Intumescent Coatings for Structural Steel: UK Specification Guide

Intumescent coatings provide fire resistance for structural steelwork. We explain specification, application, and inspection.. Intumescent Coatings How They Work Intumescent coatings expand when exposed to fire, forming an insulating char layer that protects the steel underneath from reaching its critical temperature. Types Thin film — applied like paint, up to 120 minutes protection Thick film — epoxy based, for heavy sections and external exposure Specification Requirements Section factor (Hp/A) calculation for each steel member Required fire resistance period (30, 60, 90, 120 minutes) Environmental exposure category DFT (dry film thickness) specification from manufacturer's data Application & Inspection Certified applicator (FIRAS, IFC, or LPCB) Surface preparation to SA 2.5 DFT measurements during application Third party inspection recommended Warranty and maintenance requirements For structural fire protection, contact us.