Fire Safety for Glass Balustrades on Shared Stairwells

Why shared stairwells need a closer look

A shared stairwell is the main escape route for every resident or occupant of a building, so anything fixed along it is judged differently from a private balcony. The balustrade must stay in place during an emergency, must not fall apart or shed sharp pieces onto people evacuating, and must not add materials that spread smoke or flame.

Glass railings are often chosen for their light appearance, but the design decisions behind them affect how the stairwell performs when it matters most. A safety officer should treat the balustrade as part of the building's fire strategy, not as a decorative finish.

Key questions to ask before approval

Start with a short list of questions that the installer and the engineer should answer in writing:

• Does the balustrade keep the required clear width of the escape route?
• Is the glass laminated or toughened, and how does it behave when broken?
• Are the fixings and the handrail mounted to the structure, not to the glass alone?
• Does any material add combustible load to the stairwell?

Written answers make later inspections far easier.

Glass type and breakage behaviour

Laminated safety glass is generally preferred on stairwells because the interlayer holds broken pieces in place rather than letting them fall. Toughened glass shatters into small granular pieces when it fails, which can be safer than sharp shards but still leaves an opening that must be considered in the design.

Ask for the glass specification and the interlayer details. Exact thickness and performance values depend on the span, the loads and the local standard, so these should be confirmed with the engineer rather than taken from a general rule of thumb.

Fixings, handrails and structural support

Many failures come from fixings rather than from the glass itself. The base shoe, the clamps and the handrail brackets should be anchored to the stair structure, and the connections should be inspected for corrosion, loose bolts and sealant damage. Stainless steel or hot-dip galvanized fixings are commonly used in stairwells because they resist weathering and keep their strength over time.

The handrail must be continuous and graspable, and its height and load capacity should be checked against the Israeli railing standard SI 1142, with exact values confirmed by the engineer.

Escape route, clearances and combustible material

The balustrade should never reduce the required width of the escape route, and nothing should be stored against it. Keep decorative items, planters and loose furniture away from the glass and the handrail. Where a finish or sealant is applied, confirm that it does not produce dense smoke or toxic fumes when heated.

Check that the installation does not block emergency lighting, signage or fire door operation.

Inspection and maintenance routine

Set up a simple routine so the balustrade is checked regularly rather than only at handover. A quarterly visual check can look for cracks or chips in the glass, loose handrail brackets, corroded fixings, damaged sealant and any new objects placed near the railing. After any impact, such as a moving load or a collision, the area should be inspected before it is returned to normal use.

Keep a logbook with photos and dates so that changes can be tracked over the building's life.

Frequently asked questions

Is laminated glass always required on shared stairwells?

Not always, as requirements depend on the building type, the fire strategy and local rules. Laminated glass is commonly preferred because broken pieces stay in place, so confirm the choice with the engineer and the fire authority.

Can a glass balustrade reduce the escape route width?

The balustrade should not reduce the required clear width of the escape route. Check the drawings and the installed dimensions against the minimum width set by the applicable rules.

Which fixings are best for a stairwell balustrade?

Stainless steel or hot-dip galvanized fixings are commonly used because they resist corrosion. Each fixing should be anchored to the structure and inspected regularly.

How often should a glass railing be inspected?

A visual check every quarter is a practical starting point, with an extra inspection after any impact or heavy use. Keep records of each check so changes can be spotted early.

Common mistakes to avoid

Approving the glass without checking the fixings and the escape route clearance is the most common error. Relying only on the appearance of the glass, without written engineering details, makes later problems hard to resolve.

Our recommendation

Ask for a written specification covering glass type, fixings, handrail details and clearances, and have the project engineer confirm them before installation. Set a simple inspection schedule from day one so the balustrade stays safe over time.

Summary

Glass balustrades on shared stairwells must protect the escape route, use suitable glass and fixings, and be inspected regularly. Confirm all exact requirements with the engineer and the fire authority before approval.

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