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[Steveplumb]

Ok this is a strange one .......

As part of a building project a heavy steel beam need to be supported at one end while it is pulled into position .  impossible to give all the details. but

What are your thoughts on my old estate having a flat board on the roof bars that are mounted on the rails to spread the load supporting in the region of 450kg. 

I know this is well outside any recommendation limits but at around 112kg per roof mount point ......... !!!!! would it dent the roof ??  how much would the suspension lower under the load etc.

Any thoughts on what this would 'do' to my estate welcome . any one extreme roof loaded their Mig before ??

[Diamond Black Geezer]

As you say, denting the roof is the concern, but you're not actually driving the car, it's simply meant as a means of support. It's a very fat bloke (apologies to any OOFer who does weight that or more !) on each mounting point, basically. Hmmm.. tricky one!

Quick bit of maths (not my strong point!) and if the roof will take six 12-stone blokes, then you should be ok. I'd suggest adding them on by not, not all leap on it at once from a great height 

[Marks DTM Calib]

Denting the roof is the least of your concerns, bending the A-B-C posts and structural members of the roof is.

[chris at brid]

think the roof bars would bend first.
i would save the car and use a scaffold tower to do the job 

[05omegav6]

think the roof bars would bend first.
i would save the car and use a scaffold tower to do the job

Agreed...

Roof load limit is actually 100kgs IN TOTAL.