Question & answer
Can You Put a Roll-Up Cover Over a Bed Liner?
Usually, yes, but an over-the-rail liner means cutting. Tyger's sheets call for small 2 x 4 in holes in the liner so the clamps can reach the bed rail. An under-the-rail liner or a spray-in is a different matter, so check your own cover's sheet.
The short answer
Yes, on the sheets we read. If your liner goes over the rail, Tyger's sheets say to cut small 2 x 4 in holes where the clamps go, so they grip the bed rail. Spray-in liners and under-the-rail liners are not addressed in the sheets we read. Check yours before you buy, and cut only after placing the clamps.
What the sheet says
Tyger's T1 sheets speak to one case: an over-the-rail bed liner. Small 2 x 4 in holes get cut so the clamp can do its job. That is the whole instruction. It does not say your liner is ruined, or that you should remove it.
We did not find similar wording in Gator's general sheet or in Rough Country's hard roll-up manual. That does not mean those covers ignore a liner. Their clamps still need the bed rail. It means we cannot quote them on it.
How to do it
This order comes from common sense, not from a sheet, so read yours first:
- Set the side rails and clamps in place without tightening them.
- Mark on the liner where each clamp lands.
- Take the rails back off.
- Cut the small holes at those marks, 2 x 4 in as the Tyger sheet says.
- Reinstall the rails, then tighten once everything is lined up.
If you cut before placing, you risk holes that do not line up. A liner can't be un-cut, so take your time.
Which liner do you have?
Over the rail. It laps over the top of the bed side. This is the one the Tyger sheet addresses.
Under the rail. It stays below the rail. There may be nothing to cut, but look at how it sits where the clamp lands.
Spray-in. It is a coating, and no sheet we read addresses it. Check how thick it sits on the rail.
Not sure? Look along the top of the bed side. If plastic covers the rail, it is over the rail.
Other things a liner touches
A cover's seals bear on the front of the bed and on the tailgate, and a liner can change how those meet. If you get water after install, the liner is on the list of things to check. See leak fixes. The install guide has the rest of the job.
What to ask before you cut
Ask the seller, or read the sheet, for these: does this cover clamp under the rail or over it, how much room does the clamp need, and does the maker want the liner trimmed or the holes cut? If there is any doubt, leave the liner alone until the cover is in your hands and you can hold a clamp up to the rail.
What owners ask
Does a spray-in liner matter?
The sheets we read do not address spray-in liners. Since a spray-in sits on the bed surface and does not lap over the rail in the way a drop-in might, check how yours sits where the clamps land.
Do I have to cut my liner on every cover?
Tyger's sheets call for it on over-the-rail liners. We have no equivalent statement from Gator or Rough Country. Read your own sheet before you cut anything.
Could the liner change my measurement?
It can. A liner has thickness at the front wall and tailgate. Measure to the bed walls as your sheet describes, and tell the seller whether you measured with a liner in place.
Sources
Where to next
- 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.
- How-toMeasure your bedMeasure your truck bed in one minute: from the front wall to the closed tailgate, along the floor. Then compare inches with the title, because bed names differ.
- TroubleshootingLeak fixesWater under your roll-up cover? Check crossbars, tension, front seal and tailgate seal, in that order. Fixes come from Tyger, Gator and Rough Country documents.
- OverviewQuestionsPlain answers on leaks, weight, drilling, snow, security and fit, each taken from maker documents, with the gaps stated. No hands-on claims and no guessing.
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