Air, Vapor & Water Barrier Products


ABAA _evaluatedPecora XL-PERM: Air, Vapor & Water Resistive Barrier System

Easy Four Step Solution for an Energy Efficient Wall System

Fully engineered and compatible products that work in tandem to provide complete air, vapor and water barrier protection for your building envelope.

Assured Continuity of Air, Vapor and Water Resistive Barrier Systems
Products can be used together as a system or independently as needed. 

Step 1: Pecora XL-Flash STPU Fast Curing Liquid Flashing /Joint Filler – A unique one part, fast curing, non-sag elastomeric STPU gun grade, trowelable liquid flashing and joint sealant specially formulated for the air and vapor barrier industry.

Step 2: Pecora XL-Perm ULTRA VP Fluid Applied STPU – Applied in a single coat via airless sprayer or roller, this durable elastomeric weatherproofing membrane provides two to three times the coverage of other fluid applied products. XL- Perm ULTRA VP has excellent elasticity and crack bridging capabilities contributing to a seamless, durable, and airtight building envelope. It can also be used on damp substrates and green concrete.

Meets performance requirements of NFPA 285 

Step 3: Pecora AVB Silicone Sealant/Adhesive – Designed as an integral component for transition seals between dissimilar materials in air, vapor and water resistive barrier systems, offering superior green strength.

Step 4: Pecora XL-Span 100% Silicone Extruded Transition Membrane – Air and water tight barrier at transitions between building façade components.


Application Manual – English | Spanish

Application Details

Guide Specification  

UL Certification



Products Description  
Pecora AVB Silicone

One-part, Primerless Silicone Sealant for Air-Vapor Barrier Surface Transitions

Color Chart

STPU Liquid Applied Flashing and Joint Filler

Color Chart
XL-Perm Ultra VP

Fluid Applied, Permeable STPU Air, Vapor and Water Barrier

Color Chart

100% Pre-formed Silicone Transition Membrane

Color Chart
Tech Bulletin

Pecora's goal is to provide our customers with comprehensive solutions - not just products. Pecora's experienced technical services representatives and sales representatives are available to answer your questions concerning sealant selection, requirements and recommendations on a per job basis. We also offer complete technical support.

Distributor/Sales Rep Locator

Sales Rep

Technical Services

Let our tech service experts help make your project a success.

Click or call (800) 523-6688.

Pecora Calculator

Calculate material needs for Coatings, Sealants and Air Barriers.

Launch Calculator

Pecora Calculator
Air Barrier
Enter Data:
Select Product

Required Dry Mil Coverage (mils)

Total Sq. Ft. Of Project

Estimated Waste (%):
Coverage Rate(Wet):
Sq. Ft./Gallon


Materials Required

To use: Enter values and press "Update" to recalculate. These calculators also update when you tab to the next field or click elsewhere in the page.