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ASTM C 36 designates two types of gypsum board, regular and Type X. Type X gypsum board, which is typically required to achieve fire resistance ratings, is formulated by adding noncombustible fibers to the gypsum. These fibers help maintain the integrity of the core as shrinkage occurs, providing greater resistance to heat transfer during fire exposure.

To receive the "Type X" designation under ASTM C 36, a gypsum board product must be shown to achieve not less than a one-hour fire resistance rating for 5/8" board or a 3/4-hour fire resistance rating for 1/2" board applied in a single layer, nailed on each face of load-bearing wood framing members, when tested in accordance with the requirements of ASTM E 119, Methods of Fire Test of Building Constructions and Materials.

Additionally, the Gypsum Association requires 1/2" Type X gypsum board be shown to achieve a one-hour fire resistance rating when applied to a floor ceiling system, as described by GA File Number FC 5410, in GA 600, the Gypsum Association Fire Resistance Design Manual.
LiftLite™ Gypsum Wallboard

LiftLite™ is a wallboard formulated to be up to 25% lighter than standard 1/2" wallboard making it easier to lift, carry and install. LiftLite can be used on both walls and ceilings, eliminating the need for two different types of drywall and reducing jobsite waste. Like all Lafarge interior wallboards, LiftLite is GREENGUARD Certified, which can assist in the attainment of credits for LEED certification.
Advantages:

25% lighter than standard 1/2" wallboard
Easier lifting and handling for fast installation
Sag resistance
Fire resistance
Can be cost-effectively decorated numerous times
99% recycled content by weight
Less jobsite waste
Reduced transportation energy
Low VOC-emitting materials
Easy score and snap
Reduced dust


 
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