Bulk Buying 28mm Flat Glazing Packers: Which Thicknesses Do Installers Use Most?

When installers, glazing firms, and trade buyers order 28mm flat glazing packers in bulk, the main question is usually not whether they need them — it is which thicknesses they should stock most heavily.

Our FP28 flat glazing packers are supplied in packs of 1000, in thicknesses from 1 mm to 6 mm, and are designed for 28 mm glazing systems across uPVC, aluminium, and timber installations. For trade customers, buying the right mix of thicknesses matters because it affects day-to-day installation speed, stock efficiency, and whether the right support is always available on site.

What Our FP28 Range Covers

We offer FP28 glazing packers in the following thicknesses:

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

Each thickness is intended for a different level of correction or support, from fine adjustment at the lower end to larger gaps and heavy-load situations at the upper end. The product is made from polypropylene, measures 28 mm × 100 mm, and is suitable for windows, glazed units, doors, curtain walling, and conservatories.

The Thicknesses Installers Usually Reach for Most

For most everyday glazing work, the most commonly used FP28 thicknesses are usually:

• 3 mm
• 4 mm
• 5 mm

That is because these thicknesses sit in the middle of the range and cover the broadest set of routine installation needs.

We position 3 mm as standard everyday packing for general window installations, standard levelling work, and typical glazing support. We position 4 mm for moderate gap filling and slightly misaligned frames. We position 5 mm for larger adjustments and stronger support, especially where heavier sealed units are involved. For many installers, these three thicknesses handle the majority of repeat-use trade work.

Why 3mm FP28 Packers Are a Core Trade Size

Our 3 mm FP28 packers are one of the most practical sizes to keep in volume because they are intended for:

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

For trade buyers, that makes 3 mm one of the safest bulk-buying choices. It is the kind of thickness that fits a wide range of routine jobs without being too light for standard support or too heavy for straightforward installations.

Why 4mm FP28 Packers Are Also Popular in Bulk

Our 4 mm FP28 packers are useful where installers need something more substantial than standard packing but not as heavy-duty as 5 mm or 6 mm.

We recommend 4 mm for:

• medium adjustments
• supporting heavier sections
• aligning slightly misaligned frames

That makes it a strong trade size for installers who regularly work on jobs where openings are not perfectly even or the support requirement is slightly higher than normal.

Why 5mm FP28 Packers Matter for Heavier Support Work

Our 5 mm FP28 packers are designed for:

• larger gaps
• heavier sealed units
• structural levelling requirements

This is why many installers and trade buyers keep 5 mm in bulk alongside 3 mm and 4 mm. Where the glazing unit is heavier or the installation needs stronger support, 5 mm becomes a very practical stock item rather than a specialist one.

Where 1mm and 2mm FP28 Packers Fit Into Bulk Buying

Our 1 mm and 2 mm FP28 packers are usually more useful as supporting stock rather than primary bulk lines.

We recommend 1 mm for:

• final alignment adjustments
• removing small gaps
• fine-tuning after main packing

We recommend 2 mm for:

• slightly uneven surfaces
• minor frame inconsistencies
• light levelling under glazing units

These are valuable thicknesses to have available, but they are generally used for fine correction work rather than as the main packers installers reach for on most jobs. For many trade buyers, they make sense as lower-volume support sizes within the broader FP28 range.

Where 6mm FP28 Packers Fit Into Bulk Buying

Our 6 mm FP28 packers are intended for:

• large gaps or uneven openings
• high load-bearing points
• base packing under frames

Because of that, 6 mm is usually the most specialist thickness in the range. It is important for firms that regularly handle more demanding installations, but it is not always the first thickness every buyer needs in high volume. For some trade customers, 6 mm is best kept as part of a complete range rather than as the main bulk-purchase line.

A Practical Bulk-Buying Approach for Trade Installers

A sensible way to bulk buy FP28 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 heavy-load requirements

For many trade buyers, this means the heaviest stock focus will naturally fall on 3 mm, 4 mm, and 5 mm, with the other sizes used to round out the full range. That creates a balanced stock profile without overloading on specialist thicknesses. This is an inference based on the stated uses of each thickness on the FP28 product page.

Why Many Trade Buyers Stock the Full FP28 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 FP28 range available.

That is because our FP28 packers are used across:

• uPVC installations
• aluminium installations
• timber installations
• windows
• doors
• glazed units
• curtain wall systems
• conservatories

Different sites and frame conditions create different support needs, so trade buyers who want to avoid delays often choose to keep the full range in stock rather than risk being caught without the correct thickness. We also offer bulk trade pricing for larger quantities, which supports that buying approach.

Why FP28 Works Well for Bulk Orders

Our FP28 glazing packers are a practical bulk-buying product because they combine:

• a 28 mm × 100 mm format
• 1 mm to 6 mm thickness options
• non-compressible polypropylene
• suitability for multiple frame materials
• packs of 1000
• UK-held stock
• same-day dispatch before 1 PM, Monday to Friday

For trade customers, that combination makes it easier to standardise stock and reorder quickly when needed.

Final Thoughts

If you are bulk buying 28mm 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 and heavier-duty support.

For many trade buyers, the best approach is to build bulk stock around 3 mm, 4 mm, and 5 mm, while keeping the full FP28 range available for flexibility across different types of glazing work.