Is durock fire resistant?

This blog post will answer the question, “Is durock fire-resistant” and cover topics like the fire-resistant properties of durock and frequently asked questions related to the topic.

Is durock fire resistant?

Yes. durock is fire resistant. It does not catch fire.

Is durock fireproof?

Durock is a very efficient building material that is fireproof, non-combustible, water-resistant, and slip-resistant. As a result, durock is mostly utilized to support other critical construction components like tiles, steel or wood framework, and so on.

What is Durock?

Many people think of durock as a fancy word for a unique or distinct sort of material used in construction & building.

Durock is a building material that is often mentioned in masonry journals. However, believing them to be an unknown or distinct material is unjustified since they are common and widely utilized components in this industry.

That is to say, the word durock is nothing more than a brand name for a kind of cement backing board. They fall into the same category as all other backing boards, but with distinct brand names & unique or additional characteristics.

A cement board is mostly utilized in conjunction with other building materials rather than as a stand-alone item. They may be utilized for bedrooms, bathrooms, and tubs, as well as for the floors and walls of a home.

Durock is a cement board that is used as a wall foundation or subfloor for installing porcelain, stone, and other kinds of tiles. They may also be utilized for granite, marble, limestone, and a variety of other materials.

In other words, the primary goals of the cement boards, which have been in use for a long time, are to give strength and structure to the tiles. Durock also improves the situation before creating different kinds of foundations employing wood or metal framing.

Furthermore, individuals who prefer to keep things simple may merely utilize durock for the frame. That is to say, no additional forms of tile stacking or the presence of timber or metal framework are necessary since durock models of this sort are often utilized on their own.

Durock Board: Is it fire resistant?

When it comes to the primary subject of this essay, the fire resistance of durock boards is one of the most important characteristics that reveal their potential and uniqueness in holding a branded tag.

That is to say, the durock boards’ fire resistance is really promising. But, once again, the situation is not as straightforward as it seems. That is to say, the fire resistance of durock concrete boards varies greatly depending on the settings and scenarios.

It doesn’t imply that durock boards are combustible or that they will be destroyed rapidly if they come into touch with fire. Durock will not catch on fire, but they may be removed if the situation does not continue to favor them.

That is to say, one of the most important factors to consider when it comes to their fire resistance is the surrounding material. 

Even with the greatest level of fire resistance applied to the tiles or other framing, it is impossible to safeguard the durock if the tiles or other framing is susceptible to a high rate of flammability.

Many ceramics or marble tiles have a lower rate of flashpoints, which causes them to be flammable. And, once they catch on fire, they also cause their surroundings to catch fire, making it impossible for the durock boards to keep their promises.

Every time, the problem isn’t with the surrounding components. The demand for alterations, tailored adjustments, and variations in board thickness become combustible as well. 

That is to say, durock boards are meant to withstand fire for as long as feasible due to their heavy thickness & ideal composition. However, such elements are often obscured when making various modifications to their size and uniformity.

A 12-inch durock board or a cement backing board with a thickness of 5/8 inch may withstand a fire for up to 2 hours.

When Durock Is Burned, What Happens?

When a substance like durock is burnt in an uncontrolled manner, it might result in unfavorable outcomes.

This includes the very toxic smoke released by durock during their burning. Durock includes a sort of chemical that might be causing your eyes to burn.

The dust from the burning durocks may wreak havoc on your skin, throat, and respiratory system once again.

Durock: At What Temperature does It Burns?

There is no specified burning temp for Durock that determines its flammability or flashpoint.

The number of flashpoints an item has determines its capacity to determine the temp of burning. Because there is no such thing for the durock, we must return to their place of usage and the purpose for which they are utilized.

That is to say, we are familiar with durock as a building material whose primary purpose is to create a secure framework for homes and flats. 

They may also burn at a temp of 1500°F when approaching a house fire. It is their average combustion point, and depending on the circumstances, the temp may even escalate.

Durock, being a combustible building material, will withstand such temperatures in order to withstand a home fire. So one thing is clear: durock has a scorching point of more than 1500 degrees Fahrenheit.

Again, depending on the typical durock board, such temperatures may be tolerated for up to 2 hours. After then, depending on the circumstances, they may burn at temperatures as high as 1500°F.

What Are the Benefits, Drawbacks, and Costs of Durock?

The following is a short summary of the benefits, drawbacks, and costs of durock, the most efficient building material:


Durock is available in the most popular sizes, including 12 and 14 inches in width. They won’t break if there’s a little amount of moisture or if there’s a small amount of heat, and they can even endure the fire.


Because of the size per square foot, they are a little more difficult to lift and carry. To make the application completely waterproof, a humidity barrier is required once again.


The typical cost of adding ducks on a 120-square-foot room for 7/16th inch boards is between $115 and $175.

What Is Durock’s Melting Point?

Durock has a non-applicable melting point. That is to say, they may or may not melt, and they may or may not melt at the same temp, depending on a variety of factors.

One of the most important facts to remember about their melting is that most wall coverings, such as durock, tiles, marbles, and other similar materials, are non-combustible. That prevents them from catching fire in the first place, which is irrelevant to the melting issue.

However, the wall’s underlying components, such as varied paper-faced insulations or drywall, timber constructions, and other combustible elements, might alter the situation.

This implies that, as a result of such things, durock may spontaneously catch fire and melt at temperatures that may not even ignite them in most circumstances.

Is Durock Flammable Or Combustible?

Being combustible and flammable are two separate things that many people get mixed up about. And both of these things are inextricably linked to the artifacts’ flashpoints.

Any item with a flashpoint less than 37.8° Celsius is deemed explosive. A volatile item is one having a flashpoint of more than 37.8° Centigrade but less than 93.3° Centigrade.

Durock has a flashpoint that is neither 93.3 degrees nor 37.8 degrees. As previously stated, they are classified as non-combustible items. A non-combustible substance can never be both non-combustible and flammable at the same time.

Durock vs. HardieBacker

There are a few fundamental differences between HardieBacker and Durock boards.

  • HardieBacker is only certified for inside usage and must never be exposed to the elements. Durock may be used both inside and externally.
  • Glass mesh is included in Durock, a dependable cement product. It is the heaviest of the two substances, making it more difficult to manipulate and utilize. 
  • Durock board will become harder to cut, and installation will be more complicated. During cutting & smoothing, a particle cleaning will be required.
  • HardieBacker is a lot lighter, and it’s also the most popular cement board brand on the market. Because there is no glass in it, it is cleaner. It enables a quick and easy task with little mess. HardieBacker board comes with an EZ Grid design to help you cut accurate lines.
  • HardieBacker’s composition also includes the benefits of strength and flexibility. It is lightweight and more flexible than its competition, making installation simpler and more efficient while maintaining integrity. It also makes cleaning a lot simpler.
  • HardieBacker is also the preferred material for countertops and tiles. Durock is overly abrasive, causing vinyl, ceramic, and enamel to be damaged.
  • HardieBacker is the better option since it does not include any course materials. It comes with a guarantee that covers vinyl tile applications. Durock, however, does not.

Durock cement board features

  • Durock® is a high-strength material that resists breaking, puncturing, and distortion and may endure up to twenty years.
  • As it is a dry panel installation that does not need mixing and curing cement, it is a faster installation.
  • Traditional cement boards might take up to six times longer to install than Durock® cement boards.
  • Better Water Resistance: Durock is humidity and moisture resistant, preventing swelling, decay, mildew, and other moisture damage.
  • It is 10 times lower in weight than conventional finishing materials, with a board weight of just over 13.5kg.
  • Reduced Maintenance Costs: Durock boards’ longevity and strength imply less care and a lesser risk of severe concerns like penetration of water or cracking.
  • Increased Performance: Durock board improves the insulation of your structure, reduces external noise, and improves fire resistance.
  • Durock® cement boards feature a rough surface that makes it easier for them to adhere to finishes.
  • Durock® Basecoat offers a versatile surface that may be personalized with any color or texture.

Frequently Asked Questions(FAQs), “Is durock fire resistant?”

What is the benefit of cement board?

Because tile is installed in regions that are susceptible to water exposure, it is essential to have a backing that will not create mold and fungus or crumble after exposure to moisture. 

Cement boards perform much better than gypsum at this task due to their waterproofing.

Is concrete board a flammable substance?

No, it is not flammable. This application does not call for concrete materials. In a jet stove, if cement board breaks under typical fire conditions, it will expire in minutes. 

Your suggestion, on the other hand, may result in a great mold for packing fireclay around. It’s strong enough to endure the first fire to dry up the fireclay and won’t collapse by its own weight.

Is Backerboard a fire-resistant material?

Yes, when tested to ASTM E 136, HardieBacker Cement Board is considered non-combustible and may be used around a campfire with other non-combustible components.

What is the greatest cement board for a fireplace?

Fiber cement is a flexible backing product that may be used in a wide range of applications, including certain fireplace projects. 

This material offers excellent humidity resistance and temperature resistance, making it an excellent liner for work around your fireplace.

Is it possible to leave the cement board exposed?

It is not recommended to leave them exposed. Durock and related concrete-based products are intended for usage in wet environments. It is not waterproof, but when wet, it will not decompose or lose its strength.

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