Easily Design Air Tight Enclosures with Mechanically-Attached WRBs

Whether you’re building more energy-efficient structures or higher-performing buildings, air tightness is an essential factor. Tighter buildings must protect against air and moisture while allowing vapor to escape.

And while a self-adhered house wrap does not have the potential leakage a mechanical air and moisture barrier has, a well-designed and detailed system that includes a quality WRB can reach even the loftiest air tightness benchmarks.

One such system is DELTA®-VENT S, our mechanically-adhered air and moisture barrier that is made for energy-efficient, high-performance buildings.

Certified Passive House Consultant and experienced technical services manager Krzysztof Apriasz explains the innovative features of the air barrier, what makes it unique, and what DELTA® components can be used to ensure air tightness and moisture protection.

What are the layers of the WRB made of?

More and more buildings are being built with higher-performance membranes to increase air tightness. The highest-performing barriers are fully adhered sheets that have a superior material as well as foolproof installation.

DELTA®-VENT S is a heavy-duty, highly permeable water-resistive barrier and air barrier. It consists of a 3-layer, spun-bonded polypropylene that is suitable for all wall applications.

What’s the difference between a mechanically-attached and a self-adhered WRB?

The main distinction between mechanically-attached and self-adhered air barriers is the method of attachment. Mechanically-attached barriers are secured using fasteners, while self-adhered barriers use an adhesive backing for direct application. 

Mechanically-attached air barriers offer the advantages of a relatively straightforward installation process, a durable and effective air-sealing solution when correctly installed, and are well-suited for new construction and renovation projects. 

Self-adhered barriers, in comparison, offer a continuous and consistent bond through the adhesive, reducing the risk of air leakage, and can be quicker to install. 

However, the choice between these two types of WRBs often depends on factors specific to the building project, budget, climate conditions, and installer experience.

If you’re unsure which WRB to choose, we compare the two types in detail in a head-to-head matchup in our blog.