Bulk Buying 24mm Flat Glazing Packers: Which Thicknesses Do Installers Use Most?

When installers, glazing firms, and trade buyers order 24mm flat glazing packers in bulk, the main decision is usually not whether they need them, but which thicknesses they should keep most heavily in stock.

Our FP24 flat glazing packers are supplied in packs of 1000, in thicknesses from 1 mm to 6 mm, and are designed for 24 mm glazing systems used in uPVC, aluminium, and timber frames. For trade customers, choosing the right thickness mix matters because it affects installation speed, stock efficiency, and whether the correct support is always available when needed.

What Our FP24 Range Covers

We offer FP24 glazing packers in the following thicknesses:

• 1 mm
• 2 mm
• 3 mm
• 4 mm
• 5 mm
• 6 mm

They are designed as precision-moulded shims for spacing, levelling, and supporting sealed glass units, and they are suitable for windows, doors, conservatories, glazed units, and curtain walling. Each packer is made from polypropylene, measures 24 mm × 100 mm, and is designed to remain stable and dimensionally true under load.

The Thicknesses Installers Usually Reach for Most

For most everyday glazing work, the FP24 thicknesses installers are most likely to use most often are:

• 3 mm
• 4 mm
• 5 mm

That is because these three sit in the middle of the range and cover the broadest set of routine support and levelling needs.

We position 3 mm as standard everyday use for typical window and door installations, standard levelling, and general glazing work. We position 4 mm for moderate gap filling, heavier sections, and uneven openings. We position 5 mm for larger adjustments, heavier sealed units, and structural support points. Based on those stated uses, these are the most practical core bulk-buying sizes for many installers.

Why 3mm FP24 Packers Are a Core Bulk Size

Our 3 mm FP24 packers are one of the safest thicknesses to keep in volume because they are intended for:

• typical window and door installations
• standard levelling and support
• general glazing work

For trade buyers, that makes 3 mm a core stock line. It is the size that covers a wide range of routine jobs without being too light for standard support or too heavy for everyday installations.

Why 4mm FP24 Packers Are Common in Trade Orders

Our 4 mm FP24 packers are useful where a job needs more noticeable correction than a standard packer can provide.

We recommend 4 mm for:

• medium gaps
• supporting heavier sections
• aligning uneven openings

That makes it a strong bulk-buying size for installers who regularly encounter openings that are not perfectly even or units that need a bit more support than standard installations.

Why 5mm FP24 Packers Matter for Heavier Support Work

Our 5 mm FP24 packers are designed for:

• larger spacing requirements
• heavier sealed units
• structural support points

Because of that, 5 mm is an important thickness to keep in bulk alongside 3 mm and 4 mm. Where the glazing unit is heavier or the support point is more demanding, 5 mm is often the correct choice rather than trying to make lighter thicknesses do a heavier-duty job.

Where 1mm and 2mm FP24 Packers Fit Into Bulk Buying

Our 1 mm and 2 mm FP24 packers are usually better thought of as support sizes rather than the main bulk lines.

We recommend 1 mm for:

• final levelling adjustments
• removing slight gaps
• fine-tuning after main packing

We recommend 2 mm for:

• slightly uneven frames
• light spacing adjustments
• small alignment corrections

These are very useful sizes to have available, but they are generally used for fine correction work rather than as the primary stock used on most repeat installations. For many trade buyers, they make sense as lower-volume support stock within a wider FP24 range.

Where 6mm FP24 Packers Fit Into Bulk Buying

Our 6 mm FP24 packers are intended for:

• large gaps or uneven substrates
• base packing under frames
• high load-bearing positions

That makes 6 mm the most specialist thickness in the range. It is important for installers handling more demanding jobs, but it is not always the first thickness every buyer needs in the highest volume. For many trade customers, 6 mm is best kept available as part of a complete range rather than as the main bulk order line.

A Practical Bulk-Buying Approach for Trade Installers

A sensible way to bulk buy FP24 glazing packers is:

• stock 3 mm as a core everyday thickness
• stock 4 mm for moderate corrections and heavier sections
• stock 5 mm for larger adjustments and stronger support
• keep 1 mm and 2 mm available for finishing and fine adjustment
• keep 6 mm available for bigger gaps and high load-bearing requirements

For many trade buyers, this means the main stock focus will naturally fall on 3 mm, 4 mm, and 5 mm, while the other sizes round out the range and give installers flexibility when the job calls for something more specific. This is an inference based on the stated uses of each FP24 thickness.

Why Many Trade Buyers Stock the Full FP24 Range

Even if installers tend to use 3 mm, 4 mm, and 5 mm most often, there is still strong value in keeping the full 1 mm to 6 mm FP24 range in stock.

That is because our FP24 packers are suitable for:

• uPVC frames
• aluminium frames
• timber frames
• windows
• doors
• conservatories
• glazed units
• curtain walling

Different frame materials, site conditions, and unit weights create different support requirements, so trade buyers who want to avoid delays often keep the full range available rather than risk being caught without the correct thickness. We also offer bulk trade pricing for larger quantities, which supports that buying approach.

Why FP24 Works Well for Bulk Orders

Our FP24 glazing packers are a practical bulk-buying product because they combine:

• a 24 mm × 100 mm format
• 1 mm to 6 mm thickness options
• polypropylene construction
• suitability for multiple frame materials
• packs of 1000
• UK-held stock
• same-day dispatch before 1 PM, Monday to Friday

For trade buyers, that combination makes it easier to standardise stock, keep teams supplied, and reorder quickly when required.

Final Thoughts

If you are bulk buying 24mm flat glazing packers, the thicknesses installers are most likely to use most often are usually 3 mm, 4 mm, and 5 mm, because those sizes cover the broadest range of routine support, levelling, and adjustment work. 1 mm and 2 mm are valuable for finer corrections, while 6 mm is there for larger gaps, base packing, and higher load-bearing support.

For many trade buyers, the best approach is to build bulk stock around 3 mm, 4 mm, and 5 mm, while still keeping the full FP24 range available for flexibility across different kinds of glazing work.