Single ply- TPO? Make provision for large and fast run-off.

Built-up roof requires ballast to retard degredation.

fully adhered = glued or screwed to hold it down.
ballasted = gravel/pavers on top to hold it down.

ballasted (membrane laid loose & stones piled on as ballast) generally preferred for large roof, with minimal penetrations, lower first cost - however structure must be sized to support. difficult to find & fix leaks.

fully adhered (entire membrane glued to substrate) preferred for more complicated roof shapes & many penetrations. easier to locate leaks. - visually - all seams show. greater installed cost

great thank you!!

screwed is mechanically adhered
"glued" is fully adhered

see roof type family tree in this document

oh, but don't buy into the TPO adverstisement
PVC is the way to go with thermoplastic roofs

oh! now that site where the pdf originates seems really helpful.

can you recommend any other site like that\][;,./ oh no my kezboardlazout is fashiyyled !!

first disingenuous
and then unintelligible
did you have something to say noci?

don't be such a mean prick, waxwings

8-year old posts are known for their tendency to remain dead... but not this one apparently.

i wonder if the OP's roof is ponding or leaking?  some questions can only be answered with about a decade of hindsight.