TREX RainEscape® Butyl Caulk: Industrial-Grade Waterproof Sealant

TREX RainEscape Butyl Caulk is an essential component of the RainEscape under-deck drainage system, designed to create water-tight seals between troughs, downspouts, and joists. This high-performance caulk delivers long-lasting moisture protection and helps you maintain a dry, usable space beneath your elevated deck.

Key Benefits

• Creates a Seamless Waterproof Seal:
  Prevents leaks at critical joints in the RainEscape system.
  
  
• Protects Deck Framing:
  Shields your joists, fasteners, and substructure from long-term water damage.
  
  
• Improves Fastener Performance:
  Helps screws grip better and last longer by reducing moisture exposure.
  
  
• Versatile Compatibility:
  Can be used with any decking material and all common joist types (wood or composite).

Easy to Apply

This butyl-based caulk is simple to apply and ideal for DIYers or contractors alike. With a smooth, easy-to-control consistency, TREX RainEscape Butyl Caulk allows for clean seams and confident installations — no professional experience required.

Durable, All-Weather Performance

• UV-Resistant:
  Holds up under prolonged sun exposure without cracking or peeling.
  
  
• Weatherproof:
  Stands up to rain, snow, temperature swings, and high humidity.
  
  
• Long-Lasting Protection:
  Minimizes the risk of moisture intrusion and maintenance headaches.

Recommended Use

• Seal trough seams, around downspout connections, and between joists in the TREX RainEscape system
  
  
• Use in conjunction with:
  • TREX RainEscape Troughs
  • TREX RainEscape Down Spouts
  • TREX RainEscape Wall Flash

Why Choose TREX RainEscape Butyl Caulk?

When building a dry space under your second-story deck, dependable waterproof sealing is critical. TREX RainEscape Butyl Caulk delivers performance you can trust — protecting your deck structure while supporting the creation of a usable area below for storage or outdoor living.

Installation Help

• Installation help

Questions about how to use this product? Contact us or visit a Deck Store showroom for expert guidance.