Building Envelope Expansion Joints 

Key Takeaways: 

  • Expansion joints in the building envelope must remain flexible and weather-resistant to handle movement and prevent leaks.
  • Using a high-performance façade sealant ensures long-term protection against moisture, air, and dirt ingress.
  • Gorilla MS, Soudaseal FR, and Soudaflex Façade 20LM deliver exceptional elasticity, adhesion, and durability for both residential and commercial façades.
  • Pairing sealants with Soudal Foam provides added insulation and structural stability. 

Building Envelope Expansion Joints 

When sealing expansion joints across a building envelope, flexibility and adhesion are key. Joints around windows, between façade panels, or at transitions between materials experience continuous stress from temperature changes, wind, and structural movement. Without a high-quality sealant, this movement can lead to cracking, air leakage, and moisture ingress, all of which compromise the building’s performance and energy efficiency. 

Gorilla MS provides strong elasticity and weather resistance, ideal for exterior applications exposed to movement and environmental stress. For projects where fire resistance is required, Soudaseal FR offers a certified fire-rated solution without compromising flexibility. Meanwhile, Soudaflex Façade 20LM is a professional-grade polyurethane sealant designed specifically for façade joints, providing excellent adhesion to concrete, aluminium, and PVC window frames. 

Behind the sealant, Soudal Foam can be used to fill cavities or gaps, providing thermal and acoustic insulation between moving structural elements. Together, these products ensure a continuous, weatherproof seal that maintains the integrity of the building envelope over time. 

FAQs

Why are expansion joints important in façades?

They allow the building to move naturally without causing cracks or damage to the sealant or structure, along with ensuring continued weather-tightness.

Can Gorilla MS be used on painted or coated surfaces?

Yes, it adheres well to a wide range of materials including painted, coated, or powder-coated aluminium.

Is Soudaseal FR suitable for all façades?

It’s ideal for use where a fire-resistant joint is needed, such as multi-storey or commercial buildings.

Can I use Soudal Foam with these sealants?

Absolutely, applying foam behind the sealant improves insulation and creates a more durable, energy-efficient joint system.