How to Install Trex Rainescape on Existing Deck

Installing Trex Rainescape on your existing deck is a great way to keep water from pooling up and dampening your outdoor living space. This easy DIY project can help protect the structural integrity of your raised deck as well as boost its aesthetic appeal without breaking the bank.

How to Install Trex Rainescape on Existing Deck

Whether you’ve just constructed an elevated platform or have had a deck installed for years, installing Trex Rainescape drainage material can significantly increase the longevity of both materials and provide improved safety measures against weather-related incidents.

Read on to learn more about this straightforward solution that won’t require any technical about how to install trex rainescape on existing deck!

Can You Install Trex Rainescape on an Existing Deck?

Yes, you can install Trex Rainescape on an existing deck. This helpful system, which helps divert water away from your deck and off of your house, is a great addition to any home. To get started with the installation process, you will need to gather the necessary materials and tools for the job.

The first step is to remove any existing decking and railing. This will give you plenty of space to work. Once the deck has been completely cleared, you can begin laying down the Trex Rainescape components. Start by placing the membrane sheet across the entire deck surface and stapling it in place. Next, install the edge trim along each side of the deck to provide a neat, finished look.

To complete the installation of Trex Rainescape, install the drainage system. This includes the downspouts, which are placed at each corner of your deck and divert water away from your home, as well as any necessary gutters and elbow pieces that run along the sides of your deck. Once the system is in place, you can add the Trex RainEscape Deck Drainage System components, such as the collector boxes and gutter guards.

Installation of Trex Rainescape

How Do You Waterproof an Existing Deck?

Once you’ve decided to install Trex RainEscape for waterproofing on an existing deck, there are a few steps you should take to proper installation. First, prepare the surface of your deck by cleaning it thoroughly and inspecting it for any signs of damage or decay. Then, check that your joists are securely nailed into the frame of your deck and there are no gaps between the joists and supports.

After preparing your deck surface, you’ll need to attach the Trex RainEscape membrane to the deck frame. Start by chalking a line parallel to the house in order to ensure that the membrane is straight and even when it is attached. Then, unroll the membrane and cut off any excess material before stapling it to the deck frame along the chalked line.

To ensure a proper seal, use construction adhesive around the perimeter of your deck and between each joist as you attach the membrane. Pay special attention to areas around posts, stair risers, and ledgers. Finally, use flashing tape to seal the seams of your membrane and cover any staples with a generous amount of caulk.

10 Methods How to Install Trex Rainescape on Existing Deck

1. Assess Deck Suitability

Before installing Trex RainEscape on your existing deck, assess the deck’s suitability for the system. Ensure that the deck structure is sound and capable of supporting the added weight of the RainEscape components. Check for any signs of damage or decay, and make any necessary repairs before proceeding with the installation.

Trex Rainescape on Your Existing Deck

If you have any doubts about the deck’s integrity, consult a professional for inspection and advice. To ensure proper installation and use of Trex RainEscape, the deck must also meet certain specifications. It should be at least 12 inches from grade and have a slope of 1/8 inch per foot.

2. Gather Materials and Tools

Compile all the necessary materials and tools for the installation process. This typically includes Trex RainEscape troughs, downspouts, tape, flashing, screws, and a utility knife. Additionally, you’ll need a drill, tape measure, level, caulking gun, and a hammer. Most of these items can be found at any local hardware store.

If any of the materials are missing or damaged, you’ll need to get replacements before continuing. To be sure you have everything, check the instruction manual that came with your Trex RainEscape kit. Try to have all of your materials and tools in one place before you begin to make the installation process easier.

3. Plan the Layout

Develop a detailed plan for the layout of the RainEscape system on your deck. Consider the deck’s dimensions, water flow patterns, and any obstacles, such as posts or stairs. 

Measure the deck accurately and create a layout plan that ensures optimal water drainage and protection.

If needed, purchase additional Trex RainEscape components to achieve the desired layout. Try to use the long components for the main layout and cut individual components as needed to fill any gaps.

4. Start with the Troughs

Begin the installation process by attaching the RainEscape troughs to the deck joists. Secure the troughs using the provided screws and ensure they are level and aligned according to your layout plan.

 Attaching the Rainescape Troughs to the Deck

Trim the troughs to fit around any posts or obstacles using a utility knife. To ensure a watertight seal, apply self-adhesive flashing tape along the joists where the troughs will be attached. Although the troughs are designed to be water-resistant, they can benefit from additional protection.

5. Seal the Edges

Apply the provided RainEscape tape along the edges of the troughs, creating a watertight seal. Ensure that the tape covers any gaps or seams and follows the deck’s contours. Press the tape firmly in place to ensure a secure bond. Finish by installing the RainEscape downspouts to direct water away from your deck.

Follow the instructions provided with the spouts for installation instructions. Once complete, your deck is now protected by Trex RainEscape! Enjoy the peace of mind that comes with knowing your deck and contents are safe from water damage. Thank you for choosing Trex RainEscape!

6. Install the Downspouts

Attach the RainEscape downspouts to the troughs, allowing water to drain from the deck. Position the downspouts strategically to direct water away from the house or other desired areas. Secure the downspouts with screws and ensure they are properly aligned and angled for efficient drainage.

To complete the installation, attach a connector to the end of each downspout and connect them to your existing drainage system. While you’re at it, make sure to check for any clogged or damaged downspouts and replace them if necessary. Make sure to seal all the joints and edges with a waterproof adhesive. With that, you’re done!

7. Flashing Installation

Install the provided RainEscape flashing around the deck’s perimeter to create a barrier between the deck and the RainEscape system. Attach the flashing securely using the provided screws, ensuring it overlaps the top of the troughs and extends down the sides of the deck.

8. Secure Connections

Ensure all connections, including troughs, downspouts, and flashing, are securely fastened. Double-check for any loose screws or gaps that may compromise the integrity of the RainEscape system. Use additional screws or brackets as needed to reinforce connections.

Double-check for Any Loose Screws or Gaps

If fasteners have been exposed to weather, replace them with waterproof fasteners. Although the installation of TREX RainEscape does not involve electrical wiring, it is important to double-check for any exposed wiring that may pose a safety hazard.

9. Test for Water Flow

Before completing the installation, conduct a water flow test to ensure proper drainage. Use a hose to simulate rainfall and observe the water flowing through the RainEscape system. Make any necessary adjustments to the troughs, downspouts, or angles to ensure efficient water flow and prevent pooling.

While testing, pay attention to any areas where water may be pooling or not draining. Adjust the system as necessary to make sure it is functioning properly, and the water is draining properly. However, be aware that some pooling may occur in the center of the deck.

10. Finish the Deck Surface

Once the RainEscape system is installed and tested, finish the deck surface according to your preferences. This may involve installing decking boards, railings, or any other desired features. Ensure that the deck surface is properly sealed and waterproofed to complement the Rain Escape system and provide long-lasting protection.

To avoid creating a trip hazard, be sure to caulk all the gaps between boards or trim. When finished, you and your family can enjoy your newly dry and protected outdoor space.


Installing Trex Rainescape on your existing deck is a great way to help protect yourself and your family from the weather. With its easy installation process, you will be able to quickly update your space in no time. In addition to providing protection for your deck, Trex Rainescape also adds aesthetic value to your outdoor living area.

With careful planning and following the above steps, you can easily install Trex Rainescape onto an existing deck, bringing with it years of use and beauty. Investing in rainy day protection now gives you a guarantee that you won’t face any issues or damages due to water damage in the future! Thanks for reading, and we hope this has given you some inspiration on how to install trex rainescape on existing deck!

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Adrian Green

Adrian has been interested in woodworking since he was a child. His father had a woodworking shop, and Adrian would help him out and learn from him. He gained basic carpentry knowledge as well as an understanding of how to work hard and take care of business. He enjoys woodworking as a hobby. He loves the feeling of creating something with his own hands, and the satisfaction that comes from seeing his finished products used by others. So he started this blog to spread his passion and knowledge to those interested in DIY wood-working projects. He knows that with a little guidance and practice, anyone can create beautiful pieces of furniture or décor from scratch.

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