffolding, elevated work platforms, suspended access systems or roof-mounted fall-protection equipment. Access arrangements should be selected following a suitable risk assessment, with priority given to preventing falls. Equipment must be appropriate for the task, inspected as required and operated by competent personnel. Where permanent façade access equipment, roof anchors or other fall-protection systems are installed, their inspection, testing and maintenance requirements must also be followed.
- Automatic Doors and Moving Components
Automatic glazed doors introduce additional risks associated with moving panels, closing mechanisms, sensors and electrical controls. Before undertaking maintenance, personnel should follow the manufacturer’s isolation and safe-working procedures. Safety sensors, protective devices and operating functions must be checked following maintenance before the door is returned to service. Defective automatic doors should be taken out of service or otherwise managed to prevent injury until the necessary repairs have been completed.
Why Is a Planned Preventative Maintenance Schedule Essential?
Glazing defects can develop gradually, making routine inspection an important part of preventative building maintenance. Deteriorated seals, blocked drainage paths and worn hardware may initially appear minor but can lead to water damage, reduced performance and expensive remedial works if left unresolved. A structured maintenance regime helps facilities managers identify defects early, schedule repairs, maintain warranties and retain records of inspections and corrective actions. The maintenance plan should cover not only the glass itself, but also the complete assembly: frames, fixings, seals, drainage, hardware, access systems and any associated safety devices.
