Commercial Roofing, Agricultural and Contractor Applications

PRC 350 – Pella Silicone Coating for Commercial Roofs

A high solid, low VOC, Pella Silicone Coating for Commercial Roofs is a one-part silicone elastomeric coating specifically designed for use in roofing applications 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 and shear movement, and will allow thermal expansion and contraction. Silicone is used in a wide variety of building applications because of its strong performance characteristics: UV resistance, temperature resistance, higher stress tolerance due to movement, and continued flexibility over time.

PRC300 – Pella Silicone Sealant for Commercial Roofs Silicone repair

Stop leaks! Quick patch and repair of leaks, even underwater. Use on gutters, flashing, etc. (need more here). was specifically developed as a protective sealant for pipe boots, seams, flashing areas, curbs, exposed fasteners, and all other breaches in a roof system that will allow water to enter a structure. With excellent adhesion to other silicone products, Pella Roof Coating’s Silicone Sealant is proven to provide long-term durability versus water-based sealants.

For repairs under water, you need Pella Silicone Super Seal – Patch, seal, and repair leaks, even underwater!

Silicone Sealant for Commercial Roofs Gallery

Key Benefits of Silicone Coating for Commercial Roofs

  • High Solids
  • One-coat application
  • Lasting strength and flexibility
  • Excellent flow and leveling
  • Requires no mixing
  • Can be applied by spray, roller or brush
  • VOC compliant
  • Can be recoated
  • Withstands ponding water

Types of Applications for Commerical Silicone Coating

  • Fasteners, flashings and gutters
  • Metal buildings and roofs
  •  Modified bitumen and built-up roofs
  •  Polyurethane foam and concrete surfaces or roofs
  • Single-ply roofs
  • Industrial roofs
  • PVC roofs

Benefits of Silicone Sealant

  • One-coat application
  • Lasting strength and flexibility
  • Can be applied by trowel or brush
  • VOC compliant

Applications for Silicone Sealant

  • Metal buildings and roofs
  • Fastners, flashings and gutters
  •  Modified bitumen and built-up roofs
  • EPDM, Hypalon and TPO roofs
  •  Polyurethane foam and concrete surfaces or roofs


PRC 350 may be applied by medium nap rollers or soft brushes. Apply PRC 350 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 time and working time for proper application of granules before the material has skinned. Lower temperatures will lengthen the skin over, 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.

Apply PRC 350 at the rate of 1.25 gallons per 100 sq. ft. Minimum dry mil thickness shall be above 20 mils. Two passes of silicone and a primer coat may be required for some applications and warranty programs.



Avoid contamination in sealed containers. Store away from heat and sources of ignition. Do not inhale vapor or mist; do not get on skin, in eyes, or on clothing. Refer to SDS for more information.