The most common fire rated drywall is known as type X, which is 5/8 inches thick, placed on each side of 2 by 4 or 2 by 6 inch wood studs and has a minimum fire rating of 1 hour.
What thickness drywall for 1 hour fire rating?
The 5/8-inch, “fire-code” drywall (called Type X) increases a wall's fire rating to a minimum of 1 hour, from the 30-minute rating for standard ½-inch drywall. And it's not just thickness that makes the difference.
What is a 1 hour fire barrier?
According to international building code regulations, a fire barrier needs to have a minimum of a 1-hour fire rating, meaning that it can withstand heat and flames for a minimum of one hour.
How many layers of drywall do I need for 1 hour fire rating?
For Retrofit/Remodel Projects – In lieu of specific documentation for the original structure, the Building Department may accept installation of (2) layers of 5/8” Type X drywall at one side of wall, floor/ceiling, or roof assemblies to provide the required one-hour fire rating between adjacent dwelling units.
Does a 1 hour rated wall need a fire damper?
Generally, fire dampers are required where air ducts penetrate walls that are rated for 2-hours or more. They are needed in all air transfer openings (non-ducted) in rated walls, regardless of the rating.
What does fire rated mean in construction?
A fire-rated construction product is a material that is designed to slow the spread of fire and smoke through a building. Fire-rated construction products include a variety of materials, including fireproofing, concrete, insulation, and drywall.