Bureau of Indian Standards (BIS 1641–1968) has graded the structural elements into five grades with respect to ‘time in hours for resisting standard fire’, as shown in Table 29.2.
Table 29.2 Fire resistant grades
National Building Code graded type of construction into four categories as Type 1 to 4 as given in Table 29.3.
Based on the availability of firefighting equipment in the premises or the public fire brigade availability, the duration of fire-load of 2.10 × 106 to 4.60 × 106 is usually considered as less than 3 hours. Hence, all the normal buildings are considered to come under Type 1 construction. Further care should be taken for ventilation and escape of gases.
Table 29.3 Types of construction and hours of resistance
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