Sustainable Construction - Building & Construction Authority

Intumescent Paint
A Guide Fire on Protection Fire Protection and Performance-based and Performance-based Fire Engineering Fire Engineering
Generally intumescent paints are applied in three layers – primer, intumescent layer and the
finishing coat.
The thickness of the intumescent layers depends on:
(a) steel size
(b) steel type
(c) steel section used as column
or beam
(d) fire rating required (e.g. 60
minutes or 120 minute)
(e) exposure (2, 3 or 4-sided)
and so on.
Do bigger steel sections require thicker coat of
intumescent paint?
For the same level of fire resistance requirement, a
bigger steel section will require a thinner intumescent
paint coating as compared to a smaller section.
• 4th coat: Finishing Coat
• 3rd coat: Finishing Coat
• 2nd coat: Intumescent Layer
• 1st coat: Primer Coat
• Steel Surface
55