The outdoors present all kinds of construction challenges. Whether you live in a warm, dry climate, a cool, wet region, or anywhere in between, you’ve undoubtedly run into weather-related trouble at some point.

The secret to better durability lies in outdoor silicone sealant, a high-quality material designed to withstand the pressures that surfaces are exposed to in outdoor settings. Here’s what to know about exterior silicone sealant and how you can find the right product.

How Does Outdoor Silicone Sealant Work?

Outdoor silicone sealant differs from regular sealant in several ways. This versatile adhesive creates waterproof seals on window frames, doorways, and plumbing fixtures. Its silicone chemical structure makes it resistant to ultraviolet light and temperature extremes.

When applied, the sealant forms a (virtually) impermeable barrier that prevents water from seeping through the cracks and joints, protecting structures from water damage. It’s also highly flexible, meaning it can accommodate movement without degrading.

Some outdoor sealants even contain fungicides that inhibit mold growth. Nasty spores, be gone!

What are the Benefits of Exterior Silicone Sealant Compared to Regular Sealant?

While traditional silicone sealant has been praised the world over for its remarkable adhesive qualities, it doesn’t hold a candle to outdoor sealant in terms of weather resistance and durability.

Here’s why you should invest in exterior silicone sealant for your next outdoor project.

Better UV Resistance

Outdoor construction is one area where the sun is NOT our friend. Unlike traditional silicone sealants, which can degrade when exposed to harsh UV rays, exterior silicone sealant demonstrates incredible resistance to UV light.

This is because the sealant is formulated with UV inhibitors that protect it from sun damage. The result? A highly durable material that stands the test of time.

Superior Temperature Tolerance

It should come as no surprise that a sealant marketed as an outdoor product features impressive temperature tolerance. Outdoor sealant can handle it all, from freezing cold to scorching heat.

Silicone Depot’s Hi-Temp Red & Blue 100% RTV Sealant is a great example of a product that can hold up even in high temperatures. Our high-temperature sealant rates at 650 degrees Fahrenheit for intermittent exposure and 550 degrees continuously.

Improved Moisture Resistance

Outdoor silicone sealant contains stronger waterproof qualities. Applications exposed to rain, snow, or humidity can benefit from an adhesive designed to prevent water penetration.

While most silicone sealants are waterproof to an extent, exterior sealants are designed with enhanced hydrophobic properties that repel water more effectively, thereby stopping moisture ingress that can lead to mold and structural damage.

Top-Notch Adhesion

Outdoor silicone sealants are formulated to provide excellent adhesion to a wide range of materials commonly used in exterior applications, including metal and glass. Such versatility creates a strong bond that can withstand the rigors of outdoor exposure.

What are the Best Outdoor Sealants?

Your choice of sealant can make or break your project, which is why it’s important to choose carefully. There are a number of factors to consider when deciding between products.

High Modulus Silicone Sealant

High modulus sealants are characterized by their high strength and rigidity when cured. These sealants are especially effective for heavy-duty applications where a strong bond is essential — think structural glazing or projects involving heavy panel installation.

One of the key benefits of high modulus sealant is that it can withstand significant force and weight. This makes it ideal for areas subject to heavy winds or mechanical stress. Even so, it retains some flexibility and allows for movement, which is crucial for outdoor applications.

Low Modulus Silicone Sealant

While this choice may seem contradictory, low modulus sealants offer greater elasticity compared to high modulus products, which is perfect for sealing joints that experience significant movement or expansion.

This type is favored for perimeter sealing around windows and doors, as it can absorb the expansion and contraction caused by temperature fluctuations without cracking or losing adhesion.

Neutral Cure Silicone Sealant

Neutral cure sealants are known for their non-acidic curing process, which makes them compatible with a wider range of outdoor materials. Best of all, they emit little to no odor during curing — great for confined spaces.

They are also less likely to cause staining on natural stones or other sensitive materials. For this reason, they are particularly suitable for sealing facades, stone cladding, and other decorative elements.

Our Neutral Cure 100% RTV Silicone Sealant is a professional-grade product that can adhere to surfaces like concrete and limestone. It can resist high temperatures and UV rays, and emits low to no odor.

Multipurpose Outdoor Silicone Sealant

All-purpose silicone sealant offers great waterproofing qualities and remains effective in sealing gaps over long periods of time. It’s resistant to extreme temperatures, UV light exposure, and more.

Protect Your Outdoor Surfaces With a High-Quality Sealant

Don’t let the rain get you down. With a good outdoor sealant, you can ensure your projects hold up long-term and retain functionality, even in the harshest conditions.

Silicone Depot offers many silicone sealants ideal for outdoor applications. Need help deciding? Give us a call at 812-824-8000.