What is the fire rating of 1/2 inch drywall?


Most Type X drywall has a one-hour fire rating. The fire rating for the 1/2-inch drywall used throughout the rest of the home is 30 minutes. As an added benefit, Type X drywall absorbs sound slightly better and is slightly stronger than conventional 3/8-inch or 1/2-inch drywall.

How many layers of drywall do I need for 1 hour fire rating?

Typically one layer of Type X drywall promises 45 minutes to one hour of fire protection for the building constructed with this type of material.

Can you put 2 layers of drywall?

Double or multiple layers of drywall are sometimes required for increased fire resistance or for reduced sound penetration. You can secure all layers with fasteners in the standard manner, but a good alternative is to use adhesive to attach the outermost, or “face,” layer.

What is the fire rating for 5/8 drywall?

1 hour

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 makes a 2 hour fire rated wall?

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.

What makes a 1 hour fire rated wall?

Ratings for fire resistance are given in accordance to the time a structure can contain a simulation fire. 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 is the fire rating of 1/2 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.

How thick is 2-hour fireproofing?

3 ¼ in.

The construction is type 1B as defined by the International Building Code IBC [3] and the floor system is required to have a 2-hour fire resistance rating. A 2-hour restrained assembly rating can be achieved with a 3 ¼ in. light- weight concrete thickness over 2 in.

Are all 5/8 gypsum board fire rated?

Type X drywall has special core additives that allow it to be used in fire rated designs and usually comes in 5/8” thickness. 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 kind of drywall do you use around a fireplace?

Drywall Type X

Fire-rated Drywall Type X

It slows down the passage of fire rather than stops passage completely. The drywall has a total thickness of 5/8 inches and is reinforced with glass fibers to help it retard fire.

Is half inch or 5/8 drywall better?

Quote from Youtube video: Half inch sheetrock is what you see in most homes on the walls. And probably the last five to ten years we've started using 5/8 sheetrock on the ceilings. It gives a much stiffer.

Can you use 1/2 inch drywall ceiling?

1/2-Inch-Thick Drywall

Half-inch drywall panels are the standard thickness for interior walls, as well as ceilings. These panels are easy to carry and hang.

Where do you put 1/2 inch drywall?

1/2-inch drywall is the most common drywall thickness. You can use this type of drywall for the vast majority of projects, including on walls and ceilings, although it’s a little too thick for most curved walls.

Which is better drywall or sheetrock?

No, there is no difference between Sheetrock and drywall. Sheetrock would likely be the standard for what drywall should be. If you see in a tutorial that you should use Sheetrock, you can use any type of drywall available to you. Whether the drywall will be as high quality as Sheetrock is a different question.

What thickness drywall should I use?

1/2-inch drywall is the most versatile board and the most common thickness for the 16-inch on-center interior walls in most homes. It offers a good balance between strength and weight. 5/8-inch drywall is a heavier product that resists sagging in ceilings and in 24-inch on-center interior walls.

What is purple drywall?

National Gypsum has developed Purple drywall that is moisture, mold, and mildew resistant. This means less water and mold damage in homes keeping construction debris from landfills. In addition, within the line of Purple drywall products, are sheets that stand up to abuse and impact.

What’s the difference between drywall and gypsum board?

Gypsum is a mineral containing water while drywall consists of gypsum plaster, which contains no water, pressed between two thick paper panels. 3. Gypsum in its natural form is crystalline whereas drywall is not since the plaster is in paste form.

Is gypsum board fire rated?

Fire-rated gypsum board is a form of drywall that helps prevent the spread of flames across a home or business. Gypsum is approximately 21% chemically combined water, which greatly contributes to its effectiveness as a fire-resistive barrier.

Does gypsum board reduce heat?

Gypsum board is the most commonly used material for false ceilings due to its many benefits. 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).