24mm Flat Plastic Packers | Compact Levelling & Packing Shims

24mm Flat Plastic Packers Glazing Precision and Stability Spacers

Achieve perfectly level, stable and long‑lasting installations with 24mm flat plastic packers designed for precise glazing, window and door frame spacing.

These 24mm Flat Plastic Packers Glazing Precision and Stability Spacers are professional‑grade
shims designed to deliver accurate, stable and long‑lasting support wherever a controlled gap or packing is required.
Widely used in the glazing and construction trades, they are ideal for levelling and supporting window and door
frames, glass units, cladding, battens, joists and furniture components.

Manufactured from tough, high‑density plastic, these packers provide non‑compressible, consistent thickness
support under load, helping to prevent frame twist, sash binding and stress on glass or hardware. The 24mm width
is perfect for most modern uPVC, aluminium and timber frame systems, fitting easily within standard profiles and under
frame edges without fouling fixings.

24mm flat plastic glazing packers are an essential part of good installation practice, allowing installers to:

• Set accurate sightlines and even gaps around glass units.
• Support frames at structural fixing points without crushing or distortion.
• Bridge minor irregularities in brickwork, lintels, cills and subframes.
• Fine‑tune levels for frames, cills, thresholds and curtain walling.
• Use as precision spacers in joinery, shopfitting and interior fit‑out.

Unlike improvised timber or cardboard packing, these plastic packers will not absorb moisture, swell or break down over
time. Their consistent thickness helps maintain alignment and load distribution for the life of the installation, making
them ideal for use in windows and doors designed to meet modern British and European performance standards
when used as part of a compliant installation system.

Common trades using these 24mm plastic shims include window fitters, carpenters, joiners, conservatory installers,
dryliners, tilers and kitchen fitters. They are equally at home on site or in the workshop, used for everything from
setting out studwork and battens to levelling worktops, cabinets and built‑in furniture.

Specifications

• Product type: 24mm flat plastic packers / glazing spacers
• Width: 24 mm (nominal)
• Form: Flat, non‑compressible plastic shims
• Material: High‑density plastic (moisture and rot resistant)
• Typical applications: Glazing packers, window and door frame spacing, levelling shims, joinery and fit‑out packing
• Compatibility: Suitable for use with uPVC, aluminium and timber frames, masonry, concrete, steel and timber substrates
• Environment: Indoor and covered outdoor use – ideal for window and door installations, conservatories and facades
• Performance: Non‑compressible under typical window and door frame loads when correctly supported

24mm Flat Plastic Packers Key Features

• 24mm width for modern frames: Sized to suit the majority of contemporary uPVC, aluminium and timber glazing systems.
• Flat, consistent profile: Ensures accurate packing thickness for precise levelling and spacing.
• Non‑compressible plastic: Maintains support under load, helping prevent frame twist, sagging or movement over time.
• Moisture‑resistant and durable: Will not rot, swell or delaminate like timber packers in damp conditions.
• Multi‑trade versatility: Ideal for glazing, carpentry, joinery, tiling, shopfitting and general construction.
• Easy to cut and position: Can be trimmed on site with a knife or snips to suit exact lengths and packing points.

24mm Flat Plastic Packers Frequently Asked Questions

1. What are 24mm flat plastic packers used for?

24mm flat plastic packers are used wherever a reliable, precise gap or support is needed. The most common use is as
glazing packers for supporting window and door frames and glass units. They are also widely used as
levelling shims under:

• uPVC and aluminium window and door frames
• Timber frames, cills and thresholds
• Studwork, battens and cladding rails
• Cabinets, worktops and furniture
• Flooring battens and joists where minor height adjustment is required

2. Why use plastic glazing packers instead of timber offcuts?

Plastic packers offer several advantages over improvised timber or cardboard:

• Consistent thickness: You get predictable, accurate packing for precise levelling.
• Non‑absorbent: They will not take on moisture, swell or rot in damp reveals or cills.
• Non‑compressible: They maintain support under long‑term loading, helping prevent frame movement.
• Professional practice: Using dedicated glazing packers aligns with good installation practice and manufacturer guidance for many modern window systems.

3. Can these 24mm packers be used with uPVC and aluminium windows?

Yes. These 24mm flat plastic packers are ideal for modern uPVC and aluminium frames. They are commonly
used under frame fixing points, at hinge positions and beneath glass units to ensure the load is correctly supported and
transferred to the structure. Always follow the window or door manufacturer’s specific packing and fixing instructions.

4. Are these packers suitable for exterior or damp environments?

The high‑density plastic material is moisture‑resistant and does not rot or swell, making these packers
suitable for use in window and door reveals, conservatories and other damp‑prone areas. They should,
however, always be used as part of a properly detailed and weather‑sealed installation to prevent water ingress into the
building fabric.

5. How do I choose the right thickness and position for packers?

In glazing and frame installation, packers are normally placed:

• Under frame fixing points to support the frame where it is anchored to the structure.
• At hinge and lock positions to carry hardware loads.
• At specified positions beneath glass units to distribute the weight evenly.

Thickness is chosen to achieve the required level and gap. Many installers carry an assortment of packer thicknesses
(e.g. 1 mm, 2 mm, 3 mm, 5 mm, 10 mm) and combine them as needed under the 24mm wide footprint. Always avoid point‑loading
and ensure packers are fully supported and in firm contact with both surfaces.

Common Uses & Installation Tips

Typical Applications

• Supporting and levelling window and door frames in brick, block or timber openings.
• Packing beneath glass units in uPVC, aluminium and timber frames.
• Levelling stud partitions, door linings and timber frames.
• Shimming kitchen cabinets, wardrobes and built‑in furniture.
• Acting as spacers under tiling battens, flooring battens and secondary framing.

Installation Tips

1. Prepare the opening: Check reveals, cills and structural supports for loose material and clear debris and dust.
2. Dry fit and level: Offer the frame or component into position and use a level to identify where packers are needed to correct gaps and twists.
3. Position packers: Place 24mm packers at key load points (e.g. corners, mid‑spans, hinge points) ensuring full contact with the substrate.
4. Fix in place: Once the frame is correctly packed and level, fix through or alongside the packers using appropriate frame anchors or screws.
5. Check alignment: Re‑check plumb, level and square after tightening fixings; adjust packers if required before finishing.
6. Trim if necessary: If packers protrude beyond visible lines, trim them carefully with a utility knife or snips.

For glazing and external joinery, always follow the relevant product manufacturer’s instructions and local building
regulations to ensure compliance with performance and safety requirements.