Fire Rating for Roof Assembly
Fire Rating for Roof Assembly
(OP)
Where might one find a tested assembly for a concrete slab or a hollow core plank roof deck with polyiso insulation and EPDM roof membrane (no ceiling). This seems like a pretty basic assembly, but I can't find anything in the UL Classifications.
For a plain 6" slab, Table 720.1 (2009 IBC) lists up to ~3-hour rating, but then Section 720.1 says "Where materials that change the capacity for heat disipation are incorporated . . . fire test results or other substantiating data shall be made available to the building official to show that the required fir-resistance-rating time period is not reduced."
Does anyone know if this data exists for this seemingly simple assembly?
Thanks for any assiatance.
For a plain 6" slab, Table 720.1 (2009 IBC) lists up to ~3-hour rating, but then Section 720.1 says "Where materials that change the capacity for heat disipation are incorporated . . . fire test results or other substantiating data shall be made available to the building official to show that the required fir-resistance-rating time period is not reduced."
Does anyone know if this data exists for this seemingly simple assembly?
Thanks for any assiatance.





RE: Fire Rating for Roof Assembly
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RE: Fire Rating for Roof Assembly
Are we talking about a horizontal assembly or are you talking about roof coverings?
RE: Fire Rating for Roof Assembly
RE: Fire Rating for Roof Assembly
RE: Fire Rating for Roof Assembly
It seems absurd that even if I use 4-foot thick roof slab, the building code will not permit it for a rated assembly of any duration if I put just an inch of insulation on top.
RE: Fire Rating for Roof Assembly
RE: Fire Rating for Roof Assembly