Are PEB Buildings Fireproof? Fire Safety, Fire Rating and Compliance Guide for India (2026)

Why Steel Is Not Fireproof: What Happens to a PEB Frame in a Fire

Steel is non-combustible, so it does not ignite, smoke or add fuel to a fire. The risk is thermal: as steel heats up, it softens and loses load-carrying capacity. Eurocode 3 (EN 1993-1-2), the reference standard for structural fire design, gives the yield-strength curve for ordinary structural steel.

The 550 °C figure is a guide, not a fixed collapse point. The Steel Construction Institute notes that the limiting temperature depends on how heavily the member is loaded and how it is heated: a loaded beam under a concrete slab, for example, can survive to about 620 °C, while a beam heated on all four sides is closer to 550 °C.

Why PEB frames need extra attention

PEB primary frames use tapered, built-up I-sections with thin webs, which is what makes them economical. Thin, slender members have a high section factor (heated surface area compared with steel volume), so they heat up faster than heavy hot-rolled sections. Indian fabricators who specify fire protection for PEB, such as Steelworks, report that unprotected steel can reach critical temperature in about 10 to 20 minutes of a developed fire. That is rarely long enough for a full evacuation and fire-service response in a large warehouse.

In real incidents the structure is seldom the first thing that burns. Stored goods, racking, packaging, plastics and combustible insulation supply the fire load. The steel's job is to stay standing long enough for people to leave and for firefighters to act.

What a fire rating (R30, R60, R90, R120) means

A fire rating states how many minutes a protected structural member keeps carrying its load in a standard fire test. R60 means 60 minutes. In India, the test method for building elements is IS 3809 (technically equivalent to ISO 834-1). The rating a building needs depends on its occupancy, height, floor area, stored materials and distance from boundaries. Many single-storey industrial buildings need R30 to R60 for columns and primary rafters. Larger warehouses, high-rack storage and multi-storey PEB buildings can need R90 or R120.

How to Make a PEB Fire-Resistant: Coatings, Panels and Layout

Fire resistance in a pre-engineered building comes from three layers working together: protecting the steel, choosing non-combustible envelope materials, and designing the layout to slow fire and smoke.

1. Protecting the steel frame

Four methods are used to protect structural steel. The right one depends on the rating required, whether the steel stays visible and the budget.

Two points decide whether a coating performs: the section factor of the member and the thickness actually applied. A thinner, more slender section needs more coating than a stocky one for the same rating, and under-applied paint will not reach its rated performance. Ask for the manufacturer's third-party test data and a record of thickness checks.

Active systems can also change the passive requirement. In many design approaches, a properly designed sprinkler system reduces the fire resistance rating needed for structural members, so protection, layout and suppression are best decided together at the design stage. Retrofitting protection after erection usually costs more and is harder to inspect.

2. Choosing fire-safe roof and wall panels

Insulated sandwich panels often decide how a PEB behaves in a fire, because the core is part of the fuel load.

A panel's fire rating applies to the complete tested assembly, including joints, fixings and support spacing, not to the core alone. Look for third-party certification such as FM Approvals or test reports under EN 13501 and EN 1364.

3. Layout and passive design measures

• Compartmentation: fire-rated walls and doors divide the building so a fire cannot cross it freely. Separating walls should be designed to stay stable if the framing on one side is damaged.
• Fire stopping: sealed penetrations for cables, ducts and pipes stop fire and smoke moving between compartments.
• Smoke control: roof-mounted smoke vents or mechanical extraction keep temperatures lower and exit routes visible.
• Fire-rated doors, windows and cladding at openings and external walls.
• Access and separation: clear fire-service access and sensible distances between buildings and stacks of goods.
• Safe storage of flammable and hazardous materials, away from ignition sources.
• Electrical safety: correct load calculations, protective devices, proper earthing and regular inspection, because electrical faults are a well-known ignition source in industrial buildings.

Fire Safety Systems and Compliance for PEB Buildings in India

Active fire protection

Protected steel buys time. Active systems detect the fire early and control it. A PEB warehouse, factory or shed typically needs the following, sized to its occupancy and risk:

• Smoke and heat detection with a fire alarm panel
• Automatic sprinklers where the occupancy, area or storage height requires them
• Fire hydrants, hose reels and a fire water supply
• Portable extinguishers at specified intervals
• Emergency exits, emergency lighting and exit signage
• Smoke ventilation and a clear route for fire-service vehicles

These systems only help if they work on the day. Schedule regular inspection, testing and maintenance, and keep the records.

Compliance in India: what changed in 2026

For years, designers worked from Part 4 (Fire and Life Safety) of the National Building Code 2016. In April 2026, the Bureau of Indian Standards replaced that code with the National Building Construction Standards (NBCS) 2026, also referred to as SP 7:2026. Reports summarised by Drishti IAS, citing the Times of India, say the new document is advisory at national level, changes the wording of the fire and life safety provisions from "shall" to "should", and leaves more decisions to state governments. Engineering associations have objected to the change. Because this is recent, confirm which edition your state fire department and approving authority are applying before you finalise the design.

In practice, the requirements that decide your project are these:

For projects in Delhi NCR, Haryana and Uttar Pradesh, the Fire NOC comes from the relevant state fire service, such as the Delhi Fire Service, so check the current portal, forms and fees with that office. For UAE projects, approvals run through Civil Defence under the UAE Fire and Life Safety Code. Ask your PEB manufacturer to design for the stricter of the national and local requirements, because a design that meets a lower standard can fail the NOC inspection.

PEB vs Conventional Construction: Is a PEB Less Fire-Safe?

Not inherently. Reinforced concrete gets some fire resistance from its mass and cover. A PEB gets the same result by protecting the steel and specifying the envelope correctly. Either system can be unsafe if it is under-specified, and either can meet R60 to R120 when it is designed for it. The PEB advantages for fire safety are factory-controlled fabrication, consistent coating quality and a non-combustible structural frame. The responsibility is to specify the protection early and verify it on site.

Fire-Safety Checklist Before You Order a PEB

• Occupancy, stored materials and maximum storage height are defined in writing
• The required fire rating (R30, R60, R90 or R120) is confirmed with a fire consultant or the local authority
• A protection method is chosen, with section factors and coating thickness calculated member by member
• The coating has third-party test data, a trained applicator and a thickness inspection plan
• Panel cores are specified (mineral wool or certified PIR where a fire rating is needed) with assembly certificates
• Fire walls, fire doors and fire stopping appear on the drawings
• Sprinkler, detection and hydrant design is coordinated with the structure, including the extra roof load from sprinkler pipework
• Smoke vents, exits, emergency lighting and fire-service access are shown
• The Fire NOC route and its documents are agreed, with a named person responsible
• Your insurer's fire requirements have been checked
• A maintenance plan covers coating damage, corrosion, panel joints and fire systems

How Kaizen Smartbuild Approaches Fire-Safe PEB Projects

Kaizen Smartbuild (Kaizen Steel Building Solutions Pvt. Ltd.) designs and manufactures pre-engineered buildings, roofing and wall panels, mezzanines, multistorey buildings and related systems from its base in Delhi. Our project case studies include OM Logistics, Goyal Inc and IOCL Panipat. For fire safety, the practical advice is the same one we give clients: settle the fire brief before section sizes are fixed, because rating, coating, panel core and sprinkler layout all feed back into the structural design.