Are Retrax Bed Covers Really Waterproof? How the Drainage System Works

Retrax bed covers are best described as highly water‑resistant, not 100% waterproof. Like most tonneau cover, they are designed to keep the majority of rain, snow, and car‑wash spray off your cargo, but a small amount of moisture can still enter around rail seals, the tailgate, or stake‑pocket openings.

In normal rainfall and everyday use, many truck owners find that their bed stays almost completely dry with a properly installed Retrax cover. During heavy storms or high‑pressure car washes, you may see a few small wet spots or light moisture in the corners of the bed.

How the Retrax Drainage System Works

Retrax uses an integrated water‑management system to move water away from the canister and out of the bed instead of letting it pool under the cover. The basic idea is simple: catch water where it lands on the cover, direct it into channels, and then push it out through drain tubes.

Here’s the typical flow:

1. Top seals and side rails catch water

   • Rubber or foam seals along the rails and at the front of the bed help block direct entry points.

   • Any water that gets past the top surface is guided into hidden channels built into the rails and canister.

2. Internal channels route water forward

   • Inside the canister area, Retrax covers use internal gutters that collect water and move it toward the front of the truck bed.

   • This prevents standing water from building up around the rolling cover mechanism.

3. Drain tubes discharge water out of the bed

   • At the front corners of the bed, plastic drain tubes connect to the canister or gutter outlets.

   • These tubes pass through pre‑drilled or user‑drilled holes and let water flow outside the bed, usually behind the cab or down the inner fender.

When the system is installed correctly and the tubes are unobstructed, most water that lands near the cover’s canister is channeled out of the bed instead of dripping onto your cargo.

Why “Almost Waterproof” Is Realistic

Even with a good drainage system, no retractable tonneau cover can guarantee a bone‑dry bed in every situation. Water can still enter through:

• Tiny gaps at the tailgate edges or latch area

• Unsealed stake‑pocket holes or bed caps

• Misaligned or loosely tightened side rails

• Worn or damaged rubber seals over time

In light to moderate rain, the drainage system handles the bulk of the water, and many users report that their cargo stays dry. Under high‑pressure car‑wash sprayers or wind‑driven storms, it’s normal to see a bit of water intrusion, which is why manufacturers describe their covers as water‑resistant rather than fully waterproof.

Tips to Get the “Driest” Possible Retrax Setup

To maximize how dry your truck bed stays with a Retrax cover:

• Follow the installation instructions carefully so the rails sit level and the seals make full contact with the bed.

• Use additional foam or weather‑strip tape in known trouble spots, such as the front bed panel, stake‑pockets, or small gaps between the rails and bed caps.

• Ensure the drain tubes are properly connected and routed through clean holes that let water flow freely outside the bed.

• Check seals periodically for wear, cracking, or gaps and replace or adjust them as needed.

With careful installation and a bit of extra sealing, most owners find their Retrax bed cover to be “about as waterproof as a tonneau can get,” keeping tools, luggage, and gear well protected in real‑world conditions.