A tub of 300 flat plastic packers in assorted thicknesses from 1mm to 6mm. Ideal for levelling, spacing and packing door frames, window frames, flooring and decking. A practical grab-and-go solution for everyday installation work.
Flat plastic packers are one of those products you never think about until you need them, and then you need them urgently. This tub of 300 contains an assorted mix of thicknesses — 1, 2, 3, 4, 5 and 6mm — giving you a range of options on the job without having to root around for the right size. Whether you are fitting windows, hanging doors, laying hardwood flooring or building a deck, these plastic packers handle the repetitive levelling and spacing work that keeps everything square and true.
The tub format makes storage and site access straightforward. Rather than loose bags splitting open in the back of the van, everything is contained and accessible. Having 300 packers in a single tub means you are unlikely to run short mid-job, and the variety of thicknesses means you can fine-tune the fit without improvising with folded cardboard or off-cuts. Proper packers, used correctly, are what separates a tidy installation from one that develops problems six months later.
Where Flat Plastic Packers Get Used
Window and door installation is probably where these flat plastic packers earn their keep most often. Getting a frame plumb and square in an opening that was not necessarily built to be either requires careful adjustment, and these packers make that process methodical rather than approximate. Slip in the right thickness, check the frame, adjust as needed. The plastic construction means they will not compress, rot or deform over time the way timber off-cuts can.
Floor installation is another common application. When laying hardwood or laminate flooring, maintaining a consistent expansion gap around the perimeter is important for long-term performance. Plastic packers provide a reliable, uniform spacer that you can pull out cleanly once the floor is laid, leaving the correct gap without leaving behind any material that might affect the floor edge.
Decking, garden buildings, and general groundworks also benefit from packers when levelling joists or posts off uneven surfaces. A handful of the right thickness packers can take out small variations without the need for cutting or packing with site waste, keeping the job cleaner and quicker.
Assorted Thicknesses in One Tub
The mix of 1mm through to 6mm in a single tub is a practical advantage. In most packing situations, you are combining two or three different thicknesses to reach the exact gap you need. Having all the common sizes to hand means less time searching and more time getting on with the work. The flat profile also means these packers stack neatly and sit stable under a frame without shifting during fixing.
At 300 packers per tub, this is a sensible quantity for trade use. A single window or door installation can easily consume 10 to 20 packers, so a tub like this will cover a full day of frame-fitting or a full room of flooring without any concern about running low.
Pro Tip: When packing a door or window frame, always use at least two packers back-to-back on opposing faces of the frame at each fixing point so the load is spread evenly and the frame does not twist under the fixing screw.
Flat plastic packers are used across a range of installation trades wherever levelling, spacing or alignment is needed. Door and window fitters use them to square frames in openings that are rarely perfectly true. Flooring installers use them as perimeter spacers during hardwood and laminate installation to maintain the correct expansion gap before skirting is fitted. Decking contractors and garden building installers use them to level joists and base structures off uneven surfaces, removing the need for on-site cutting or packing with waste material.
Best For
Window and door frame installation
Hardwood and laminate flooring
Decking and garden building levelling
General levelling and spacing tasks
Available In
1mm thickness
2mm thickness
3mm thickness
4mm thickness
5mm thickness
6mm thickness
Tub of 300 (assorted mix)
Key Features
Plastic construction — will not rot, compress or deform
Flat profile for stable, consistent packing
Assorted mix covers most common gaps in one tub
300 packers per tub — suitable for trade use
Reusable where required
Not suitable for: Not suitable for load-bearing structural applications where engineered shims or grout packs would be required. The 6mm maximum thickness means these packers are not appropriate for filling large voids or correcting significant structural misalignment.
Select the appropriate thickness or combination of thicknesses to fill the gap between the frame and the surrounding structure. Place packers at fixing points and at regular intervals along the frame to distribute the load evenly and prevent bowing. Check for plumb and level as you go, adjusting packer combinations as needed before making any permanent fixings.
For flooring, insert packers around the perimeter of the room against the wall before laying the first board. Use a consistent thickness throughout to maintain a uniform expansion gap. Once the floor is fully laid and any fixings or adhesive are set, remove the packers cleanly and fit skirting or beading to cover the gap.
Assess the gap or misalignment you need to correct and select the appropriate packer thickness or combination of thicknesses.
Position packers at fixing points along the frame, ensuring they are placed on opposing faces where possible.
Check the frame or surface for plumb, level and square using a spirit level before committing to any fixings.
Adjust packer combinations as needed until the frame or surface is correctly positioned.
Fix through the frame and packers into the surrounding structure using the appropriate fixings.
For flooring applications, remove packers once the floor is fully installed and cover the expansion gap with skirting or beading.
How many packers of each thickness are included in the tub of 300?
The tub contains an assorted mix of 1, 2, 3, 4, 5 and 6mm packers. The exact breakdown per thickness is not specified, but the mix is designed to cover the range of sizes most commonly needed for window fitting, door hanging and flooring installation.
Are these packers suitable for outdoor use in decking or garden buildings?
Yes. The plastic construction means these packers will not rot or absorb moisture, making them suitable for outdoor applications such as levelling deck joists, base frames for garden buildings, and other exterior structural packing where small adjustments are needed.
Can I use these as expansion gap spacers for laminate or hardwood flooring?
Yes, flat plastic packers are widely used as perimeter spacers during laminate and hardwood floor installation. Place them against the walls before laying the first row of boards to maintain a consistent expansion gap, then remove them cleanly once the floor is complete and fit skirting to cover the gap.
These flat packers are manufactured from plastic, providing consistent dimensional accuracy across the 1mm to 6mm thickness range. The flat profile ensures stable contact between surfaces without rocking or displacement under load. Plastic construction offers resistance to moisture, compression and deformation, making the packers dimensionally stable over time in both interior and exterior environments. Each tub contains 300 packers in an assorted mix of the six standard thicknesses.
Pack Quantity
300
Thicknesses Included
1mm, 2mm, 3mm, 4mm, 5mm, 6mm
Material
Plastic
Format
Tub
SKU
BFXBSP300
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