The Trex RainEscape Deck Drainage System Installation Guide (PDF) offers complete instructions for creating a dry, usable space beneath elevated decks. This guide shows how to properly install the RainEscape downspouts, troughs, flashing, and butyl tape needed to route water away from the deck and into a gutter system. When installed correctly, RainEscape protects the framing from moisture while allowing homeowners to add lighting, storage, and under-deck living areas.
The manual begins with planning and preparation steps, including joist blocking, proper fall direction, and safe handling of trough material. It explains how to install downspouts along ledger and rim joists, how far they should extend into gutters, and how to adjust them for 12″ or 16″ joist spacing. Installers will also find detailed steps for folding, acclimating, and stapling the trough material so water drains smoothly toward each downspout.
Instructions include multiple flashing methods—standard flashing, Z-flashing for brick or stucco, and alternative caulking options when flashing is not possible. The guide also covers taping seams with Trex RainEscape butyl tape, adding wall flashing foam strips, and attaching a gutter system to collect discharged water.
The second half of the guide addresses special scenarios such as picture-frame decks, cantilevers, obstructions around posts, double and triple beams, steel joist systems, and multi-level decks. Diagrams show how to handle downspout modifications, routing wires, installing soffit lights, and adding access panels to check gutters after installation.
The RainEscape system is designed for use with Trex decking and most elevated deck structures. Following the instructions ensures proper drainage performance, long-term durability, and full warranty coverage. Installers are reminded that all seams must be taped, troughs should face shiny side up, and the system should never be walked on or fastened with nails.
Download the full Trex RainEscape Installation Guide (PDF) below for diagrams, part lists, tools, special-case scenarios, and best practices. For help planning a RainEscape system or selecting compatible Trex products, contact your local TimberTown team—we’re here to support every stage of your deck project.
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