Gas presence on a roof during ventilation: what action should be coordinated?

• A. Coordinate with gas shutoff and avoid ignition sources near gas lines
• B. Ignore gas lines if wind is blowing away
• C. Increase ventilation openings near gas lines
• D. Cut gas lines to prevent explosion

Answer: (A)

Gas on a roof during ventilation creates a real ignition risk. The safest approach is to coordinate with the gas utility to shut off the gas supply and to eliminate any ignition sources near the gas lines. When the gas is shut off, there’s no fuel available for a potential flame or explosion, and removing ignition sources—no sparks, flames, or hot work near the lines—further reduces the chance of an ignition even if a small amount of gas is present in the air. This combination protects the crew and the surrounding structure while allowing ventilation to proceed more safely.

Ignoring gas lines is dangerous because gas can accumulate unexpectedly and seek an ignition source; increasing ventilation openings near gas lines could spread flammable gas or bring more air into contact with it; cutting gas lines yourself is a task for utility personnel and can create additional hazards if not done by trained professionals.