Horseshoe plastic packers for levelling and spacing around bolts and fixings. Slide one in around the bolt without removing it, and the frame or panel sits at true height and square before you tighten it off.
Glazing frames, facade panels, cladding, doors: anywhere a fixing needs a shim in seconds.
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.
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 |