The safety of any structure depends on its ability to resist and withstand fire. That’s why fire protection is an essential element in building construction. Fire protection includes using materials and techniques to prevent or delay fire damage in case of an outbreak. One of the popular fire protection methods is the application of protective coatings such as fire-retardant and intumescent paints. However, most people need clarification on the two since they offer various forms of fire protection. This blog post will explore the differences between intumescent paint and fire-retardant paint.
Composition: Intumescent paint uses compounds such as graphite, soda ash, and fire retardant substances like ammonium phosphate, which expand up to 50 times when exposed to heat. As the paint reacts to the heat, it swells to form a layer of charred insulation that protects the surface beneath from excessive heat. On the other hand, fire-retardant paint contains chemicals that enhance the flame resistance of the surface but don’t expand when exposed to fire and do not contribute to the overall fire resistance of an assembly.
Applicability: Intumescent paint is suitable for various substrates, including structural steelwork, timber, spray foam, wood and plasterboard surfaces. It is most commonly used where fire protection is a primary concern. Most building codes and regulations stipulate that only intumescent coatings can be used for fireproofing structural steel because they let them withstand fires for up to two hours or more. Fire-retardant paint can be used on decorative surfaces such as walls, ceilings, and doors, but it is less effective in preserving the core structure’s integrity than intumescent paint.
Performance: Intumescent paint expands when exposed to heat, forming a thick and carbonaceous layer that thermal insulation makes the underlying material safer from heat and flames. The thickness of the coating will reduce the steel’s temperature and help keep the steel structure stable for extended periods, reducing the risk of collapse. The fire-retardant paint can’t provide the same level of protection, even though it helps to slow down the spread of fire, giving more time to evacuate the building. They tend to burn away, but applying retardant also helps lower the flames, slow down heat distribution, and reduce smoke inhalation.
Cost: Intumescent paint is typically more costly than fire-retardant because it’s a specialized application requiring extra labour, materials, and fire-retardant properties. Further, the coated structure will require multiple coats of intumescent paint with thicker layers, increasing labour and material costs. Retardant colours are less costly but much less effective in severe fire scenarios.
Maintenance: Intumescent paint requires regular checks and maintenance, and it could weaken with time and exposure to UV light. Professional inspections should be done on a regular basis, and the paint might need to be reapplied every ten years. Fire-retardant coatings require levels of inspection and maintenance similar to standard coatings.
Fire retardant paint and intumescent paint serve different purposes regarding fire protection. Intumescent coating is more expensive but provides more significant protection for the building’s infrastructure. In contrast, the primary function of the fire-retardant layer is to slow down the spread of fire and protect decorative surfaces. Ultimately, the choice between the two paint types should be based on the structure’s safety requirements and the local building codes and regulations. Fire protection is essential in ensuring public safety regarding buildings and structures that house general or dangerous chemicals.