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Building Envelope & Waterproofing Systems

Envelope & Waterproofing Systems

Rainier Building Supply supplies weather-resistive barriers, roofing underlayment, air barriers, flashing systems, and drainage components that help protect the full exterior assembly. We work with contractors, builders, and project teams to coordinate wall and roof barrier products that perform together for long-term moisture control, durability, and code compliance.

WRB & Envelope Products We Supply

We supply a range of weather-resistive barrier and exterior envelope products, including:

  • Housewraps and WRBs
  • Self-adhered flashing tapes and membranes
  • Fluid-applied and sheet air barriers
  • Exterior and continuous insulation
  • Gypsum sheathing and substrate boards
  • Integrated sheathing systems
  • Rainscreen and drainage systems
  • Wood and plywood furring strips
  • Rainscreen mesh and ventilation products
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Our WRB Portfolio

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Key Manufacturers

We supply WRB and exterior envelope products from leading manufacturers known for testing, system compatibility, and long-term performance, including:

If a specified product or system is not part of our standard offering, we work to source it quickly and cost-effectively through our supplier network.

WRB & Waterproofing Support

We provide practical support based on real job conditions, including product selection, system compatibility, and flashing coordination. When needed, our team can assist with field measurements, on-site evaluation, and in-shop material coordination to make sure details are correct for each project.

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Why Rainier

Family-owned
and locally operated

10+ years
in business
50+ years of combined
industry experience
Focused on the
building envelope

Reliable service and
clear communication
Custom Sheet
Metal Expertise

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Trusted by Our Clients

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Our team is available to assist with pricing, availability, and system coordination.

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