Existing Roof Structure - 3" Permadeck Plank

[bookowski]

Working on a renovation of an existing building. We have original structural drawings. The original drawings may not be complete and the scans are not great. The roof is steel framed (wf sections) and noted in plan as "Gyp Plank" and in sections/details as "3in. Permadeck Plank", no other notes/specs. Anyone have any info or tips on what this may be? They want to change change the loading on the roof (to a green roof, or possibly an occupied roof terrace).

 

[KootK]

Sounds like something like this: Link

Of course, tracking down load tables etc is another matter for which I'd not hold out great hope.