What Facility Managers Should Do in the First Hour of a Roof Leak

The first hour of a commercial roof leak is not for working out what failed. It is for protecting people, limiting what the water reaches, and capturing information that vanishes within hours. Diagnosis comes later, and it comes faster when the first hour is handled well.

Minutes 0–10: make the area safe

Where the leak lands matters as much as the leak. Above a corridor it is an inconvenience. Above a mechanical room, a server rack, stock or a production line it is an operations problem.

Move people clear, restrict access, get containers under active drips, and cover or shift whatever is underneath. If water is anywhere near electrical gear or sensitive equipment, that is a maintenance call to make immediately — not after the roofer is booked.

Minutes 10–30: document it before it changes

This is the step people skip, and the one that saves money. The first hour gives you the clearest picture you will get: stains spread, water tracks, and the evidence blurs.

• Where water is entering the space, and where it is landing
• Ceiling, wall and floor damage — photographed
• Standing water, and anything valuable within reach of it
• The time it was first noticed
• The weather at the time
• Whether this area has leaked before

Those last two matter more than they look. A leak during driving rain suggests one kind of failure; a leak after ponding or a thaw suggests another. And a leak in the same spot as last spring is a roof detail nobody fixed — not bad luck.

Minutes 30–60: contain, and resist the patch

Buckets, sheeting, move the stock. Then watch where the water actually goes.

On a flat roof, water rarely comes straight down. It travels through insulation, along the deck and around penetrations before it shows indoors — so the drip in your ceiling is often nowhere near the breach in the membrane.

That is also why an improvised patch is worse than none. It buys a day or two, then fails, and in the meantime it disguises the real entry point a contractor would have found. Sealing the wrong spot costs more than leaving it alone.

What to tell the roofer

Building and where the water is showing inside, when it started, the weather, whether that area has leaked before — and any recent rooftop work.

That last one is the most useful thing you can say. New HVAC units, plumbing penetrations, added openings: anything that put a fresh hole in the roof is a candidate, and it points the crew at the right area on arrival.

Then decide, once conditions allow

A first leak is sometimes a discrete failure and sometimes the first visible sign of a roof near the end of its life. That is a call to make on evidence — an inspection with moisture readings — not in hour one with water still coming in.

If water is coming in now, our emergency line is staffed around the clock. If it has stopped and you need to know why it happened, that is what an inspection is for.