Silicon vs Rubber (gaskets)

Silicon Re-seal by Adelaide Glaziers

Both silicon sealant and rubber gaskets (or wedges) are used to seal window glass, but they have some distinct differences in terms of their application, performance, and aesthetics.

Silicon Sealant:

1. Application:

  • Versatility: Silicon can be used to seal gaps and joints of various sizes.
  • Skill Required: Applying silicon requires a steady hand and attention to detail to ensure a neat finish.

2. Performance:

  • Durability: High-quality silicon sealants can last for many years and offer excellent resistance to weathering.
  • Flexibility: Silicon remains flexible over time, which can be beneficial in accommodating minor shifts in the building structure.
  • Maintenance: Over time, silicon may discolor or peel and might require reapplication.

3. Aesthetics:

  • Finish: If not applied carefully, silicon can be messy and may affect the clean lines of the window.

Rubber Gasket (Rubber Wedge):

1. Application:

  • Ease of Use: Gaskets are usually pre-formed to fit and are generally easy to install.
  • Limitations: Gaskets may not be suitable for irregular or non-standard window shapes.

2. Performance:

  • Durability: Rubber gaskets can degrade over time due to exposure to the elements.
  • Sealing Ability: They provide an effective seal against water and air infiltration.
  • Maintenance: Replacing a gasket can be simpler than reapplying silicon, but it still requires some effort.

3. Aesthetics:

  • Finish: Gaskets provide a clean, consistent look as they are usually designed to fit precisely.


  • Cost: Silicon sealants might be less expensive than custom rubber gaskets.
  • Weather Resistance: Both materials offer good weather resistance, but silicon might have an edge in terms of longevity.
  • Ease of Replacement: Gaskets may be easier to replace as they don’t require the careful application that silicon does.
  • Aesthetics: This can be subjective, but gaskets may offer a more uniform appearance compared to silicon, which may be messier if not applied meticulously.

Ultimately, the choice between silicon sealant and a rubber gasket may depend on the specific application, budget, aesthetic preferences, and the level of maintenance the homeowner is willing to undertake.


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