Deck drain installation

Trex RainEscape is installed before you lay the deck boards. It is an over-the-joist deck drainage system. This type of deck drainage system allows you to finish the underside of the deck which is the ceiling of the patio below with utilities for electricity, lights, ceiling fans, entertainment components and more.

If your deck has unusual angles, oddly-spaced joists, railing posts inside the framing or other special cases, you will may need to modify the troughs and downspouts to fit the space but the approach is pretty much the same: Install downspouts and trough so that water flows to the gutter, then completely cover all seams with butyl tape.

Trex RainEscape is installed over the joists before the decking boards are installed, ensuring no water touches the joists. Protecting the deck foundation from water is essential for preserving the longevity of the deck. Some homeowners ask how to waterproof under an existing deck. This is not recommended, as it would require a system installed under the joists.

An under-the joist deck drainage system allows water to run through the deck boards over the joists and into gutters under the deck. Repeatedly exposing the joists to water will result in wood rot and decay. First, install the downspouts. These are made to fit between joists spaced 16 inches on center if positioned in one direction. If your joists are 12 inches on center, simply face the downspouts in the other direction.

The downspouts are 10 inches tall, so they fit well with 2x10 joists. If your joists are smaller, cut the funnels as needed, so they extend. If you have 2x12 joists, use extenders. Cut out a panel along the perforation using a utility knife or simply tear by hand. The technical storage or access that is used exclusively for statistical purposes. The technical storage or access that is used exclusively for anonymous statistical purposes.

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