Advantages of Adding an Under-Deck Drainage System

Using a network of troughs and downspouts, a deck drainage system captures and diverts water away from a deck to protect the substructure from moisture and to create dry, usable space beneath an elevated deck. These systems act like shingles on a roof to shield the wooden foundation from moisture penetration and damage. Without protection, an average timber substructure can begin to deteriorate after just 10 years, while a deck drainage system can extend the life of a deck and its framing for decades.

Once protected, the area below the deck surface can be used like any room inside a house. Homeowners can add utilities to power lighting, ceiling fans, appliances and entertainment components to create additional outdoor living space. The area can also be used as bonus storage space for stowing everything from lawn and garden equipment to pool supplies, patio furniture, and even boats and ATVs.

Under-Deck Drainage Systems Options

Under-deck drainage systems broadly fall into two categories – those installed beneath the substructure framing and those applied above the joists. Most contractors prefer drainage systems installed above the joists between the substructure and the deck boards for optimal protection and design flexibility. This method uses poly or rubberised membranes draping over the joists and bearers, ensuring the entire substructure is shielded from moisture penetration. Furthermore, the membrane material accommodates a broader range of ceiling options for homeowners seeking a finished aesthetic.

In both cases, deck drainage systems are relatively simple to install and require minimal tools. Trex^® RainEscape^®, for instance, is an above-the-joist system that includes just five SKUs and can be installed in a few hours using just a stapler, utility knife and caulk.

An Upgrade to Drive Customer Satisfaction, Revenue and Referrals

An under-deck drainage system is an upgrade that allows contractors to drive increased profit potential without hiring additional employees. Assuming a margin of 20% on a typical 30-square-metre deck, a contractor can potentially earn a few thousand dollars more by adding an under-deck drainage system to a project. Over a year, these minor increases can have a major impact on the bottom line.

The best part is an under-deck drainage system is an upgrade that contractors can feel confident selling. While it may increase the cost of a deck project, most homeowners feel it is well worth the investment – especially after the first rainfall when they experience firsthand the value of having dry outdoor living space they can enjoy even in inclement weather. Additionally, protecting the structural integrity of their deck’s substructure affords homeowners peace of mind and can lead to referrals and more business.

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