In the world of building envelopes, terms like house wrap and weather-resistant barrier (WRB) are often used interchangeably. But while both play a critical role in protecting a structure, they’re not always the same thing. Understanding the difference can help builders, architects, and contractors choose the right material for each project — and avoid costly mistakes down the road.
What Is a Weather-Resistant Barrier (WRB)?
A WRB is any material designed to prevent water from entering the building envelope while still allowing vapor to escape. It’s a broad category that includes products like house wraps, building papers, and coated sheathing.
In short, WRBs are the umbrella — house wraps are one type of WRB.
What Is House Wrap?
House wrap is a specific type of WRB. Typically made from nonwoven or woven polyethylene or polypropylene, house wraps are installed on the outside of sheathing to create a continuous barrier against water intrusion. They’re lightweight, easy to install, and deliver consistent vapor permeability.
House wraps like ALTA® 360 go a step further with added features such as drainable channels that quickly move bulk water away from the wall system.
Key Differences Between House Wrap and Other WRBs
- Material Type: WRBs can include asphalt felt, liquid-applied membranes, or rigid sheathing. House wrap is almost always a synthetic fabric.
- Ease of Installation: House wrap is lightweight, flexible, and designed for fast installation. Other WRBs can require more steps.
- Drainage: Not all WRBs offer drainage. Drainable house wraps like ALTA® 360 actively direct water away.
- Code Requirements: Depending on region and project specs, building codes may call for a WRB but not necessarily a specific type. House wrap often exceeds minimum requirements.
Why Builders Choose ALTA® 360
When deciding between WRB options, builders want confidence that their choice will last. ALTA® 360 offers:
- 360° Drainage Technology – installs in any direction, no guesswork.
- Durable Construction – tear resistance that stands up to tough jobsites.
- Options for Every Project – available in High-Permeability, Low-Permeability, and Commercial grades.
Conclusion
House wrap is a type of weather-resistant barrier — but not all WRBs are created equal. Choosing the right one can mean the difference between a dry, durable structure and a costly call-back.
👉 Download the ALTA® 360 spec sheet to learn which option is right for your next project.