Tagged With "Stud"

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Re: Metal Stud Fire Walls

Ivan J. Humberson, P.E. ·
As a rule of thumb, it is generally accepted that constructing a fire resistant rated assembly with materials that are heavier, or providing the members at a smaller spacing than that specified in the assembly description will meet or exceed the assembly rating. As described, the change from 25-guage to 16-guage studs, spaced at 16 inches on center instead of 24 inches on center would definitely give the assembly more mass. The added mass would then equate to a lower rate of heat transfer,...
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Re: Metal Stud Fire Walls

Slammer ·
A few points: 25 gage studs are typically used for interior non-bearing conditions and generally should be installed with a gap between the end of the studs and the track. Neither the studs or the gypsum board should be fastened to the top track (this is permitted in fire rated walls by the Gypsum Association). This will provide for expansion as well as movement by the surrounding construction such as deflection. This will mitigate some of the expansion. I could not find reliable data on the...
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Re: Metal Stud Fire Walls

John ·
The following was copied from an article in, Nov/Dec 2013, Commercial Building Products. Passive Fire Protection Safeguards Building; by Gregg Stahl, Clark Dietrich Building Systems Fire-rated-wall requirements "Walls (load bearing or not), floors, and ceilings can serve as fire barriers so long as they have a fire rating. Fire barriers are tested to the requirements of American Society of Testing and Materials (ASTM). West Conshohocken, PA, E119 (ANSI/UL263) and rated to resist the spread...
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Re: Metal Stud Fire Walls

Slammer ·
Harmathy's 10th rule states I would expect that a heavier gage stud is more fire resistant.
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Re: Metal Stud Fire Walls

Pinigis ·
check your math. A rise to 1600 degrees creates a 1% thermal expansion in steel.
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Re: Metal Stud Fire Walls

John ·
Hi Pinigis Are you sure the thermal expansion of steel at 1800 degrees is 1%? In the spectrum of size, gauges and spacing of metal studs, the manufacturers have established the lightest configuration that will pass ASTM-E119. They should be required to establish the configuration with the heaviest gauge stud with the shortest stud spacing.
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Metal Stud Fire Walls

John ·
Why do we allow a wall to be classified as firewalls when it is significantly different from the tested configuration? Typical, Metal Stud Assembly Description "1-1/4 in. wide by min 3-5/8 in. deep fabricated from min 0.020 in. (25-gauge) thick galv steel, attached to floor and ceiling with fasteners spaced 24 in. OC max." (With 5/8 Type X gypsum wallboard both sides etc.)   At the 1800-degree temperature attained during ASTM-E119, Thermal Expansion causes metal stud to expand 1/4 inch per...
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