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At a Glance: Key Applications
Use Window Packers for: Quick and reliable packing around bolts, anchors and fixings—ideal for glazing frames, façade panels and external cladding.
Window Packers: A Technical Overview
Window Packers provide a fast, accurate solution for levelling, spacing and aligning building elements during installation. Their practical horseshoe shape allows easy slide-in around bolts and screws, saving time and increasing accuracy on-site.
Each thickness is colour-coded for quick selection, and they remain stable in damp or exposed environments. Perfect for cladding, glazing, framing, and cabinetry, they are trusted across multiple trades for their convenience and performance.
Core Features & Specifications
- Available in multiple thicknesses: 1mm to 10mm
- Slotted horseshoe shape allows fast placement over anchor points
- Colour-coded by size for fast, error-free selection
- Maintains shape and size under load
- Moisture-resistant and suitable for internal or external applications
The Window Packers Advantage
- Speeds up frame and cladding alignments during installation
- Reduces packing errors with clear colour coding
- Stable and long-lasting even in humid or wet environments
- Compatible with a wide range of structural materials
Compatible Substrates
- Timber: Ideal for use under timber frames, battens or sill plates.
- Steel: Works with steel studs, structural beams or facade channels.
- Aluminium: Commonly used in curtain wall and window frame systems.
- Concrete & Masonry: Suitable for blockwork, slab edges or wall reveals.
- Fibre Cement / Plasterboard: For tolerance adjustment during internal fit-outs.
Storage & Shelf Life Considerations
Store in a dry, shaded environment. Product has no expiry and remains dimensionally stable over time when kept clean and out of direct sunlight.
Frequently asked questions
Can these packers be used in external wall cladding?
Yes, these packers are suitable for external cladding installations. Their moisture resistance and dimensional stability prevent issues often seen with less robust packing materials.
Will Window Packers compress or deform under load?
No, these packers are designed to maintain their shape under typical building pressures. They will not compress like foam or fibre shims, preventing frame settlement and ensuring long-term alignment.
How do I select the correct packer thickness on site?
Each packer thickness is colour-coded for quick identification. This allows for fast, accurate selection without needing to measure each shim, speeding up installation.
Are these packers suitable for high-load structural bearing applications?
No, Window Packers are not designed for high-load bearing under structural beams or columns. They should not replace engineered support systems where structural integrity is paramount.
Applications and benefits
| Application | Key benefit | Primary trades |
|---|---|---|
| Window and door frame levelling | Ensures precise frame alignment at anchor points, preventing settlement or twisting that can lead to operational issues. | Glaziers, Builders |
| External wall and cladding installations | Provides consistent spacing for panels, maintaining true lines and preventing uneven finishes that compromise appearance and weatherproofing. | Builders, Cladding Installers |
| Structural frame packing | Compensates for uneven substrates or misaligned battens, creating a level and stable foundation for subsequent elements. | Builders, Carpenters |
| Joinery and cabinetry alignment | Allows for fine thickness adjustments during installation, ensuring plumb and level fit-outs that meet architectural standards. | Joiners, Fitout Contractors |
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Window & Door Frame Packing | Corrects reveal and level around anchor points | Glaziers, Builders |
| Cladding Installation | Keeps panels straight despite batten irregularities | Builders, Cladding Installers |
| Joinery & Cabinetry Fit-Out | Ensures flush installs during trim-out or panel alignment | Joiners, Fit-Out Teams |
| Precast Panel Setup | Provides spacing tolerance before fixing heavy items | Builders, Structural Contractors |
Product limitations
- Not for: High-load bearing under structural beams or columns. These packers are designed for precise alignment and levelling, not for primary structural support.
- Do not use: As a substitute for engineered support systems or adhesives where structural integrity relies on specific bonding or complex load distribution mechanisms.
- Reusability: For critical or compliance-driven applications, always use new packers. This ensures maximum performance and strict adherence to project specifications.
Safety and handling
Personal protective equipment
Gloves are recommended when trimming packers to protect hands from potential sharp edges produced during cutting.
Ventilation
No special ventilation is required for handling or installation of these packers.
First aid
- Ingestion: The material is non-toxic. If a child ingests a packer, seek medical advice as a precaution.
Storage and disposal
Store in a cool, dry area away from direct sunlight to maintain material integrity. Under these conditions, the shelf life is unlimited. Dispose of waste packers according to local regulations for plastic materials.
Substrate guide
Correct substrate preparation is essential to ensure stable alignment and long-term performance for any packed element.
Timber
Surface prep: Ensure surfaces are clean, dry, and free from loose debris. Remove any splinters or rough edges that could interfere with stable seating.
Primer: Not required. The packers function as a non-compressive spacer, providing stable spacing without relying on adhesion.
Steel
Surface prep: Clean surfaces thoroughly to remove rust, scale, grease, or other contaminants. Ensure a flat, stable contact area for the packer.
Primer: Not required. Packers function as a non-compressive spacer and do not require priming of steel surfaces.
Aluminium
Surface prep: Clean any oxidation, dust, or oils from the surface to ensure proper seating. The contact area must be stable.
Primer: Not required. The non-metallic composition of the packers prevents galvanic corrosion when in contact with aluminium frames.
Concrete and masonry
Surface prep: Remove loose concrete, mortar, dust, or laitance. Ensure the surface is sufficiently level for the packer to seat correctly and distribute load evenly.
Primer: Not required. Packers provide stable separation from uneven surfaces without the need for additional primers.
Fibre cement and plasterboard
Surface prep: Ensure surfaces are clean, dry, and structurally sound. Remove any loose dust or debris resulting from cutting or installation.
Primer: Not required. Packers support and align panels during fit-out without requiring surface priming.
Window Packers Physical Properties
| Property | Value |
|---|---|
| Material Type | Rigid Polymer |
| Appearance | Slotted Horseshoe |
| Colour | Colour-coded by thickness |
| Compressive Strength | Non-deforming under normal load |
| Bed Thickness | 1 mm – 10 mm |
| Thickness Options | 1 mm, 1.5 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm |
| Substrate Compatibility | Window frames, Door frames, Cladding, Curtain walls, Joinery, Furniture |
| Moisture Resistance | Yes |
| Dimensional Stability | Yes |
| Shelf Life | Unlimited |
| Storage Conditions | Cool, dry area away from direct sunlight |
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