What can occur to light weight steel construction when exposed to heavy heat?

What can occur to light weight steel construction when exposed to heavy heat?

• A. Heat causes the studs to warp or twist and can pull the screws out of the drywall, resulting in horizontal fire spread.
• B. Heat causes the studs to warp or twist but does not affect drywall.
• C. Heat has no effect on light weight steel construction.
• D. Heat causes the drywall to shrink while the studs remain straight.

Answer: (A)

When lightweight steel framing is exposed to heavy heat, the metal framing and its fasteners react in a way that compromises the wall’s fire barrier. Steel expands with heat and can lose stiffness, so studs may warp or twist. As the studs move, the screws that hold the drywall can loosen or be pulled out. That combination—the deformation of the studs and the failure of fasteners—allows the drywall to detach at joints and along screw lines, creating gaps in the wall. Those gaps provide a path for flames and hot gases to travel horizontally through the wall cavity, letting the fire spread across rooms or into adjacent spaces. So the main danger is the deformation and fastener failure that break the integrity of the wall, not the drywall remaining perfectly intact or the drywall shrinking while the studs stay straight.

When lightweight steel framing is exposed to heavy heat, the metal framing and its fasteners react in a way that compromises the wall’s fire barrier. Steel expands with heat and can lose stiffness, so studs may warp or twist. As the studs move, the screws that hold the drywall can loosen or be pulled out. That combination—the deformation of the studs and the failure of fasteners—allows the drywall to detach at joints and along screw lines, creating gaps in the wall.

Those gaps provide a path for flames and hot gases to travel horizontally through the wall cavity, letting the fire spread across rooms or into adjacent spaces. So the main danger is the deformation and fastener failure that break the integrity of the wall, not the drywall remaining perfectly intact or the drywall shrinking while the studs stay straight.