Does your deck endure standing water, stains, or structural damage over time? Ignoring proper deck drainage could lead to these problems, causing your deck to deteriorate faster than expected. Without the right drainage system, you risk shortening your deck's lifespan and facing costly repairs and less enjoyable outdoor space.
We’ve worked with many homeowners to extend the life of their decks and create outdoor spaces that are as functional as they are beautiful. At Custom Built Design & Remodeling, we understand how crucial it is to protect your deck from the damaging effects of water. With over 15 years of experience in deck construction and maintenance, we've seen firsthand how proper drainage can make the difference between a deck that lasts and one that fails.
In this article, you'll learn about the seven benefits of over-joist deck drainage systems for your outdoor living space:
- Increased Durability of Your Deck’s Structure
- Reinforced Home and Foundation Protection
- Expand the Usability of Your Space
- Reduced Maintenance Costs
- Aesthetic Appeal
- Environmental Control
- Enhances Your Home’s Value
The Difference Between Over and Under-Joist Deck Drainage Systems
When selecting a deck drainage system, it’s important to understand the difference between over and under-joist systems. These two types of systems vary in how installed and the level of protection they provide for your deck.
Over-Joist Deck Drainage Systems
Over-joist systems are installed directly on top of the deck’s structural joists, preventing water from ever coming into contact with the framing. These systems usually involve a waterproof membrane or panels that sit on the joists before the decking boards are laid. By channeling water away from the deck structure, over joist systems offer superior protection, reducing the risk of water damage and extending the life of your deck.
This option is ideal for homeowners who prioritize durability and long-term structural health. However, it requires more planning and labor, as the system must be installed before placing the decking material.
Common over-joist deck drainage system brands include:
Under-Joist Deck Drainage Systems
Under-joist systems are installed beneath the joists after the deck boards are already in place. These systems capture water dripping through the deck boards and divert it from the area below. Usually, troughs or panels are mounted under the joists to collect the water and direct it to a drainage system or downspout.
While under joist systems are easier to install and can be retrofitted to existing decks, they offer less protection to the joists themselves. The joists remain exposed to moisture, eventually leading to rot or damage. Despite this, under joist systems are a budget-friendly option for homeowners looking to create a dry, usable space beneath their deck.
Which System Should You Choose?
The decision between over and under-joist systems depends on your needs. If protecting your deck’s structure and ensuring long-term durability is a priority, an over-joist system is the best option. However, if you’re seeking a quick, cost-effective solution or want to retrofit an existing deck, an under joist system will help create a comfortable, dry area underneath your deck.
1. Increased Durability of Your Deck’s Structure
Water is the number one enemy of wood, and when it comes to your deck, it can cause significant damage over time. A deck drainage system, particularly one installed on top of the joists, keeps water from infiltrating the structural elements of your deck, such as the joists, beams, and posts.
By keeping water away from key components, you’ll extend the lifespan of your deck’s structure. Plus, with a 50-year warranty, your deck becomes a long-term investment that pays for itself over time.
If you don’t install an over-joist deck drainage system:
- Water will seep into the joists, beams, and posts, leading to mold, mildew, and rot.
- Your deck’s structural integrity will be compromised, reducing its lifespan.
- You may face costly repairs or a full deck replacement sooner than expected.
For those using composite decking like Trex, an over-joist drainage system ensures that the deck’s frame remains dry, maximizing the warranty and durability of your investment.
2. Reinforced Home and Foundation Protection
PC: Pinterest
Beyond safeguarding your deck, a proper drainage system is essential in protecting your home’s foundation. Water runoff from your deck can accumulate around your home, leading to foundation issues, erosion, and basement flooding. By directing water away from your property, a deck drainage system helps maintain the integrity of your home’s foundation.
If you don’t manage deck drainage properly:
- Water can pool around your foundation, leading to cracks, erosion, and costly repairs.
- Your basement or lower level could become prone to flooding and dampness, making it less usable.
Installing a drainage system that connects to your home’s gutter system can help control water flow and prevent these issues.
3. Expand the Usability of Your Space
One of the most appealing benefits of a deck drainage system is the potential to double your outdoor living space. By installing a drainage system beneath your deck, you can create a dry, usable area below—perfect for a hot tub, grill, dining space, or extra storage.
If you don’t add a drainage system:
- The space beneath your deck will remain underutilized and often damp.
- You’ll miss out on the opportunity to expand your outdoor living space and use it during rainy days.
- Your joists will become moldy, dusty, and filled with cobwebs that will shorten your space's lifespan.
- While you can still use your walk-out deck without a drainage system, you won’t be able to use the under-side area when it rains.
With the option to customize the ceiling under your deck—whether with wood or aluminum—you can create a beautiful, functional area that suits your style. For a personalized touch, you can paint your deck ceiling in any color that suits your style. You’ll also have a wide range of design options, such as classic tongue-and-groove paneling, beadboard, or even sleek modern finishes.
4. Reduced Maintenance Costs
PC: Econodek
A proper deck drainage system also reduces the time and money spent on maintenance. Without it, dirt, debris, and water can accumulate, especially on your joists, leading to a worn-out deck that weathered far too quickly.
If you neglect deck drainage:
- You’ll face frequent cleaning and more significant maintenance issues.
- Your deck’s appearance will degrade faster, detracting from your outdoor space’s appeal.
5. Aesthetic Appeal
A well-designed deck drainage system does more than protect your deck—it enhances the look of your outdoor space. Whether you’re creating a cozy area for dining or an entertainment zone complete with a hot tub and grill, keeping the area below your deck dry ensures it remains a functional and attractive home extension.
If you skip the drainage system:
- Your outdoor space may be subject to water damage, reducing its visual appeal.
- Rain or dampness could limit your ability to use the space below your deck.
Installing a deck drainage system allows you to enjoy your outdoor space no matter the weather, with the option to add features like ceiling fans to keep the area comfortable and dry.
6. Environmental Control
PC: Houzz
Finally, a proper deck drainage system provides essential environmental control, helping you manage water and erosion around your property. Especially in areas with walkout basements, where water can pool due to the lower grade, a drainage system helps redirect water away, making the space more usable.
If you don’t control water runoff:
- Erosion could damage your landscaping and lead to foundation issues.
- Your yard or basement may become less usable due to constant dampness.
You can manage water flow and protect your property by integrating your deck’s drainage system with your home’s gutter system.
7. Enhances Your Home’s Value
Over-joist deck drainage systems enhance your home’s value by transforming the space beneath your deck into a functional, all-weather area.
Keeping the lower level dry allows you to double your outdoor living space, creating opportunities for features like an outdoor kitchen, TV area, hot tub, or even a shaded sitting area for warmer months. You can also plan for future expansions like a screened-in porch or a four-season room.
With an over-joist deck drainage system, you won’t be limited by weather conditions, ensuring you can use your outdoor space year-round. This added functionality and versatility significantly boost your home’s value, making it an attractive feature for future buyers.
Why We Recommend Trex RainEscape for Your Deck Drainage System
At Custom Built, we highly recommend Trex RainEscape for homeowners looking to protect their deck investment and enhance their outdoor living experience. Trex RainEscape is a top-of-the-line over-joist drainage system designed to keep your deck structure dry and safe from water damage.
Unlike traditional systems that allow water to seep through the decking boards, Trex RainEscape effectively channels water away from your deck, preventing moisture from reaching the joists and beams.
Here’s why Trex RainEscape stands out:
Superior Protection
By diverting water away from the deck’s structure, Trex RainEscape helps prevent mold, mildew, and rot, which can significantly extend the lifespan of your deck.
Maximized Usable Space
With Trex RainEscape, the area beneath your deck remains dry, allowing you to create additional outdoor living space. Imagine a dry, comfortable area perfect for lounging, entertaining, or even adding outdoor amenities like a kitchen or hot tub.
Enhanced Aesthetics
The system is hidden from view, maintaining the clean, polished look of your deck. You can also customize the underside of your deck with various ceiling finishes, adding to the overall appeal of your outdoor space.
Trex RainEscape isn’t just about protection—it’s about getting the most out of your outdoor space, both in terms of function and aesthetics. We recommend this system to any homeowner who wants to ensure their deck remains a durable, inviting retreat for years to come.
Next Steps to Building or Remodeling Your Deck
Protecting your deck from water damage is crucial to its longevity and usability. Without a proper drainage system, your deck is at risk of rot, mold, and costly repairs that could have been avoided. A well-installed deck drainage system ensures that your outdoor space remains a beautiful, functional, and long-lasting part of your home.
By reading this article, you’ve learned how to safeguard your investment, extend the lifespan of your deck materials, and protect your home’s foundation. The increased usable space and reduced maintenance costs make it a worthwhile investment for any homeowner looking to maximize their outdoor living area.
At Custom Built Design & Remodeling, we understand the importance of a well-maintained deck that stands the test of time. With over 15 years of experience in designing and building decks, we’re here to help you make the most of your outdoor space. Our team is dedicated to providing advice and top-quality solutions for all your decking needs.
Ready to take the next step? Protect your deck and enhance your outdoor living space today with our expert installation of deck drainage systems. Contact our team of professionals to learn more about how we can help you create the perfect deck for your home.
Now that you know more about the importance of deck drainage systems, let’s explore how much composite decks cost, our honest review of Trex RainEscape, and the projects that can increase the resale value of your home:
- How Much Do Composite Decks Cost in Lansing, Michigan? - An overview of how much your Lansing composite deck will cost and the factors that will influence your price.
- A Thorough Review of Trex RainEscape - An expansive dive into the key characteristics and drawbacks of one of the most popular deck drainage systems on the market.
- 5 Remodeling Projects That Can Increase Resale Value - A high-level review of the various remodeling projects that will increase your home’s resale value, curb appeal, and return on investment.
