As architects continue to push the boundaries of building envelope performance, one enduring challenge remains: managing moisture in masonry wall assemblies and low-slope roof systems. Moisture intrusion—whether from wind-driven rain, condensation, or vapor migration—can lead to mold, premature material failure, and compromised structural integrity. Addressing this risk requires proactive solutions, and that’s where WickRight parapet and low-slope roof vents comes in.

WickRight, is a U.S.-based manufacturer of patented passive ventilation systems. Their parapet and low-slope roof vents effectively reduce moisture accumulation and promote continuous drying in masonry and low-slope roof assemblies, extending the life of building materials and the structural integrity of buildings, in addition to protecting occupant health.

The Persistent Problem of Moisture Intrusion

Even the most carefully designed building envelopes are susceptible to moisture. Water finds its way and condensation is produced naturally in masonry walls and interstitial roof spaces, where it’s absorbed by materials like trusses, plywood sheathing, and insulation. Left unmanaged, this moisture leads to rot, mold growth, and costly repairs.

Rotting truss system with foam insulation covered by 365 Construction Tent during truss replacement and WickRight Capstone Parapet Vent System and Roof Vent System installation. Photo provided by Level 13 Properties.

Conventional weep systems and roof vents provide insufficient relief. Moisture lingers in concealed areas, compromising structural components like embedded trusses and TJI joists, particularly in climates prone to frequent precipitation and high humidity.

Proven, Passive Ventilation Solutions

WickRight offers a suite of passive ventilation systems tailored for both new construction and retrofit applications. Their flagship products include:

• Parapet Vent®: Seamlessly integrated into capstone, clay, or metal copings, these vents introduce airflow into the masonry wall core, promoting continuous drying without disrupting architectural aesthetics. There are vents specifically designed for use under capstones, metal copings and clay copings.
• Low-Slope Roof Vent: Specifically designed to exhaust hot, moist air from interstitial spaces beneath low-slope roof membranes, this vent separates the roof membrane from wet masonry, eliminating perimeter condensation and preventing moisture migration into the roof assembly.

Manufactured from corrosion-resistant materials, WickRight systems are maintenance-free and designed to perform for the life of the structure.

Retrofit-Friendly and Architecturally Discreet

A key advantage of WickRight’s passive venting systems is their unobtrusive design and ease of integration, even in retrofit projects. Installers can add WickRight vents to existing masonry parapet assemblies with minimal disruption to facades and interiors.

With more than 150 documented installations in Chicago, the Midwest, Florida, and California, WickRight passive ventilation solutions have proven their effectiveness across diverse climates and construction types.

Data-Driven Performance Validation

To quantify their system’s impact, WickRight conducted field tests at five Chicago-area installations over a 12-month period. Weekly moisture meter readings consistently showed reduced moisture concentration at parapet and low-slope roof junctions—areas particularly vulnerable to moisture accumulation.

Even following prolonged wind-driven rain, buildings equipped with WickRight Parapet Vent® and Roof Vent maintained predictable drying rates, confirming reliable moisture management in challenging conditions.

Computational Fluid Dynamics (CFD) Analysis

Further validating their products, WickRight partnered with SimuTech Group, a third-party engineering firm, to perform Computational Fluid Dynamics (CFD) analysis on a single-wythe CMU wall model fitted with WickRight Metal Coping Vent. Simulations under a 80º F, 18-mph wind scenario revealed:

-7.2 CFM of draw per linear foot of WickRight Metal Coping parapet vent

Watch the video here

Another simulation, same conditions revealed:

Approx. 7.87 lbs of lift force per 33 ft length of vent per minute is created facilitating rapid moisture vapor evacuation

These CFD findings offer architects data-driven insight to inform detailing decisions and support the long-term benefits of integrating passive ventilation. There are multiple simulations available for review.

Why Low-Slope Roof Condensation Persists and How to Prevent It

Low-slope roofs are particularly susceptible to condensation, especially at the junction where thin roof membranes meet dense masonry parapets. The differing thermal mass between these materials produces condensation at the perimeter, where wood structural components absorb water and can start to deteriorate.

The WickRight Low-Slope Roof Vent addresses this by:

Separating the masonry parapet from the roof membrane, eliminating condensation hotspots.

Exhausting hot, moist air from the interstitial roof field.

Drying saturated masonry to prevent moisture from migrating into structural components like trusses and TJI joists—a common issue in Chicago and other markets where wood structural components are routinely embedded in masonry walls.

Why Passive Ventilation Should Be Standard in Building Design

As building science increasingly prioritizes moisture management and healthy indoor environments, passive ventilation is becoming a crucial element in sustainable, high-performance building envelopes. WickRight patented systems offer a permanent, no-maintenance solution to one of construction’s most persistent challenges.

Learn more about WickRight products, CFD data, and BIM object families for your next project at WickRight.com.

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**This article was not written by ALA and is written by WickRight.