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Sealants & Caulking

Sealants for Exterior & Envelope Systems

Rainier Building Supply offers sealants and caulking products used in exterior construction, siding installation, and building envelope assemblies for residential, multifamily, and commercial projects across the Pacific Northwest. We work with trusted manufacturers to supply products designed for durability, compatibility, and real jobsite conditions.Our sealant offerings support proper integration between siding, WRB, flashing, fasteners, and custom sheet metal to help ensure long-term performance and weather protection.

Sealant & Caulking Products We Supply

We supply a range of sealants and related products used throughout exterior assemblies, including:

  • High-performance exterior sealants
  • Joint and transition sealants
  • Sealants for siding, trim, and panel systems
  • Air and water sealing products
  • Adhesives and bonding agents
  • Specialty sealants for envelope applications
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Key Manufacturers

We supply sealants and caulking products from leading manufacturers known for performance, testing, and system compatibility, including:

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

Sealant & Waterproofing Support

We provide practical support with sealant selection and system compatibility based on real job conditions. Our team can assist with identifying the correct sealant for specific substrates, transitions, and exterior details to help ensure proper performance and longevity.

Coordinated Exterior Systems

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

  • Sealants and adhesives
  • Siding and cladding systems
  • Weather-resistive barriers (WRB)
  • Flashing tapes and membranes
  • Fasteners and accessories
  • Custom sheet metal flashing and trim

Our in-house Sheet Metal (Custom Fabrication) operation produces job-specific flashing components that work together with sealants to support effective water management.

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

Get Sealant Pricing or Support

Our team is available to assist with pricing, availability, and product selection.

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