Troubleshooting
Roll-Up Tonneau Cover Leaking? Fixes From the Sheets
First accept that no cover is fully waterproof, as RealTruck says. Then check the things the sheets warn about: crossbars arched upward, tension, the front seal, and whether the tailgate touches the rear seal. Most of these take minutes, and none takes a new cover.
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The short version
Start with the crossbars: Tyger says they must arch upward, or water pools. Then check tension at the plate, the front seal strip, and that the tailgate meets the rear seal. Rough Country says to move the rails toward the tailgate if it does not. If water still gets in after high-pressure washing, RealTruck says slight seepage may occur.
Where to look, in order
Find where it gets in
Hose the cover gently with someone in the bed, or lay paper towels at the front corners, the sides and the tailgate. It costs nothing, and it saves you guessing. This tip is ours, not a maker's.Check the crossbars
Tyger's sheet says crossbars must arch upward. If they do not, water pools. Flip any that sit the wrong way.Check the tension
Tyger's tension plate moves in steps of 1/8 in. A slack cover pools and drips. Tighten to your sheet, not beyond.Check the front
If the front bed rail sits low, Tyger says to apply the front seal strip. Gator and Rough Country both call for foam seals on install. Make sure yours are there and seated.Check the tailgate
Rough Country says to move the rails toward the tailgate if the tailgate does not touch the rear seal. Tyger says to move the assembly toward the tailgate if the cover falls short.Check the rails
Tyger has you line up the inside edge of the side rail with the inner edge of the bed rail. Then look at the clamps. Gator says to check them after a week and periodically.
Symptoms and likely causes
| What you see | First thing to check | Source |
|---|---|---|
| Water pooling on top | Crossbars, tension | Tyger |
| Drips at the tailgate | Rear seal contact, rail position | Rough Country, Tyger |
| Drips at the front | Foam seal, front seal strip | Gator, Tyger |
| Drips along the sides | Rail alignment, clamps | Tyger, Gator |
| Water after a pressure wash | May be seepage, as RealTruck says | RealTruck |
| Water around a liner | How the liner meets the rail | Tyger |
On a hard roll-up
Rough Country's cover has two drain tubes. If they are kinked or came loose, the drain has nowhere to go. Check them against the manual. Other hard covers may differ, so read yours.
On a truck with rails
On a Tacoma or Frontier, a rail changes how the cover sits. Check that you followed the instructions for your rail. Tyger's sheets point to separate clamp instructions. See deck rails.
When to stop and call
If the steps above do not fix it, get in touch with the maker, and have your part number ready. Check the warranty, too. Gator's sheet gives 2 years on hard parts and fabric, and Rough Country's manual gives 3 years to the original purchaser. If the cover turns out to be the wrong one for your bed, you are looking at a return, not a fix. So check it against your truck and your measurement.
And if cargo really must stay dry, use a sealed box. No fix on this page changes what RealTruck says.
What owners ask
Is some water normal?
RealTruck says no tonneau cover is entirely waterproof, and that slight seepage may occur from high-pressure water. So a little after a car wash is not proof of a bad install. Standing water in a daily rain is worth chasing.
Water pools on top. Is that a leak?
Not yet, but it is a warning. Tyger's sheet says pooling means crossbars are not arched upward or tension needs work. Fix it first, because a cover not supported by its crossbars will not hold up to heavy rain or snow.
Should I add my own sealant?
We read no maker sheet that recommends it. Rough Country says to keep fuel, oils and chemicals off its cover, and Gator warns against vinyl conditioners. Ask the maker before you put anything on a seal or vinyl.
Sources
Where to next
- Question & answerDo Roll-Up Tonneau Covers Leak?Yes, some water can get past any roll-up tonneau cover. What RealTruck states, what Tyger's sheets blame for pooling, and how to keep cargo dry that has to stay dry.
- How-toInstall a roll-up coverHow a soft roll-up tonneau cover goes on, from the Tyger and Gator sheets: tools, rail placement, clamps, crossbars, tension, and the checks most people skip.
- TroubleshootingLatch fixesLatch pops up or jams on your roll-up cover? Check the clip gap, the order you latch in, the hook-and-loop strips and the tension.
- Question & answerCan You Put a Roll-Up Cover Over a Bed Liner?Usually, yes. Tyger's sheets say an over-the-rail liner needs small 2 x 4 in holes cut for the clamps. What to check before you cut, and what to ask a seller first.
Who is behind this
rolluptonneaucover.com Editorial Team
Truck fit and buying advice
We are the editorial team at rolluptonneaucover.com. We read listing titles, maker install sheets and truck makers' own bed specifications and sort them truck by truck, with sources on every page. Nobody here has bolted these covers to a truck, and nothing was measured in a lab. We say so plainly.
- Listing titles and maker sheets read
- Sources on every page
- No installs and no lab work
- Publisher details in the imprint