20mm Flat Glazing Packers

Type FP20 Glazing Packers provide consistent, accurate spacing for 20 mm glass and sealed unit installations.

They’re essential for keeping glazed units level, evenly supported, and correctly aligned within the frame — helping prevent glass edge stress, cracking, or distortion.

Made from polypropylene, these flat packers resist compression and weathering while maintaining their exact thickness under load. Each size is colour-coded for quick identification, making them a must-have for any installer working with uPVC, aluminium, or timber glazing systems.

Benefits at a glance:

• Maintains correct spacing and alignment of glazed units
• Prevents edge pressure, cracking, and rattling
• Precise, non-compressible thickness for reliable load support
• Works with uPVC, aluminium, and timber frames
• Suitable for windows, doors, and conservatories

Trusted by glazing professionals for consistent performance and faster, cleaner installations.

What Each Thickness is Used For

1 mm – Fine Adjustment & Final Levelling

Used when only minimal correction is required.

Best for:

• Final alignment adjustments
• Removing very small gaps
• Fine-tuning after main packing

2 mm – Minor Levelling & Light Corrections

Ideal for small inconsistencies in frames or openings.

Best for:

• Slightly uneven surfaces
• Minor spacing corrections
• Light levelling under glazing units

3 mm – Standard Everyday Packing

One of the most commonly used thicknesses for general installations.

Best for:

• Typical window and door glazing
• Standard levelling and support
• General-purpose installations

5 mm – Larger Adjustments & Load Support

Provides stronger support where greater spacing or load handling is required.

Best for:

• Larger gaps
• Heavier sealed units
• Structural support and base packing