Find a contractor Buyer's guide Partner with us
MCAA Logo
Log in Sign up Join Hi, there Account
2026 Midyear Registration is OPEN
Find a contractor Buyer's guide Partner
Log in Sign up Join Account

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.
 0
Installation Starts Before the First Course
August 2026

Some of the most expensive masonry installation problems begin long before crews arrive onsite. By the time a project reaches the field, many coordination decisions have already been made. Dimensional conflicts, congested reinforcement, specialty materia

Technical Talks
Read More
Designing for Performance: Key Considerations for Efficient, Durable Masonry Projects
August 2026

A successful masonry project starts well before the first stone is set. The craftsmanship on site matters, of course, but many of the decisions that shape the final result are made much earlier—during design, detailing, and material selection. Those choic

Jeff Tew
MAP Partner
Manufactured Stone MAP Partner Stone (Exterior) Stone (Interior)
Read More
Change Orders: Standard Operating Procedure
August 2026

In masonry construction, change orders are not occasional events; they are guaranteed. Drawings do not always match field conditions, specifications can conflict, and real-world construction has a way of exposing gaps in design. At DRP Masonry, we operat

Donnie Williams
Resources
Read More
RFIs: Clarity, Communication and... Hierarchy?
August 2026

In construction, any project starts with drawings. Plans. Schedules. Specifications. Whether we're talking about new construction, additions, or restoration, there is a plan, there is design intent, and a way every piece of a project needs to fit together

Kate Vienna
Technical Talks
Read More