Building Envelope & Waterproofing Systems

Rainier Building Supply provides weather-resistive barrier systems and exterior waterproofing components for residential, multifamily, and commercial projects across the Pacific Northwest. We work with trusted manufacturers to supply WRB, air barrier, insulation, and drainage products that support durable, code-compliant exterior assemblies.Our WRB offerings are selected to integrate properly with siding and cladding systems, flashing, fasteners, and custom sheet metal to support long-term moisture, air, and thermal performance.

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

Our WRB Portfolio

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 WRB and waterproofing 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 consultation to help ensure materials and detailing are correct for each project.

Coordinated Exterior Systems

WRB performance depends on proper coordination with the full exterior assembly. Rainier Building Supply helps align:

  • WRB and air barrier systems
  • Exterior insulation and substrates
  • Integrated sheathing systems
  • Rainscreen and drainage components
  • Flashing tapes and membranes
  • Fasteners and sealants
  • Custom sheet metal flashing and trim

Our in-house Sheet Metal (Custom Fabrication) operation produces job-specific flashing components critical to proper water management and long-term durability.

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

Trusted by Our Clients

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