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2 hr wall, limiting heights?

O

ovdrywall

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Joined
Mar 18, 2014
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Location
United States
Hi guys, I'm looking for a table that shows the limiting heights for 2 hr fire rated wall, this is a interior partition, composite, 34' 8" avg. height, non-braced, with 2 layers of 5/8" type X fire code gypsum board on each side of the wall.

I found that 600S125-43 (33KSI) studs @ 16"OC, will meet the required height for 1hr assembly UL-419, which states that 1 layer of 5/8" gyp board on each side shall be used to meet rating.

I'm assuming that using and additional layer of gyp. on each side will make the structure stronger and the limiting height even higher, but I can't find any table of limiting heights for this type of wall that prove I'm correct of definitely wrong.

Does anyone here have build a similar wall, or know where I can find more information regarding the metal members I need to use to comply?

for your time, thanks in advance !

Oscar
 
Welcome

What are you using the two hour wall for?

How high are you trying to go?

How did you find us?

what state are you in??
 
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Refer to ASTM C 754. It includes a table that indicates the maximum height for a metal stud wall based on stud spacing, applied lateral load (5 psf is code minimum, but the table goes up to 10 psf), and depth of stud. The minimum base metal thickness of studs used for the table is 0.0179 in., which is the minimum specified for many of the tested wall assemblies. Although the table states that it is based on a single layer of 1/2-inch gypsum board on each side, installed vertically, the table's footnotes indicate that the maximum heights in the standard are applicable regardless of gypsum board thickness or number of layers. The footnotes also state that the table is based on acceptance criteria published by ICC-ES.
 
Phil, good point. The tables go up to 33'-9", which is 11" short of what is required.
 
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