XL-Perm Air, Vapor and Water Barrier System

Words: Dan KamysPecora’s XL-Perm Air, Vapor and Water Barrier System consists of products that work together to provide complete protection for a building envelope.

The four-step solution promotes continuity of weatherproofing barrier systems.

Step 1: Pecora XL-Flash STPU Fast Curing Liquid Flashing and Joint Filler
A 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 elastomeric weatherproofing membrane provides two- to three-times the coverage of other fluid applied products. XL- Perm ULTRA VP has elasticity and crack-bridging capabilities contributing to a seamless, durable and airtight building envelope. It also can be used on damp substrates and green concrete.

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

Step 4: Pecora XL-Span 100% Silicone Extruded Transition Membrane
Airtight and watertight barrier at transitions between building façade components.

All the products in the Pecora XL Perm system, when used together according to manufacturer's guidelines, achieve 100 percent compatibility, wet or dry. Complete system testing was done using an assortment of air, vapor and water barrier materials to ensure quality. Now available, Pecora XL-Perm is a professional system that must be used in conformity with manufacturer's instructions.

For more information, visit pecora.com.
About: Featured
 0
Masonry Mortar: The Right Type for the Job
May 2025

When it comes to masonry construction, mortar is much more than “glue” that holds everything together — it’s a critical component of wall performance, longevity, and aesthetics. It can “make it or break it”. Whether you’re laying a foundation CMU wall or

Garen Graves
Featured MAP Partner
Mortar
Read More
MASONRY STRONG Podcast, Episode 20 Recap: Mark Kemp, Superior Masonry
May 2025

Justin Stengel
Read More
How It’s Made: Clay Thin Brick
May 2025

Clay thin brick is a versatile alternative to traditional full brick. It comes in numerous colors and styles and offers something for every design preference. Thanks to the lighter weight, it is designed to reach spaces full brick cannot. From floors to c

Allison Goley
Featured MAP Partner
Read More
Bonding with Masonry 2025: Q1
May 2025

This issue’s questions come from an Architect and a Mason Contractor. What questions do you have? Send them to info@masonrymagazine.com, attention Technical Talk. Q. An Architect asks how to create a narrow masonry pier between openings. Is there a min

David Biggs
Featured
Read More