Commercial Roof Leak Repair in Gilbert, AZ

Commercial Roof Leak Repair in Gilbert, AZ

A commercial roof leak is a business problem, not just a building problem. Water coming through a roof damages inventory, equipment, and finishes. It disrupts operations. It can trigger insurance claims. And it doesn't stop on its own — every day it goes unrepaired, the damage compounds.

We approach leak repair methodically. The goal isn't just to stop the water that's visible — it's to find every entry point and fix them all properly, so the same area doesn't leak again next monsoon season.

Why Leaks Are Hard to Find

Water is deceptive. It enters through one point on the roof, travels along structural elements, insulation, or the deck, and shows up as a stain on the ceiling somewhere completely different. A property manager who patches the area directly above the ceiling stain is often patching the wrong spot.

Finding the actual source requires working backwards from the interior water entry point — tracking the path water could have taken — and then systematically inspecting every potential entry point on the exterior. We don't guess and we don't just patch the most obvious-looking spot.

Common Commercial Roof Leak Sources

Pipe Penetrations

Every pipe, conduit, or cable that penetrates the roof is a potential leak point. The flashing boot around each pipe needs to be fully bonded to the surrounding membrane and properly sealed at the pipe. Rubber pipe boots crack in Arizona UV. Two-part clamping flashings can loosen. Sealants shrink and pull away. These are among the most common sources we find.

HVAC Curb Flashings

Rooftop HVAC units sit on raised curbs. The flashing membrane that covers the gap between the curb and the roof membrane is subject to constant movement as the unit vibrates, as the building expands and contracts, and as HVAC techs walk on and around the unit. Failed curb flashing is the single most common source of commercial roof leaks in Arizona.

Parapet Wall Flashings

Where the membrane turns up the parapet wall, it's exposed to thermal movement and wind. The termination bar or counter-flashing at the top of this upturned membrane eventually pulls loose or the sealant at the termination fails. Water runs down behind the flashing and onto the deck.

Open Membrane Seams

On older membrane roofs, seam adhesion can degrade over time. TPO and PVC seam welds hold well, but on EPDM systems with taped seams or on older modified bitumen systems, seam separation is common. A seam that's opening at one end often has undetected separation along its entire length.

Drain Area Failures

The membrane around a drain is bonded to the drain body using a clamping ring. Over time, the ring can loosen, the bonding membrane can delaminate, or the drain body itself can crack at the flange. Water backs up in the drain sump and finds its way through the failed seal.