How to Install Roof Rails: Factory Mounting Points, Kits and When to Get Help
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Roof rails are the front-to-back bars along the edges of the roof. If your car didn’t come with them, you can sometimes add them, but how easy it is depends entirely on whether the roof has factory mounting points. This guide explains how to tell, what the install involves, and when to let a professional do it.
If your car already has rails and you just need crossbars, read what is a roof rack.
Table of Contents
Step 1: Check for Factory Mounting Points
Many vehicles sold without rails still have threaded mounting points under trim strips or plastic covers along the roof. Check:
- Your owner’s manual and the dealer’s parts catalog for a roof rail kit
- Under the roof molding strips (gently, with a trim tool)
- Whether the same model is sold with rails on higher trims
If your vehicle has factory points, an OEM or vehicle-specific aftermarket kit bolts into them without drilling.
Step 2: Choose the Right Kit
- OEM rails: match the factory look and fit. Usually the most expensive.
- Vehicle-specific aftermarket rails: designed for the same mounting points.
- No mounting points: consider a bare-roof crossbar system that clamps into the door frames instead of adding rails.
Step 3: Install a Bolt-On Rail Kit
Follow your kit’s instructions exactly. A typical install:
- Wash and dry the roof.
- Remove the trim strips or covers over the mounting points.
- Position the rails with any gaskets or sealing pads in place.
- Thread the bolts by hand first so they don’t cross-thread.
- Tighten to the torque in the instructions with a torque wrench.
- Reinstall trim or covers.
- Water-test the roof with a hose and check inside for leaks.
Why Drilling Is a Job for Pros
Drilling into a roof without factory points risks leaks, rust, damaged wiring or airbags, and a weakened panel. Many manufacturers warn against it. If you must drill, use a qualified installer who can seal and rust-proof every hole.
After Installation
- Check the bolts after the first few hundred miles and periodically after.
- Respect the vehicle’s roof load limit. Thule explains that the lowest of the rack’s or vehicle’s limit applies, including the rack’s own weight.
- Remember the extra drag. FuelEconomy.gov notes that hauling cargo on the roof lowers fuel economy.
Alternatives to Adding Rails
| Option | Drilling? | Best for |
|---|---|---|
| Bare-roof crossbar system | No | Cars without rails or mounting points |
| Hitch cargo carrier | No | Heavy loads and better fuel economy |
| Soft roof bag (strapped through doors) | No | Occasional use. Check the bag’s instructions |
Frequently Asked Questions
Can I add roof rails to my car?
Often, if your roof has factory mounting points. Otherwise, a bare-roof crossbar system is the safer choice.
Do I need to drill to install roof rails?
Not if your car has factory points. Drilling should be left to professionals, if done at all.
How much do roof rails cost?
It varies widely by vehicle and whether you buy OEM or aftermarket. Get a quote from your dealer and compare kits.
Are roof rails and roof racks the same?
Rails run front to back. A rack adds crossbars that run side to side.
The Bottom Line
To install roof rails, start by finding factory mounting points, then use a vehicle-specific kit with proper seals and torque. If your roof has no points, skip drilling and choose a bare-roof crossbar system instead.
