Care and transport

Roof Load Limits Explained

by Akayak Editors

Before putting your kayak on the roof, find the weight limits for your exact vehicle, rack and kayak carrier. Count the hardware as well as the boat when checking a total roof-load limit. Follow the lowest limit after checking what weight each rating includes: a boat-only rating counts only the boat, while a total roof-load rating also counts hardware.123

This page summarizes published safety guidance. It is not a substitute for instruction, and conditions on your water may differ. Check the current rules for the state and water you paddle.

Key Takeaways

  • Match the vehicle manual and rack fit guide—the maker’s lookup of parts and limits—to your exact vehicle and roof type.45
  • Include the rack, kayak carriers, boat and other roof cargo when checking total roof weight.1
  • Check boat weight separately against the kayak carrier’s rating.3
  • Use the limit for driving when transporting your kayak.2
  • Resolve missing or conflicting limits with the maker, dealer or qualified installer before loading.12

Which limits apply to your roof?

Roof rails run along the roof. Crossbars span across it and support the equipment carrying your boat. Feet are the mounting parts that attach a rack added after purchase (an aftermarket rack) to the vehicle; a fit kit supplies the mounting parts for a particular vehicle and roof type. The kayak carrier is the accessory that holds the boat on the crossbars.642

Check these limits:

  • Vehicle roof and factory hardware: the vehicle manufacturer supplies the vehicle’s capacity. Your owner’s manual is also the place to check factory crossbar limits and any separately stated rail or factory-rack limits.47
  • Complete aftermarket rack: the rack maker’s vehicle fit guide supplies the applicable allowance for its system on your car. Read the fit notes (extra details about the fit for your vehicle) as well as the headline number.25
  • Crossbars: check the maker’s rating and whether it covers a pair. Yakima lists its JetStream complete roof rack at 165 pounds (75 kilograms) across two bars for on-road use; that is one allowance across the pair, subject to the vehicle-specific fit limit. For unpaved or poorly maintained roads, check the reduction and calculation instructions for your exact rack configuration.829
  • Kayak carrier: check the accessory maker’s boat-weight rating, including any separate allowance for carrying two boats.3

A higher crossbar rating does not raise a lower vehicle or complete-rack limit. You must satisfy all applicable limits together.12

Rack type can change the allowance. Thule lists 165 pounds (75 kilograms) for its Evo Clamp feet, made for vehicles without existing attachment points or factory racks, and 220 pounds (100 kilograms) for its Evo Raised Rail feet, made for vehicles with raised railings. Both are ratings for those Thule systems, not for every rack of that type, and Thule tells you to also check your vehicle’s maximum roof load.1011

Find your limits in six steps

Identify your vehicle and roof, check its manual, check the complete rack fit, check the kayak carrier, calculate the weights, then resolve anything unclear.

1. Identify your exact vehicle and roof

Record the make, model, model year and roof type before using a rack selector. Include the roof equipment the selector asks about; Thule’s selection process uses all four details to identify a suitable rack.4

Use the manual for your own vehicle. Roof equipment can change the allowance. For example, Ford’s 2020 Explorer manual gives a maximum recommended load of 75 pounds (35 kilograms) with a moonroof and 165 pounds (75 kilograms) without a moonroof, with the load evenly distributed on the crossbars. These figures apply only to the 2020 Explorer under those conditions; other model years may differ.6

2. Find the vehicle and factory-rack limits

Look in the owner’s manual under roof racks, load carriers or a similar heading. Write down each applicable limit and its conditions. Check factory crossbar limits as well as the vehicle’s roof allowance.67

Beside each number, record what it covers. If the wording leaves you unsure whether hardware is included, ask the vehicle manufacturer or dealer before using it in your calculation.41

3. Check the complete rack fit

Use your rack maker’s vehicle fit guide. Read the returned fit notes and the instructions for the specified bars, feet and mounting parts. Yakima’s lookup provides vehicle-specific details, approved accessories and fit notes; Thule provides downloadable manuals through the selected rack’s Instructions tab.54

Record the complete system’s allowance, plus any separate crossbar limit. Yakima defines its fit-guide limit as the combined weight of the rack system and load while the vehicle is moving.2

For a glass roof, follow the mounting instructions for your exact fit. Thule permits racks on cars with glass roofs unless the applicable mounting instructions specify otherwise.1

4. Check the exact kayak carrier

Find the carrier’s product instructions and weight rating. Check whether the rating applies to one boat or the combined weight of two boats.3

If you have a Yakima JayLow, check its manufacture date using the downloadable guide to the code that identifies when it was made, under Installation on Yakima’s JayLow page: Yakima gives units manufactured before February 1, 2026 lower boat-weight ratings than newer units. Check the minimum crossbar spread—the distance between the front and rear bars—in your unit’s instructions too; models manufactured before February 1, 2026 require at least 24 inches (61 centimetres). The product name alone is not enough to choose the weight rating or minimum spread.37

Keep a boat-only carrier rating separate from total roof-load limits. Do not subtract the base rack’s weight from a rating that applies only to the boat.31

5. Add the weights and check each allowance

For a total roof-load limit, calculate:

Base rack hardware (bars, feet and mounting parts) + kayak carriers + kayak or kayaks + all other roof cargo = total roof weight.17

Include other accessories attached to the bars, even when you are not using them. Gear carried with the boat also belongs in the roof-cargo total.27

Use the specifications for your exact equipment, or weigh it if needed. Then check the total against every limit defined as total roof load. If the maker says its limit counts different items, follow that list.12

Separately compare the boat weight with the carrier’s boat-only allowance. For a combined two-boat rating, add both boats.3

To work out how much boat weight remains under a total-load ceiling, subtract the rack, carriers and other roof cargo from that ceiling. Compare the remaining allowance with the carrier’s boat-only rating. The smallest comparable allowance governs.123 The load must also be spread evenly across the rack, even when its total weight is below every applicable limit.1

6. Resolve missing or conflicting information

First check that the numbers describe the same vehicle, roof equipment, rack parts, carrier version and use. Also check whether they include the same weights. A lower vehicle limit and a higher bar rating can both apply; they do not give you a choice.123

If the fit or limit remains unclear, leave the kayak off the roof while you obtain clarification. Thule directs product-limit questions to its dealer. Yakima says the installer must determine the maximum weight for custom or unlisted vehicles; contact maker support or a qualified installer for that assessment.12

Driving weight versus parked weight

A dynamic limit applies while the vehicle is moving. A static limit applies while it is parked. Yakima uses these terms in its rooftop-tent guidance, but a parked tent allowance does not replace the driving limit for kayak transport.122

Do not assume parking increases your allowance. Thule’s general rack safety instructions say its maximum applies both while driving and while parked. Follow the instructions for your particular products.1

Where next

Staying within the weight limits is one part of roof transport. Follow how to tie down a kayak for securing the boat, and visit care and transport for related guides.

For further planning, look for kayak roof racks compared, carrying two or more kayaks (coming soon), and kayak trailers (coming soon).

Footnotes

  1. https://www.thule.com/-/s/approved/std.lang.all/71/96/617196.pdf ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9 ↩10 ↩11 ↩12 ↩13 ↩14

  2. https://yakimasupport.zendesk.com/hc/en-us/articles/360018593232-Weight-Limits ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9 ↩10 ↩11 ↩12 ↩13 ↩14

  3. https://yakima.com/products/jaylow ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9

  4. https://www.thule.com/en-us/articles/guides/what-can-i-use-my-thule-roof-rack-for ↩ ↩2 ↩3 ↩4 ↩5 ↩6

  5. https://yakimasupport.zendesk.com/hc/en-us/articles/360044754231-Fits-how-to-see-what-will-work-with-your-car ↩ ↩2 ↩3

  6. https://www.fordservicecontent.com/Ford_Content/Catalog/owner_information/2020-Ford-Explorer-GasHEV-Owners-Manual-version-2_om_EN-US_06_2019.pdf ↩ ↩2 ↩3

  7. https://yakimasupport.zendesk.com/hc/en-us/article_attachments/115000272208 ↩ ↩2 ↩3 ↩4 ↩5

  8. https://yakima.com/pages/crossbar-basics ↩

  9. https://cdn.shopify.com/s/files/1/0639/2607/5561/files/YAKIMA_2026_-_Load_Rating_Document_-_REV_E.pdf?v=1783392195 ↩

  10. https://www.thule.com/en-us/roof-rack/roof-racks-and-accessories/thule-evo-clamp-_-710501 ↩

  11. https://www.thule.com/en-us/roof-rack/roof-racks-and-accessories/thule-raised-rail-evo-_-710405 ↩

  12. https://yakimasupport.zendesk.com/hc/en-us/articles/115002660548-Weight-Limit-Greater-than-165lbs ↩