Is UHPC non-combustible?

Many UHPC products are classified as non-combustible or of very limited combustibility, but it depends on the specific mix and any fibres or sealers. Request the classification report.

Can UHPC be used on high-rise facades?

UHPC panels are used on tall buildings, but suitability depends on the product's classification, the whole wall system and local regulations. Involve a fire engineer early.

Do sealers affect fire classification?

They can, because some sealers contain organic content. Check whether the classification report covers the sealed product.

UHPC tiles and fire performance

Fire performance is a critical question for any facade or interior lining. UHPC is a mineral, cement-based material, which is a good starting point — but the classification of a specific product, and of the whole wall system, is what counts.

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Why UHPC generally performs well

Cement-based products do not burn and contribute little or no fuel to a fire. Many UHPC tile and panel products achieve the highest reaction-to-fire classes (for example A1 or A2 under the European EN 13501-1 system).

However, some mixes contain synthetic fibres, pigments or sealers with small organic content, and the classification can depend on these. That is why you should always check the evidence for the exact product.

European reaction-to-fire classes (EN 13501-1), simplified
Class	Meaning in brief
A1	Non-combustible: no contribution to fire
A2	Limited combustibility: very limited contribution
B	Combustible: very limited contribution to fire growth
C–F	Increasing contribution to fire growth

Simplified overview. Smoke (s) and droplet (d) sub-classes also apply to A2–D. Requirements vary by country and building type.

Reaction to fire vs fire resistance

Reaction to fire: how much a material contributes to the growth of a fire (e.g. Euroclass A1, A2, B…)
Fire resistance: how long an element maintains its function in a fire (e.g. 60 or 120 minutes) — usually a property of the whole wall or floor build-up, not the tile alone

Facades: think system, not just panel

In a rainscreen facade the panel is one part of a system that includes the subframe, insulation, membranes and cavity barriers. Regulations in many countries set requirements for the materials in external walls of certain building types and heights. Work with your fire engineer and confirm requirements in your jurisdiction.

Evidence to request

Reaction-to-fire classification report for the exact product and thickness
Details of any fibres, sealers or coatings included in the classification
System test reports where relevant to your market
Declaration of performance or equivalent product documentation

Spalling

Dense concretes can spall (shed surface fragments) under rapid heating as moisture turns to steam. Some UHPC mixes include polypropylene fibres that melt in a fire and create escape paths for steam, reducing spalling risk. For non-structural tiles and cladding this is mainly a durability-after-fire question, but ask manufacturers how their product behaves.

Regulations differ by country

Many jurisdictions restrict combustible materials in the external walls of residential and high-rise buildings, and set requirements for cavity barriers, insulation and membranes. Requirements and terminology differ between countries, so always check current local regulations with a qualified fire engineer rather than relying on general guidance.

Interiors

For interior wall and ceiling linings, reaction-to-fire requirements depend on room use and escape routes. UHPC's mineral nature helps, but sealers and adhesives should also be considered in the overall assessment.

Frequently asked questions

Is UHPC non-combustible?: Many UHPC products are classified as non-combustible or of very limited combustibility, but it depends on the specific mix and any fibres or sealers. Request the classification report.
Can UHPC be used on high-rise facades?: UHPC panels are used on tall buildings, but suitability depends on the product's classification, the whole wall system and local regulations. Involve a fire engineer early.
Do sealers affect fire classification?: They can, because some sealers contain organic content. Check whether the classification report covers the sealed product.