How to Make Wood Fireproof? [Answered Properly]

Normally wood is used to build furniture and handicrafts. If the question runs through your mind, regarding fireproof wood while purchasing kitchen cabinets. Then it is really a practical and valid question.

So, you want to know how to fireproof wood?

Wood can be fireproofed by chemically softening, treating, and compressing it. This process fills the spaces between the cell walls with fire-resistant wood chemicals and seals them shut. Because certain types of wood are utilized as structural materials.

Also, wooden structures are always vulnerable to fire. While there are ways to make wood almost totally fireproof, the majority of them require expensive materials or techniques that require specific ingredients. 

Fortunately, you can also prepare a simple fire-retardant spray or paint-on combination at home using readily available ingredients. While this will not completely protect the wood from fire, it will provide enough resistance to allow you to swiftly put out any blaze. 

Why Should You Fireproof Wood?

When you fireproof wood, it’ll prevent rot and decay while also preventing the spread of flames and smoke. The wood is treated with chemicals to enable the fireproof capabilities to reach all portions of the wood. Also, fireproofing wood is valuable to protect people from fire incidents. 

Thousands of people are killed every year as a result of fires incidents. So, choosing fireproof wood can help to mitigate the consequences of these tragedies.

If you own or work for a construction firm, you should bear this in mind when constructing structures in high-density regions. If fire-retardant wood is utilized in the interiors, the overall building safety will improve dramatically.

Even the quality criteria for building safety will be reached and the required certificates will be issued by the local authorities shortly. This will also boost the selling and release value of your construction project.

Things to Consider Before Fireproofing Wood

You must have to consider the thickness of the wood to make the wood fireproof. To some extent, the thickness has an impact on the fire reaction. Solid wood with a thickness of 18 mm is classed as M3.

And, M4 is below this thickness. Impregnation should be done mostly by soaking or in a vacuum and pressure autoclave where the format enables it.

Other than that, the wood must be untreated, with no varnish, stain, or paint applied.

Fireproofing Wood: Complete Guide

Coating wood with a fire-resistant coating is the simplest and fastest technique to make the wood fireproof. You may purchase the coating or create it yourself at home.

After applying the coating to the wood with a brush and uniformly dispersing the primer across the surface, your wood will become fireproof after drying.

A protective char coating forms on the outside of the wood in the case of a fire. The ingredients that result are used to make this layer. This lessens the intensity with which the wood burns and the spread of the fire.

Steps for Commercial Purpose

Fire-retardant technology does not try to treat wood with a band-aid method. It guarantees that the wood is treated thoroughly. Rather than just being coated with a fire-retardant chemical on the outside. 

These wooden blocks are put to the test to see how long they will last and how well they will keep paint in everyday conditions. This type of wood is gaining popularity since it is safe to use in industries where fires are prevalent. They are also safe for homes and save money on insurance.

1. Kiln Dried Wood

The wood must be kiln-dried at first. Then the process of transforming the wood into fireproof wood can begin. The wood is then treated with a fireproof chemical. The majority of these substances are unique and each treatment facility has its own formula.

Every fire-retardant wood is made utilizing a pressure procedure to ensure that the wood is properly infused with fire-resistant chemicals. Fire-safety authorities will not accept wood that has simply been treated on the surface.

2. Processing in Retort Chambers

The wood is treated in the retort chamber after it has been kiln-dried to ensure that the required pressure can be produced to treat the wood. The retort chamber is shut once it has been loaded with kiln-dried wood.

By eliminating all of the air trapped inside the retort chamber, a vacuum is generated.

Also, when the chamber is completely devoid of air, it is filled with flame-retardant chemicals. The pressure control mechanism is then utilized to ensure that all of the wood is treated with the fire-retardant chemical. 

The type of wood, thickness, moisture level, and other factors all influence the amount of pressure required. The length of pressure treatment varies according to the type of wood.

3. Quality Control Checks

The wood is ready after being exposed to retort chambers and being kiln-treated. It’s critical to ensure that this wood passes quality assurance testing. After internal quality checks of samples from each slot are finished, this wood is suitable for final usage.

The quality control team looks for fire-retardant levels in the wood to make sure it’s safe to use or not. They also need to check and keep an eye on the burn rate of the wood.

This test will fail if they find any wood that is easily flammable. The spread of a fire should be slowed by this fireproof wood.

During quality control inspections, the depth of charring is also evaluated. Charring should be of varying percentages under defined burn conditions.

Steps That Are Easier To Do At Home

These steps can be taken by anyone at home. It is the easiest way to wood fireproof.

  • First, you have to take a bucket with 2 quarters of water.
  • Second, combine 1/2 cup zinc chloride, 1/4 cup ferric chloride, 3 teaspoons of boric acid, and 3 tablespoons of ammonium phosphate in a mixing bowl.
  • Finally, after mixing the components perfectly, wear nitrile gloves. Then apply three coats of this mixture to your wood or wooden furniture. After mixing, artifacts make them fireproof to an extent.

These components you can purchase at any chemical supply store that provides cleaning and maintenance supplies for the household.


Is pressure-treated wood resistant to fire?

No, standard pressure-treated wood is designed to be used in external applications and even in water.

When it comes to fire-resistant wood, how long does it last?

The retardant’s unopened canisters will endure for many years. Many products, such as Contego high solids fire retardant paint/primer for steel, claim to have no shelf life limits.

What is the distinction between pressure-treated and fire-resistant wood?

Plywood that has been pressure-treated can be fire-resistant. Some individuals wrongly assume that all pressure-treated plywood is inherently fire-retardant since fire-retardant plywood also goes through a pressure treatment procedure. When exposed to a flame, fire-retardant wood creates a noncombustible gas and water.


Now that you know how to fireproof wood, you’ll be extra cautious while purchasing furniture. Many store owners will try to market partially treated wood as fire-resistant wood, which you already know isn’t very good at putting out a huge fire. As a result, it’s usually a good idea to use fully treated fire-retardant wood for your kitchen cabinets and cupboards.

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