Understanding
the UL Fire Resistance Directories
Numbering System for Fire Rated
Assemblies
uáááá
Membrane
protection
000- 099
100-199
200-299
300-399
400-499
500-599
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ôNext, you look at the protection you will put over the
structural element or group of construction.á The first option is Membrane
Protection.á This is protection that is
put on top of or mechanically
fastened to the structural element much like drywall is fastened to steel
studs.á Examples are concealed grid or exposed grid systems,
gypsum, metal lath and or plaster.á
These numbers fall
between 000 and 599.