How to Guide

The technical content of this literature is eective 4/9/15 and supersedes all previous information.Pub. No. CD-ProSTUD 04/15
clarkdietrich.com
UL
®
FIRE TESTING
ProSTUD
®
SINGLE STUD WALL—FIRE ASSEMBLIES
A
ProSTUD CHASE OR DOUBLE STUD—FIRE ASSEMBLIES
A
ProSTUD TABLE 1: MINIMUM DEPTH OF ProSTUD REQUIRED
A
UL design no. Hourly rating ProSTUD minimum thickness
ProSTUD
minimum depth
U403 2 ProSTUD 20 (19mil) 3-5/8"
U407 1/2 or 1 ProSTUD 25 (15mil) 3-5/8"
U408 2 ProSTUD 20 (19mil) 3-5/8"
U411 2 ProSTUD 25 (15mil) 2-1/2"
U412 2 ProSTUD 25 (15mil) 1-5/8"
U419 1, 2, 3 or 4 ProSTUD 25 (15mil)
(See Table 1 below)
U421 2 ProSTUD 25 (15mil) 3-5/8"
U431 4 ProSTUD 20 (19mil) 3-5/8"
U435 3 or 4 ProSTUD 25 (15mil) 1-5/8"
U442* 1 ProSTUD 33MIL 2-1/2"
U450 1 or 3 ProSTUD 20 (19mil) 3-5/8"
U451 1 ProSTUD 20 (19mil) 2-1/2"
U454 2 ProSTUD 20 (19mil) 2-1/2"
U463 3 or 4 ProSTUD 20 (19mil) 1-5/8"
U465 1 ProSTUD 20 (19mil) 3-5/8"
U471 1-1/2 ProSTUD 20 (19mil) 3-5/8"
U475 1, 2 or 3 ProSTUD 20 (19mil) 3-5/8"
U478 3 ProSTUD 20 (19mil) 1-5/8"
U484* 2 ProSTUD 33MIL 2-1/2"
U488* 1 ProSTUD 33MIL 2-1/2"
U490 4 ProSTUD 20 (19mil) 2-1/2"
U491 2 ProSTUD 20 (19mil) 3-5/8"
U494 1 ProSTUD 20 (19mil) 2-1/2"
U495 1 or 2 ProSTUD 20 (19mil) 3-5/8"
U496 1 ProSTUD 20 (19mil) 1-5/8"
UL design no. Hourly rating ProSTUD minimum thickness
ProSTUD
minimum depth
U420 2 ProSTUD 25 (15mil) 1-5/8"
U436 1, 2, or 3 ProSTUD 20 (19mil) 1-5/8"
U444 2 ProSTUD 25 (15mil) 1-5/8"
U445* 1 ProSTUD 33MIL 1-5/8"
U466 1 ProSTUD 20 (19mil) 2-1/2"
U493 2 ProSTUD 25 (15mil) 2-1/2"
V437 1 ProSTUD 20 (19mil) 1-5/8"
UL design no. Hourly rating ProSTUD minimum thickness
ProSTUD
minimum depth
V442 2 ProSTUD 25 (15mil) 1-5/8"
V469* 1 ProSTUD 33MIL 2-1/2"
V469 2 ProSTUD 20 (19mil) 2-1/2"
V488 1 or 2 ProSTUD 20 (19mil) 2-1/2"
V490* 1 or 2 ProSTUD 33MIL 2-1/2"
V496 1 or 2 ProSTUD 20 (19mil) 2-1/2"
V425 1 or 2 ProSTUD 20 (19mil) 2-1/2"
Hourly rating Min. stud depth (in) No. of layers and thickness of gypsum board UL U419 UL V438 UL V477 UL V489 UL V498
1 2-1/2" 1 layer, 1/2" — — —

—
1 3-5/8" 1 layer, 5/8"
    
2 1-5/8" 2 layer, 1/2"
    
2 1-5/8" 2 layer, 5/8"

—
  
2 2-1/2" 2 layer, 5/8" —

— — —
3 1-5/8" 3 layer, 1/2"
    
3 1-5/8" 3 layer, 5/8"
    
4 1-5/8" 4 layer, 1/2"
    
4 1-5/8" 4 layer, 5/8"
    
UL design no. Hourly rating ProSTUD minimum thickness
ProSTUD
minimum depth
V410 2 ProSTUD 20 (19mil) 1-5/8"
V412 2 ProSTUD 20 (19mil) 3-5/8"
V416 1 ProSTUD 20 (19mil) 3-5/8"
V417 1 ProSTUD 20 (19mil) 3-5/8"
V418 2 ProSTUD 20 (19mil) 1-5/8"
V419 2 ProSTUD 20 (19mil) 2-1/2"
V425 1 ProSTUD 20 (19mil) 2-1/2"
V435 1 ProSTUD 20 (19mil) 3-5/8"
V438 1, 2, 3 or 4 ProSTUD 25 (15mil) (See Table 1 below)
V443 4 ProSTUD 20 (19mil) 3-5/8"
V444 1 ProSTUD 20 (19mil) 3-5/8"
V448 1 ProSTUD 20 (19mil) 3-5/8"
V449 2 ProSTUD 20 (19mil) 3-5/8"
V450 1 ProSTUD 25 (15mil) 3-5/8"
V450 2 ProSTUD 25 (15mil) 2-1/2"
V452 1 or 2 ProSTUD 20 (19mil) 3-5/8"
V453* 1-1/2 ProSTUD 33MIL 6"
V461* 1 ProSTUD 33MIL 3-5/8"
V476 1 or 3 ProSTUD 20 (19mil) 3-5/8"
V477
1, 2, 3 or 4 ProSTUD 25 (15mil) (See Table 1 below)
V487 2 ProSTUD 20 (19mil) 1-5/8"
V489 1, 2, 3 or 4 ProSTUD 25 (15mil) (See Table 1 below)
V498 1, 2, 3 or 4 ProSTUD 25 (15mil) (See Table 1 below)
W411 1/2 or 1 ProSTUD 25 (15mil) 3-5/8"
W415 1 or 2 ProSTUD 20 (19mil) 2-1/2"
W424 1 ProSTUD 25 (15mil) 3-5/8"
Notes:
A
See UL listing for detailed requirements of construction of tested assembly.
* ProSTUD meets or exceeds the description of generic stud/track members listed in the UL assembly.
16