IS 11057 provides the framework for fire grading of buildings and fire resistance classification of building elements. Type 1 (fire resistive) to Type 5 (wood frame). Specifies minimum fire resistance ratings (1-4 hours) for walls, floors, columns, and beams based on building type.
Recommendations for fire grading of buildings and classification of building materials and elements by fire resistance.
Key Values
Type 1 (fire resistive)4 hour fire rating for structure
Type 2 (non-combustible)2 hour fire rating
Type 3 (exterior protected)1 hour fire rating
Practical Notes
! High-rise buildings (>15m) MUST be Type 1 or 2 per National Building Code.
! Fire resistance rating is tested per IS 3809 — standard fire curve exposure for specified duration.
! RCC columns/beams achieve 1-2 hour fire rating with standard covers per IS 456.
! Steel structures need fire protection (intumescent paint, spray fireproofing) to achieve fire ratings.