Liquid-applied weather-resistive barriers (WRBs) offer continuous, monolithic protection across exterior walls. This article outlines best practices for application, substrate preparation, curing requirements, and compatibility with adjacent materials.
Advantages of Liquid WRBs
- Seamless coverage over sheathing and joints
- Excellent air and water resistance when cured
- Fewer mechanical fasteners and overlaps vs. sheet membranes
- Compatible with complex geometries and penetrations
Application Requirements
- Substrates must be clean, dry, and structurally sound
- Apply with roller, trowel, or sprayer at 20–40 mils thickness
- Embed mesh at joints or seams as required by manufacturer
- Do not apply in temperatures below 40°F unless product is cold-weather rated
Curing and Inspection
- Dry time ranges from 2–16 hours depending on product and conditions
- Perform visual inspection for consistent thickness and coverage
- Use wet mil gauge during application to verify proper thickness
- Photograph key transitions before cladding or insulation install
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