OSB attached to metal trusses

[WelshTony]

I have a concrete panel garage which I want to line with OSB boards to make more use of it.
The concrete posts are joined together with metal trusses, and the plan was to replace the corrugated roof withan OSB roof and felt, but none of my local roofers want to do the job.
As an alternative I plan to install sheets of OSB under the existing metal trusses with the ends further support by the OSB boards attached to the walls.
How do I find out if the trusses are strong enough to take the weight of the OSB boards (9mm thickness)?
Any advice would be appreciated.

 

[Hank11]

You need an engineer to make a plan. And while he is at it, maybe the engineer can explain why the roofers don’t want the job.

 

[The Cobbler]

a lot more info would be needed to provide a valuable answer , and as above, you're very likely to need an engineers report

 

[Bert_]

I'm confused. You want to line the inside? Or replace the roof and use OSB decking?