Curtain Wall and Facade Maintenance: What a UK Building Owner Should Actually Do
A well-installed curtain wall or rainscreen facade should give 40+ years of service — but only with a maintenance regime. This guide sets out the inspection intervals, what to look for, and what triggers repair, for the four facade elements most UK building owners are responsible for: curtain walling, rainscreen cladding, aluminium windows and aluminium doors.
Why Maintenance Matters
Every facade defect gets more expensive to fix the longer it's left. A single displaced gasket caught at year 5 is a two-hour rope-access repair. The same defect left until year 15 is often a bay full of water-damaged insulation and internal finishes. On residential buildings under the Building Safety Act, the Accountable Person has a legal duty to actively manage the building's safety — including the facade.
Inspection Intervals
| Element | Recommended interval |
|---|---|
| Visual inspection (ground level) | Annual |
| Close-up inspection (rope access / MEWP) | Every 5 years |
| Gasket and sealant condition survey | Every 5–10 years |
| Fixing pull-out testing (rainscreen) | Every 10 years |
| Cavity barrier condition survey | Every 10 years or after any facade opening-up |
| Full facade condition survey | Every 10 years |
What to Look For — Curtain Walling
- —Gasket condition — hardening, shrinkage or displacement at corners
- —Sealant condition at movement joints and interfaces — cracking, loss of adhesion
- —IGU seal failure — internal condensation between panes
- —Pressure plate and cap fixings — corrosion, backed-out screws
- —Bracket connections at slab edge — corrosion at bi-metallic contact points
- —Signs of water ingress internally — staining below sills, damp on cold-bridge locations
What to Look For — Rainscreen Cladding
- —Panel fixings — visible corrosion, loose fixings, panel movement in wind
- —Panel finish — coating breakdown, fading, staining
- —Open joints — check they're clear (not blocked by debris) so the cavity keeps drying
- —Flashings at head, base and around openings — sealant and lap condition
- —Cavity ventilation — check base and top vents are clear
- —Cavity barriers — only visible after opening-up; combine with any fixing pull-out testing
What to Look For — Aluminium Windows and Doors
- —Ironmongery — hinges, closers, locks, gaskets on opening lights
- —Perimeter sealant — cracking, gaps, colour degradation
- —Drainage slots — clear of debris
- —Powder-coat finish — chalking, coating loss, minor damage
- —Threshold seals on doors — the highest-wear component on any facade
Repair vs Recoat vs Replace
Most facade defects can be repaired or recoated rather than replaced — but the decision hinges on the underlying substrate. Gasket, sealant, ironmongery, single-panel replacement and localised recoating are all repair-scale interventions. Recoating a full elevation is planned works (typically at year 25–30 for aluminium powder coat). Replacement of the whole system is only justified where the underlying carrier or fixings have failed, or where fire-safety compliance triggers a re-clad.
Frequently Asked Questions
Can we do facade inspections in-house?
Ground-level visual inspection yes. Close-up inspection requires rope-access or MEWP-competent inspectors familiar with facade systems — outsource this to a facade specialist.
How long does aluminium powder coating last?
Good-quality powder coating (Qualicoat Class 2, marine-grade for coastal sites) is warranted 15–25 years. Actual life often exceeds this — recoating is typically triggered by aesthetics rather than substrate failure.
What triggers a full facade recoat?
Coating chalking or fading beyond acceptable aesthetics, typically at year 25–30 for original powder coat. The recoat itself is done in-situ from rope access or scaffold with the correct etch primer and fluoropolymer topcoat.