Dow Protected Membrane Roof EN - Manual (Page 21)

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2 1
ULI Hourly Fire
Resistance Ratings for
PMR – Steel Deck
Note: Always refer to the actual listing for complete details, including
maximum thickness of insulation allowed. For details, call Dow at
1-866-583-BLUE (2583).
Assembly #
P-225, P-226, P-235
(New PMR)
P-404
(New PMR)
P-801, P-805
(Retrofit PMR)
P-803
(Retrofit PMR)
P-811
(New PMR)
P-813
(New PMR)
P-908
Rating (hrs)
1, 1-1/2
1-1/2
1, 1-1/2, 2
1, 1-1/2
1, 1-1/2, 2, 3
1, 1-1/2
2
Description
Steel deck
1/2" or 5/8" (13 mm or 16 mm)
Type X gypsum (varies)
Bar joists
Suspended ceiling
Steel deck
1" (25 mm) mineral or fiberboard
Bar joists
Plaster ceiling
Steel deck
Mineral or fiberboards
Spray fiber fireproofing
Beam construction
Steel deck
Mineral or fiberboards
Spray fiber fireproofing
Bar joists
Steel deck
5/8" (16 mm) Type X gypsum
Spray fiber fireproofing
Beam construction
Suspended ceiling (optional)
Steel deck
5/8" (16 mm) Type X gypsum
Spray fiber fireproofing
Bar joists
Steel deck
3-5/6" (97 mm) vermiculite concrete
Beam construction
Conditions, Issues and Ratings
F I R E A N D W I N D R A T I N G S