Image of Del-Val 110 Fibered Roof Coating in 5 Gallon Pail

Del-Val 321

High Solids Silicone Roof Coating

Withstands Ponding Water with low VOC. Less Dirt Pickup Than Standard Silicones!


Del-Val 321 High Solids Silicone Roof Coating is a high yield, low VOC one-part silicone elastomeric roof coating. Del-Val 321 High Solids Silicone Roof Coating, when compared mil for mil, provides greater UV protection than similar silicone coatings and offers increased resistance to moisture penetration. Del-Val 321 provides excellent long term protection through exceptional weather-ability properties.

Our newest silicone roof coating boasts less dirt pickup than standard silicones meaning more sustained reflectivity & good looks!

Where to Use Del-Val 321 High Solids Silicone Roof Coating

Available Colors

White (321-W)


Del-Val 321 was specifically designed as a protective coating over a variety of roofing substrates. Once cured, this liquid applied silicone coating provides a durable, seamless, flexible, waterproof membrane that resists lateral movement, shear and will allow for normal expansion and contraction.


Surface must be clean, free of all loose particles, dirt debris and other contaminants that could inhibit adhesion. Adhesion tests are recommended to ensure the coating is going to adhere to the substrate, contact United Asphalt if needed.


Del-Val 321 High Solids Silicone Roof Coating may be applied by medium nap rollers, soft brushes or high pressure airless spray equipment. Apply Del-Val 321 only to clean, dry, sound surfaces free of loose particles or other foreign matter. For best results, ambient temperature should be between 50-90°F. Higher temperatures will shorten the cure and working times for proper application of granules before the material has skinned. Lower temperatures will lengthen the skinover, tack free and ultimate cure time. Sudden temperature declines may also result in dew formation on surfaces, which can prevent adhesion development. For best results, relative humidity should be above 20%. Lower humidity will slow the cure time significantly.

Coverage Rates

Apply Del-Val 321 at the rate of 1.5 gallons per square. Minimum dry mil thicknessshall be above 20 mils. Two passes of silicone and a primer coat may be required forsome applications.

Limitations & Precautions

AVOID CONTAMINATION IN SEALED CONTAINERS. STORE AWAY FROM HEAT, SOURCES OF IGNITION AND INCOMPATIBLES. USE ONLY IN WELL VENTILATED AREAS. Do not inhale vapor or mist. Do not get on skin, in eyes or on clothing. Refer to SDS for more information.

Depend on Del-Val Logo

Frequently Asked Questions (FAQ)

What is the coverage rate?

The basic guidance for coverage is about 1-1/2 to 2 gallons per square (per coat). To make it easier to determine how much you will need for your job, we've put together a calculator tool.

What is the lowest temperature I can apply Del-Val 321 High Solids Silicone Roof Coating?

The lowest temperature Del-Val 305 should be applied is 50°F.

Don’t Forget to Pick Up The Following For Repairs!

Del-Val 241 Silicone Roof Patch Stacked Pyramid of 2 Gallon Plastic Buckets

Del-Val 241

Silicone Roof Patch

Product Information

Sizes Available

5 Gallon Capacity Pail
55 Gallon Capacity Drum

Tools Needed

Brush Tool Graphic
Roller Tool Graphic
Spray Tool Graphic


How Much Will You Need?

With an Estimate of How Much You May Need, Buy it Locally…

*This calculator is provided as a guide. Do to variables of each project, we can not guarantee the calculated result is what will actually be needed for your specific project.

Available From These Distributors

Click a logo to find a location close to you.

Have Additional Questions About Del-Val 321 High Solids Silicone Roof Coating?
Image of Del-Val 110 Fibered Roof Coating in 5 Gallon Pail
Have a product specialist reach out to answer any questions you may have.

Please fill out the below form completely and we’ll be happy to get in touch with you!

New Inquiry for Del-Val 321 High Solids Silicone Roof Coating

Which Best Describes You?