60 minute fire rated soffits

I’m having trouble sourcing solutions for fire rating the underside of a balcony, I’ve only found 3:

  1. PacBld Pro PFP (testing and construction details updated July 2018)
  2. GIB with another weatherproofing cladding over top (architect doesn’t like this one!)
  3. HEBEL XL 75mm

Just to clarify, the construction is 190x45 timber joists, 60/60/60 rating required.
The PacBld solution requires 240mm joists.

Does anyone know of anything else available?
Thanks in advance.

I am currently looking at Promatect H for a site to use under a first floor deck. It is “resistant to the effects of moisture and will not physically deteriorate in damp or humid conditions. Performance characteristics are not degraded by age or moisture.” It can be painted for added ‘weather proofing’. A possibility?

Thanks John, but I’d forgotten to put that one in my list. They also need a minimum 240mm joist depth.