30mm Flat Glazing Packers

30mm Flat Glazing Packers are designed for glazing jobs where a slightly wider packer provides better contact, improved stability and easier positioning beneath sealed units or within deeper glazing rebates.

Measuring 30mm × 100mm, these packers offer a broader support face than narrower flat packers while remaining easy to position during installation. This makes them a practical choice for window and door fitters working with larger rebates, heavier sealed units or installations where extra bearing width helps keep the glass unit stable and correctly seated.

Each packer is manufactured from durable polypropylene to provide firm, non-compressible support under load. Unlike timber offcuts or soft shims, these plastic packers retain their thickness, resist moisture and help maintain the correct spacing long after the installation is complete.

The full 1–6mm thickness range allows installers to make anything from fine adjustments to larger spacing corrections. Each thickness follows standard colour coding, making selection quick and simple on site.

Key Benefits

• Wider 30mm profile for improved contact and stability
• Helps support sealed units evenly within the frame
• Useful for larger glazing rebates and wider support points
• Non-compressible polypropylene construction
• Moisture-resistant, rot-proof and suitable for external work
• Colour-coded thicknesses for fast identification
• Suitable for uPVC, aluminium and timber window and door installations

Common Applications

• Supporting sealed glass units during glazing
• Levelling and spacing window and door units
• Packing within wider glazing rebates
• Fine adjustment during frame and glass positioning
• General glazing, conservatory and curtain walling work

Choosing the Right Thickness for 30mm Flat Glazing Packers

Choosing the correct thickness helps the unit sit correctly without creating unnecessary pressure on the glass edge, gasket or frame. The 30mm width gives extra contact area, while the thickness selected determines how much adjustment or support is added.

1mm Green – Fine Correction

The 1mm packer is used where the unit is almost correctly positioned and only a small adjustment is needed.

Best for:

• Fine levelling
• Final positioning
• Correcting very small gaps
• Layering with other sizes for precise adjustment

2mm Black – Light Spacing

The 2mm packer is useful for small corrections where a little more lift or spacing is required.

Best for:

• Minor unevenness
• Small glazing gaps
• Light support under sealed units
• Combining with 1mm or 3mm packers

3mm White – Everyday Glazing Support

The 3mm packer is a common general-purpose thickness for routine glazing work.

Best for:

• Standard glass positioning
• General window and door installations
• Supporting sealed units evenly
• Everyday site use

4mm Grey – Medium Adjustment

The 4mm packer is useful where a more noticeable correction is needed without moving straight to a larger spacer.

Best for:

• Medium gaps
• Slightly uneven rebates
• Additional support under heavier sections
• Balancing the unit during installation

5mm Blue – Larger Spacing

The 5mm packer gives stronger spacing support where the gap or adjustment requirement is more significant.

Best for:

• Larger glazing gaps
• Heavier sealed units
• Base support points
• Installations needing firmer lift or spacing

6mm Red – Maximum Standard Adjustment

The 6mm packer is the thickest option in this range and is used when the installation requires a larger correction or stronger bearing point.

Best for:

• Large spacing requirements
• Base packing
• Load-bearing support areas
• Uneven openings or deeper rebates

Installer Tip

When working with larger sealed units, avoid relying on a single thick packer if a more precise combination would give better support. For example, combining 2mm and 3mm packers can allow finer adjustment than using one thicker packer alone. The wider 30mm face helps spread contact, but packers should still be positioned carefully to avoid pressure points.

Why the 30mm Width Matters

A 30mm flat packer can be useful where installers want a broader support area than 20mm, 24mm or 28mm packers provide. The wider profile helps create stable contact under the unit, especially in deeper glazing channels or where the frame design allows more bearing width.

Using the correct packer size and thickness helps:

• Keep sealed units properly seated
• Reduce the risk of edge stress
• Maintain frame and glass alignment
• Prevent movement, rattling or uneven support
• Improve the long-term reliability of the installation