Silicone sealant application temperature: what should you watch out for?

Planning to caulk doors and windows or other components of your building’s envelope, but hesitating to start the work because of the weather forecast?

In this article, find out how the outside temperature can influence the adhesion and effectiveness of a silicone sealant. This will help you to achieve aesthetic and long-lasting seals.

The influence of temperature when applying silicone sealant

If you want to apply a silicone door and window caulking, you can do so regardless of the outside temperature. In fact, these sealants can be applied even when the temperature drops below freezing. For example, Adseal 4580 silicone sealant can be applied at temperatures as low as -29°C (-20°F). However, keep in mind that the colder the temperature, the longer the sealant will take to cure.

That said, organic sealants such as polyurethanes should not be applied during periods of extreme cold.

Beware of large temperature fluctuations

When there is a large temperature change that brings the temperature below freezing in a short period of time, the substrates can react by expanding or compressing.  If the silicone sealant that was applied was not allowed enough time to form a thick enough skin, this can in some cases cause a break or crease in the joint, reducing its effectiveness.

It is also recommended to avoid applying a hot sealant on a cold surface. Use your best judgment.

Water is the real threat to your sealant joints

Sealing joints on a damp surface should be strongly avoided, since silicone sealants generally do not adhere as well to moist substrates. If you want durable joints, never apply sealant in rain, freezing rain, snow or heavy fog. Always make sure the surface is frost-free before you start applying your sealant with a caulking gun.

Get a high-quality adhesive sealant for successful joints

In conclusion, if you choose a silicone sealant to caulk exterior building components, you can caulk at temperatures as low as -29°C (-20°F). However, you will have to make sure that there is no precipitation or humidity that could interfere with the adhesion of the sealant.

Naturally, for the best results, always use high-quality sealants such as the Adfast Adseal line. These products are designed for professional use and are widely used in a diverse range of industries. For more information about these products, please contact the experts at Adfast.