How to tie down a load on a car roof or truck
To tie down a load, use at least two rated ratchet or cam straps over the load, anchored to the roof rack, tie-down points or bed hooks, not to plastic trim. For long items such as a kayak or lumber, add a line from the front and back to the vehicle. Shake the load hard, give straps a twist so they do not hum, and recheck after the first ten minutes of driving.
About 20 minutes to learnTake care: injury or damage if careless
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How to do it
- Check the strap's working load limit on its label and that your roof rack's load limit covers the load.
- Put the heaviest items low and toward the front, with nothing hanging over the windshield.
- Run at least two straps over the load, each anchored to a solid rack bar, tie-down point or bed hook.
- Tighten the straps until the load cannot slide, without crushing it.
- Put a twist in each strap between rack and load so it does not hum or flap at speed.
- For long items, add a bow line and a stern line down to solid points on the vehicle.
- Tie a bright flag or cloth on anything sticking out past the back of the vehicle.
- Grab the load and shake it hard, then stop after ten minutes of driving and retighten.
Stop and call a professional if
- The load is heavier than the roof rack or strap ratings, or too long for your vehicle: rent a truck or trailer, or use a delivery service.
- Something comes loose on the highway: pull over safely with hazards on, and do not run into traffic to fetch it; call the police non-emergency line or 911 if it blocks a lane.
Common mistakes
- Relying on bungee cords, which stretch and let the load shift.
- Anchoring straps to plastic trim or door handles.
- Leaving loose strap ends flapping against the paint or trailing on the road.
- Skipping the recheck after the first few miles.
Quick self-check
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Teach this to someone
A one-page sheet for showing a friend, a roommate or a kid: what to say, what to show, and one question to check it landed.
Teach: How to tie down a load on a car roof or truck
What to say
To tie down a load, use at least two rated ratchet or cam straps over the load, anchored to the roof rack, tie-down points or bed hooks, not to plastic trim. For long items such as a kayak or lumber, add a line from the front and back to the vehicle. Shake the load hard, give straps a twist so they do not hum, and recheck after the first ten minutes of driving.
What to show, in order
- Check the strap's working load limit on its label and that your roof rack's load limit covers the load.
- Put the heaviest items low and toward the front, with nothing hanging over the windshield.
- Run at least two straps over the load, each anchored to a solid rack bar, tie-down point or bed hook.
- Tighten the straps until the load cannot slide, without crushing it.
- Put a twist in each strap between rack and load so it does not hum or flap at speed.
- For long items, add a bow line and a stern line down to solid points on the vehicle.
- Tie a bright flag or cloth on anything sticking out past the back of the vehicle.
- Grab the load and shake it hard, then stop after ten minutes of driving and retighten.
When to stop and call a professional
- The load is heavier than the roof rack or strap ratings, or too long for your vehicle: rent a truck or trailer, or use a delivery service.
- Something comes loose on the highway: pull over safely with hazards on, and do not run into traffic to fetch it; call the police non-emergency line or 911 if it blocks a lane.
The check question
Ask: Why use rated straps instead of bungee cords?
Related skills
- Knots every man should know
- How to hitch and back up a trailer
- What to keep in your car emergency kit
- Every skill in Outdoors
Sources
- Roof rack and strap maker's load ratings and instructions, per product. Checked September 28, 2026.
Last reviewed . First published .