Is uPVC cladding fire resistant?

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

Is uPVC cladding fire resistant?

No, uPVC cladding is not fire-resistant. It is flammable.

What Exactly Is uPVC?

Unplasticized polyvinyl chloride, sometimes known as uPVC, is a kind of plastic that is frequently used in doors and windows. Due to its stiffness and lack of flexibility, it is also known as rigid PVC. 

uPVC doors and windows have gained popularity among homeowners over time. This is so that uPVC windows and doors may survive for a long time since the material is resistant to water, rust, mold, & pollution. 

Along with this, uPVC windows may provide your contemporary properties, whether they are your house or workplace, with an aesthetically pleasing and minimalist aspect.

Is cladding made of uPVC flammable?

The majority of PVC/uPVC or vinyl cladding materials have a fire rating of C or D, which indicates that they are flammable. 

PVC cladding will melt and burn when subjected to heat, even if the spread of the flames over the surface of uPVC may be limited depending on the backing.

Does PVC cladding have fire resistance?

When exposed to fire, the PVC material does have a tendency to scorch and there is a potential that it might crumble away, but it does not let much flame spread throughout the surface. 

In the case of a fire, adequate attention should be given to combustible elements underneath the cladding that may not be fire-resistant.

What happens when PVC burns?

PVC emits carbon monoxide, dioxins, & chlorinated furans when burnt. A yellow smoke cloud and varied concentrations of hydrogen cyanide & phosgene are produced when these materials are burnt. 

Death may result after a 30- to 60-minute exposure to high hydrogen gas concentrations.

Fire Rating for uPVC Cladding

The typical fire rating for uPVC/PVC cladding is a Euroclass C or D, indicating that it is flammable. A little contribution to fire is indicated by C, while a considerable contribution is indicated by D. Comparatively speaking, untreated wood cladding has a class D fire rating.

Chlorine & ethylene from natural gas makes up uPVC. Synthetic polymers, a kind of plastic, are created from these basic components.

When the cladding comes into touch with fire, the plastic composition of the material will cause it to bend and melt. uPVC panels may inhibit the spread of flames, however, when exposed to fire, they have a tendency to burn and crumble.

Additionally, burning polymers releases harmful dioxins, which are exceedingly dangerous for both the environment and people.

Does cladding resist fire?

In recent years, there has been a lot of discussion about safety precautions and cladding. In light of previous tragedies, people may be less confident in the safety of cladding as a result of increased anxiety about the fire dangers linked with it.

It’s crucial to keep in mind that there are several distinct types of cladding, each with unique qualities and some of which are fire resistant and others which are not. 

The different cladding types are broken out here along with their capacity for heat resistance.

  • Wood cladding
  • Glass Cladding
  • uPVC Cladding
  • Stone Cladding
  • Cement Fiber Cladding
  • Aluminum Cladding

I will now elaborate on the guidance given above.

Wood cladding

For its insulating qualities, wood cladding employs a natural substance. As it is available in a variety of colors, styles, & textures that may give a building a more appealing look, it is frequently utilized for aesthetic reasons. 

Timber is a resource that is renewable, has a minimal carbon impact, and can be recycled after its useful life. Additionally, it is strong and offers superior thermal and acoustic insulation for homes.

Despite the fact that the Grenfell Tower accident did not include any lumber, questions have been raised about the security of all types of flammable cladding materials, including wood. 

Legislation has not yet been altered, however, to increase fire safety, the wood cladding may need to be coated with a proper fire-retardant substance.

Glass Cladding

To produce a recognizable appearance, many major structures use glass cladding. Glass cladding may be molded into a wide variety of distinctive designs to match every curve of a structure since it is lightweight. 

It just needs the occasional clean; it does not degrade or change color. It maximizes the quantity of natural light in a structure and can survive the harsh weather in the UK.

More advanced cladding materials now offer better fire resistance because of advancements in the glass.

uPVC Cladding

Due to its cheap cost and little maintenance requirements, uPVC is a common material option for buildings. 

This kind of cladding is waterproof and corrosive resistant, and it incorporates UV stabilizers that stop the covered area from being exposed to direct sunlight. It is a wonderful option for outside cladding since it keeps a structure cool in the summer and warm in the winter.

uPVC cladding is flammable in a fire because the panels will stretch & melt, but the flames won’t travel very far.

Stone Cladding

Stone cladding is the process of cladding a structure with thin layers of natural stone on the outside. Slate, marble, and sandstone are typical stones utilized in this type of cladding. 

Installation is simple since stone is easily cut into slabs of consistent thickness. They create an excellent exterior cladding system because of their non-porous surface, which prevents them from absorbing moisture.

Even though stone doesn’t burn, it may still be a fire hazard since it can break or fracture when exposed to a fire’s extreme heat.

Cement Fiber Cladding

A composite substance called fiber cement is utilized both inside and externally on a structure. It is created by combining two or more ingredients to create a new substance; commonly, cement, sand, filler, and cellulose are used as the constituents. 

Due to its endurance and resistance against bad weather, fiber cement cladding is popular. It is lightweight, simple to install, and unaffected by extreme heat or dampness.

In terms of fire protection, fiber cement is a non-combustible substance; thus, in the case of a fire, it won’t ignite or feed flames.

Aluminum Cladding

Metal cladding, which is often constructed of steel or aluminum, is great for commercial or industrial structures. It is hard to destroy since it is lightweight, affordable, and strong. 

It keeps a structure warm and insulated while providing high weather resistance. It’s a terrific option for a range of requirements since there are many various designs and colors to pick from.

As a non-combustible material that won’t aid in the spread of flames during a fire, metal cladding is also very fire resistant.

Are uPVC windows fire-resistant?

According to experiments on fire, uPVC is inherently flame-resistant and won’t start, sustain, or promote the growth of a fire. As a result, you may install uPVC windows in your house or place of business with confidence knowing that they won’t hasten the spread of flames in the case of a fire accident. 

This is so that the PVC may operate as a flame retardant due to its chlorine concentration. The main escape routes from a fire mishap are often windows and doors. Because of this, it is advisable to use a material for your doors and windows that is tough and low-flammable, like uPVC.

Additionally, in the case of a fire, uPVC windows do not melt. uPVC windows really self-extinguish after the source of fire is removed because they cease burning. 

They are a safe material to include in your home and may be used for windows and doors since they do not promote the growth of fire and are self-extinguishing.

Advantages of uPVC

uPVC doors and windows have a variety of additional advantages in addition to being fire-resistant, which instantly raises the safety level of your house. Some of them are listed below:

  • Easy to maintain
  • Durability
  • Security

I will now elaborate on the guidance given above.

Easy to maintain

uPVC doors and windows need extremely minimal upkeep compared to other materials, which need to be varnished or painted every year. They may easily persist for decades without deteriorating or losing their aesthetic charm. 

They often simply need a short wash in soapy water and a short wipe-down with a clean cloth to remove dust and debris and avoid stains.


Installing windows and doors made of uPVC has several advantages, one of which is the material’s extreme durability. Extreme elements like wetness, changing weather, and other factors may be pleasantly withstood. 

uPVC is also resistant to decay, which is advantageous, particularly for homes close to the ocean where a high salt content might cause issues. Additionally resistant to corrosion and termites are uPVC windows and doors. 

Additionally, uPVC windows and doors can withstand damaging UV rays, preventing the material from fading from extended sun exposure. As a result, they may endure for years without losing their finish or color.


Making the right window or door installation is essential for your property’s security, which is why it is so important.

The frames of uPVC windows and doors are strong and include single or multi-point locking mechanisms that provide increased security. 

They are additionally reinforced with galvanized steel, which makes them incredibly hard to break. You won’t need to be concerned about intruders or robbers entering your home if you have uPVC windows and doors.

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

Which wood is most resistant to fire?

The Ironwood/hardwood species is regarded as having the greatest degree of heat resistance in its natural state.

Azobe wood, a kind of ironwood, has a longer ignition period and is regarded as the wood with the highest heat resistance because of this.

What is a coating that resists fire?

In big industrial areas, public buildings, or on new construction, fire retardant paints are most usually employed to offer fire resistance.

They may also be used for minor do-it-yourself projects, but not for jobs like painting BBQs and exhaust pipes, which only need paint that is heat resistant.

How can wood be made resistant to fire?

  • Put 2 quarts of water in a bucket.
  • Add 3 tbsp. of each boric acid & ammonium phosphate to the water, along with 1/2 cup each of zinc chloride and ferric chloride.
  • Thoroughly combine the ingredients. To protect your wood against fire, paint or spray it with the mixture two to three times.

What is a substance that is fire resistant?

A material that is fire resistant is one that is made to endure heat and avoid burning. A material used in the bunker gear worn by firemen to shield them from the flames of a burning structure is an example of one that is fire-resistant.

Is fire retardant paint worth it?

Particularly when it comes to residential structures, fire retardant paint is essential since it gives occupants more time to flee a burning structure. Intumescent paint is sometimes confused with fire retardant paint.

Are dwellings made of concrete fireproof?

Concrete can resist temperatures of up to 4,000 degrees, which are frequent in home fires. A house’s contents are still combustible, but concrete is not. An electrical fire cannot possibly be hidden within a concrete wall.

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