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Type X fire rated gypsum drywall that is 5/8 -inch (15.9mm) thick and installed on each side of nominal 2-inch x 4-inch (38x89mm) wood studs spaced 16-inch (400mm) o.c. or 3-5/8 inch (610 mm) steel studs spaced 24” o.c. has a minimum fire rating for the assembly of 1 hour, which is a typical requirement for many.
Is all gypsum board fire rated?
All gypsum panels are fire resistant and produced in a range of thicknesses, core formulations and optional special performance enhancements.
How do I know if my drywall is fire rated?
Type X drywall products will have a UL/ULC Marking printed on the back of each board identifying it as a fire-resistance rated board.
What type of gypsum board is used to achieve a fire rating?
Type X gypsum board is defined by ASTM C1396 and generally requires a fire-resistance rating of not less than one hour for 5⁄8” thick boards or 45 minutes for ½” boards.
Is gypsum board flammable?
Gypsum is a soft mineral that by itself is not flammable. Type X designated gypsum boards meet the American Society for Testing and Materials (ASTM) guideline that 5/8-inch sheets applied in a single layer to both sides of standard wood framing will resist penetration by fire for at least an hour.
What’s the fire rating on 5/8 drywall?
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. Type X has a denser core and contains glass fibers that keep it from crumbling in the heat.
How many layers of gypsum are needed for a 2 hour rating?
As 2 hours of fire protection has become the standard for fire safety in America, it has become somewhat of a standard practice to include two layers of type X drywall within a building’s perimeter in order to achieve this required level of fire safety.
How much does a 12 sheet of 5/8 drywall weight?
Using lbs/ft2 calculations for 48” wide sheets Lbs/ft 2 12 ft long 1/2” Standard 1.6 76.8 5/8” Standard 2.2 105.6 1/2” Lightweight 1.25 70 5/8” Lightweight 1.65 92.4.
What is a 1 hour rated wall?
According to the Engineered Wood Association, a one-hour rating indicates that a wall constructed in a manner similar to the one tested will contain flames and high temperatures, and support its full load, for at least one hour after the fire begins.
What is the fire rating on Type C drywall?
Type C drywall is known as the more durable version of Type X—there are more glass fibers in this product as well as more vermiculite components, giving it a fire resistance of 2-4 hours. You can find this product at your local drywall and insulation store in 1/2” and 5/8” thickness.
Why does gypsum have excellent fire resistance characteristics?
Gypsum Board is an Effective Fire Barrier Because steam will not exceed 212 degrees F under normal atmospheric pressure, it very effectively retards the transfer of heat and the spread of fire.
What is the difference between gypsum board and sheetrock?
Gypsum Board vs. Drywall is made up of gypsum. Sheetrock is the brand name for drywall. Those who say “gypsum wallboard” or “Sheetrock” are referring to the same thing.
Why is gypsum fire resistant?
Gypsum is approximately 21 percent by weight chemically combined water which greatly contributes to its effectiveness as a fire resistive barrier. When gypsum drywall is exposed to fire, the water is slowly released as steam, effectively retarding heat transmission.
Does gypsum catch fire?
#1: Offers fire protection One of those advantages is the heat-resistant property of this material. It has a noncombustible core that contains chemically combined water (in calcium sulfate). Even after the water is gone, the gypsum board continues to resist heat.
What are the disadvantages of gypsum board?
Advantages of gypsum board include low cost, ease of installation and finishing, fire resistance, sound control, and availability. Disadvantages include difficulty in curved surface application and low durability when subject to damage from impact or abrasion.
Is gypsum board harmful to humans?
To answer your question in short: drywall dust is not toxic to the body in smaller amounts. This means it will not cause any long-term diseases. However, it can irritate parts of the body, like the eyes and throat. This is because it is made of a chemical known as gypsum (calcium sulfate dihydrate).
When should you use 5/8 drywall?
5/8-Inch-Thick Drywall These panels are commonly used for ceilings or for walls that require a prescribed fire-resistant rating.
Do you need 5/8 drywall in garage?
6 Dwelling/garage fire separation: The wall between a house and garage must be separated by 1/2″ drywall. If there are habitable rooms above the garage, 5/8″ type X (fire-rated) drywall must be used at the ceiling.
What is a 2 hour rated wall?
2. Gypsum Board: Two (2) hour rated walls have two (2) layers of 5/8″ Type ‘X’ gypsum wallboard panels on each side of the steel studs. The “Fire Tape” product would be used as an alternative to conventional joint tape in specific systems when: 3.
Does 2 layers of plasterboard fire rating?
Single layer 15mm Gyproc FireLine each side of Gypframe 48 S 50 studs provides 60 minutes. Double layer 15mm Gyproc WallBoard each side of Gypframe 48 S 50 studs provides 90 minutes. Double layer 12.5mm Gyproc FireLine each side of Gypframe 48 S 50 studs provides 120 minutes.
How many layers of drywall do I need for 1 hour rating?
Double the number of Type X sheets on the wall for a simple system installed over fire-resistant fiberglass insulation; each sheet of 5/8-inch Type X drywall is rated to resist fire for one hour, so two layers will produce a two-hour firewall.
How do you get 1 hour fire rating?
More specifically, if a wall is constructed in a manner that closely resembles a tested wall which has shown to contain flames and high temperature for one hour, it is eligible to receive a 1-hour rating.
What does a 4×8 5/8 sheetrock weigh?
A 4 x 8-foot sheet of standard 5/8-inch thick drywall weighs 74 pounds, and a 23 percent reduction in weight offered by ultralight can be significant.
What does 5/8 sheetrock weigh?
A 5/8″ sheet of drywall, which is used to achieve fire ratings, typically weighs a little over 70 pounds. Also, depending on their dimensions, special types of drywall including moisture resistant products are often even heavier. Four by twelve feet panels can weigh as much as 125 pounds!.
How much does a sheet of 5/8 plywood weigh?
Table of materials Material Unit weight Masonry Walls 1/2 inch 2.08 ppsf (66.56 pounds per 4×8 sheet) 5/8 inch 2.60 ppsf (83.2 pounds per 4×8 sheet) Plywood.
