Intumescent paint and cementitious fireproofing both protect structural steel in a fire. They work in different ways, look different and suit different jobs. This guide explains the difference so you can discuss the right system with your consultant and contractor. Evora applies both systems in Dubai, Abu Dhabi and across the UAE.
Why structural steel needs fireproofing
Steel does not burn, but it weakens as it heats. Structural steel loses roughly half of its strength at around 550 to 600 degrees Celsius, and building fires can exceed those temperatures. Fireproofing slows the temperature rise so the structure keeps its strength for a rated time, commonly 30, 60, 90 or 120 minutes, giving people time to leave and firefighters time to work.
How intumescent paint works
Intumescent paint is a thin coating applied like paint. When it heats up, it swells into a thick, insulating char that shields the steel. Because the coating is thin, it keeps the shape of the steel and can be finished in a colour.
- Look: smooth, paint-like finish
- Best for: steel that stays visible, such as exposed beams and columns in showrooms, offices and atriums
- Things to check: required thickness for the fire rating, the steel section, and indoor or outdoor exposure
How cementitious fireproofing works
Cementitious fireproofing is a cement-based material sprayed onto steel and concrete. It forms a thicker, more durable layer that insulates the steel from heat.
- Look: thicker and rougher, with a spray texture
- Best for: steel that will be hidden or finished later, such as plant rooms, car parks, warehouses and industrial buildings
- Things to check: the area around the work needs protecting during spraying, and the surface must be suitable
Intumescent vs cementitious: quick comparison
| Point | Intumescent paint | Cementitious spray |
|---|---|---|
| Thickness | Thin | Thicker |
| Finish | Smooth, can be coloured | Rough spray texture |
| Typical use | Exposed steel | Concealed steel and concrete |
| Appearance matters? | Yes | Usually no |
How to choose
- Find the fire rating required for each steel element.
- Decide whether the steel will be visible.
- Check the environment: indoor, outdoor, humid or industrial.
- Ask your contractor to confirm the system, thickness and approvals before work starts.
Both systems must be applied to the thickness the product requires, and the right choice depends on your project. See all fire proofing services or contact Evora for advice. Evora is approved by Dubai Civil Defence and Abu Dhabi Civil Defence.
Read more: structural steel fireproofing, passive fire protection companies in the UAE, intumescent paint for steel, cementitious fire proofing. Call or WhatsApp +971 52 6700 119.