January 2016

Metal Stud Fire Walls

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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