Compare two primary air barrier strategies for high-performance building envelopes. Learn which is best for your wall assembly, including recommended products and applications.
Overview
Controlling air leakage in building envelopes is critical for energy efficiency, indoor air quality, and moisture protection. Two of the most common air barrier membrane types are self-adhered sheets and liquid-applied coatings. This article compares the advantages, challenges, and best use cases for each type in commercial construction.
Self-Adhered Membranes
- Pre-manufactured sheets with adhesive backing
- Easy visual inspection of coverage and defects
- Good compatibility with CMU, sheathing, and metal substrates
- May require primer on dusty or cold surfaces
Liquid-Applied Membranes
- Applied by roller or sprayer
- Excellent for uneven substrates and complex geometries
- No seams or laps to detail
- Longer curing time and weather sensitivity during application
Used In These Assemblies
- Steel-stud commercial exterior walls
- Masonry cavity wall assemblies
- Panelized construction with integrated air/water control
❓ FAQ
Which is easier to install?
Self-adhered is generally faster on large open walls, while liquid-applied is ideal for detailed or irregular surfaces.
Do both types need primer?
Yes. Surface prep is critical, and primers are often required for proper adhesion and long-term performance.Conclusion
Both self-adhered and liquid-applied air barriers can deliver excellent results when installed properly. The choice depends on substrate, detailing, climate, and project schedule. Use tested products, follow manufacturer guidelines, and verify continuity at all transitions.
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