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Weatherproofing hardware: protecting alu-clad timber windows & doors

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Aluminium-clad timber windows and doors are engineered to perform for decades – and with the right care, they do. The hardware holding your triple-glazed windows in motion operates under considerable load, exposed to weather and seasonal movement year after year.

A consistent maintenance routine is part of protecting your investment and, in high-performance builds, the thermal and airtight integrity of the building as a whole. This guide covers what that maintenance involves, how frequently it is needed, and when professional servicing is the right call.

Key Takeaways

  • Hardware maintenance twice a year is the recommended minimum. For exposed properties and those within approximately one mile of the coast, monthly maintenance is recommended to prevent corrosion.
  • Use non-freezing lubricants that do not accumulate dust to protect moving parts; general-purpose oils attract grit and accelerate wear.
  • Drainage channels must be kept clear. Blockages risk moisture reaching the engineered timber core, which - unlike the aluminium cladding - is susceptible to sustained water contact.
  • Stiffness in sash mechanisms is often load-related, not hardware failure. Hinges can be adjusted to restore smooth operation without hardware replacement.
  • Keep dated maintenance records: most manufacturer warranties require evidence of routine care as a condition of cover.

Why hardware maintenance matters in aluminium-clad timber systems

The external aluminium shell of a composite window is highly durable, but in areas with heavy atmospheric pollution or salt-laden air, the cladding itself needs regular cleaning to prevent surface degradation.
The moving parts beneath it - hinges, espagnolettes, friction stays and multi-point locks - operate under continuous mechanical load.

They carry the weight of the sash and maintain compression on the seals that keep the window airtight.

In a passive house or low-energy build, the stakes are higher. The multi-point locking mechanism creates a compression seal that holds the sash tight against the gaskets and underpins system airtightness. A worn or misaligned locking point could reduce seal performance and, in turn, increase air leakage - with measurable knock-on effects for the window's own airtight contribution to the building envelope.

How often should aluminium-clad window hardware be serviced?

Twice a year is the recommended minimum, inspecting and lubricating hinges, checking locking point alignment, and clearing drainage channels, with October or November as the most important service window.

For properties within approximately one mile of the coast, hardware inspection and cleaning every month is more appropriate. Salt air and particulates introduce accelerated corrosion risk standard hardware grades may have a reduced service life. It is worth discussing marine-grade door handles and appropriate surface finishes at quotation stage.

A pre-winter check in October or November catches potential issues before the heating season begins.

Cleaning powder-coated aluminium frames: safe products and what to avoid

Powder-coated aluminium is robust, but not impervious. The appropriate cleaning method is warm water with a mild cleaning agent applied with a soft sponge or cloth.

Abrasive pads, spirit-based solvents, and caustic cleaners can all breach the powder coat, exposing the substrate to oxidation. Once the protective finish is compromised, surface corrosion and visible bubbling follow.

Pay particular attention to hinges, locking points, and any hardware recess where water and debris collect. Waxing the aluminium cladding after cleaning is recommended in Norrsken's maintenance manual for all locations; in coastal environments, or anywhere with elevated atmospheric pollution, doing so more regularly helps protect the finish from salt deposition and particulate build-up between service visits.

Lubrication and adjustment for tilt-and-turn systems

Most European tilt-and-turn systems (such as those produced by Roto, Siegenia, or Maco) include adjustable hinges and multi-point locking mechanisms designed for periodic servicing.

Each hinge should be lubricated with a non-freezing Teflon-based oil; espagnolettes and multi-point locking points take a light non-freezing oil. All surfaces should be cleaned before lubrication, ideally once or twice a year as a baseline. Avoid general-purpose oils: they attract dust and grit, which accelerates wear rather than reducing it.

If a window feels stiff to operate, the cause could be load-related. Heavy triple-glazed sashes exert large force on hinges; if adjustment pins are not correctly set, or have shifted over time, the sash may bear down on the frame unevenly.

In inward-opening windows, including tilt-and-turn, the espagnolette's mushroom pins draw the sash against the perimeter gasket when the handle is locked. That compression is the seal. Horizontal, vertical and gasket pressure can each be adjusted independently; Norrsken's maintenance manual covers the adjustment procedure in full (Figure 8.2), and these parameters should be checked as part of any professional service visit.

Drainage channels: protecting the timber core

Most aluminium-clad timber frames incorporate small drainage channels designed to route moisture away from the timber core.

Debris such as dust, leaves, or insects can block them over time and, unlike the aluminium shell, the structural timber core of the composite system is susceptible to sustained moisture contact.

Blocked drainage channels allow water to pool within the frame cavity, which can eventually reach the timber core beneath the cladding. Inspecting and clearing drainage channels should be a fixed item on every seasonal maintenance check.

Maintaining performance in Passive House and low-energy Builds

In passive house and other high-performance builds, the frame-to-wall junction - where the window installation meets the building's airtight layer - is a critical detail for airtightness and long-term envelope durability.

Maintenance visits are a useful opportunity to inspect it from the accessible faces: checking that the external perimeter seal has not cracked or separated, that any exposed internal reveal beads remain intact, and that drainage at the cill is functioning correctly.

Most high-performance window warranties specify minimum maintenance intervals as a condition of cover.

Retaining dated records of cleaning, lubrication, and any professional servicing is essential, particularly in the first few years following completion, when any installation-related issues are most likely to emerge

When to seek professional servicing

Routine maintenance covers a large proportion of what hardware needs to remain in good condition, and much of it is straightforward to carry out.

There are, however, circumstances that warrant professional attention:

  • Persistent stiffness that does not resolve after correct lubrication and hinge adjustment.
  • Visible misalignment between sash and frame, particularly where it affects locking point engagement.

For further guidance on weatherproofing considerations in demanding environments, this overview from The Coastal Group is a useful reference point.

Aluminium-clad timber windows are designed for a service life of 50 years or more, but lifespan depends, in large part, on how well they are looked after.

The routine is simple, and the first few years are the most important. If questions arise at any stage, the Norrsken team is available to advise.

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