November 08, 2021

Can Pecora’s XL-Perm ULTRA VP be Applied in Rain Screen Applications?

The Pecora XL-Perm ULTRA VP air & vapor barrier may be successfully installed in rain screen applications. The rain screen design is generally defined by the separation of cladding from a structural wall in an effort to manage moisture and energy transfer through a wall assembly. System components typically include metal cladding with open joints, a ventilation/drainage cavity, framing system, insulation (rock wool or polystyrene) and an air barrier. As a result of the rain screen design and subsequent open joints, up to 40% of the underlying components including the air barrier are exposed to UV, wind driven rain, etc.

In order to achieve a successful and durable air barrier application the coating must be resistant to UV and the elements. The Pecora XL-Perm ULTRA VP air & water barrier coating’s unique STPU chemistry exhibits excellent UV resistance, weather-ability, washout resistance and color retention and is approved for use in rain screen applications.

The Pecora XL-Perm ULTRA VP is available in a black formulation specifically for rain screen applications. Custom colors are also available (minimum batch quantities will apply). Pecora’s standard material warranty will apply to all rain screen applications.

Application Guidelines:

  • All surface preparation requirements as noted in the Product Application Guidelines (which can be found here) must be met including sealing and flashing all seams, gaps and rough window openings with the Pecora XL-Flash Liquid Flashing and Joint Filler.
  • When utilized in rain screen applications, the Pecora XL-Perm ULTRA VP is applied at a minimum 30 wet mils in a single coat via an airless sprayer or roller.

To learn more about the XL-Perm ULTRA VP or our other fully engineered and compatible products that work together to provide air and vapor barrier protection for your building envelope, visit our website at


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