Roof Bracing

Ive been looking at the rules for super stock and it says the floor, ceiling, and dash must be oem.
Does this mean i cant have any sound deadener on my roof? Unless i want to be put in supermodified?

Im also thinking about sandwiching some 1/4" thick aluminum bar between 2 layers of deadener to add strength to my roof. Is this ok for the superstock class?

Or does the superstock rule mean i just have to be able to put the headliner back on?

from what I read, you can put deadener on, but thats it!!!!!!!!!!!!!!