Ontario Roof Pros provides professional roof leak repair in Ontario, CA for residential and commercial properties across the Inland Empire. A leak on a nearly flat roof almost never drips where it entered. Water runs along the flute of a steel deck until it finds a seam or a fastener, so the stain in the office ceiling can sit forty feet from the actual breach in the membrane.
That is why we trace the drainage path before opening anything. On membrane we flood suspect areas, probe seams with a blunt hook, and check every drain bowl, clamping ring and scupper. On shingles we work uphill from the stain: fasteners, valley metal, wall terminations, then the penetration nobody mentioned when they booked the call. Attic inspection comes first on a house, because a wet rafter narrows the search faster than anything on the surface.
Most repairs we make in this city are not in the field of the roof. They are at pipe boots split by ultraviolet exposure, at equipment curbs where sheet metal was screwed through instead of counterflashed, at satellite and solar mounts fastened straight through a finished surface, and at the edge where somebody terminated a membrane with mastic because the correct bar was a longer trip to the supplier.
Repairs come in grades and we name the grade out loud. Cover tape welded onto sound membrane buys real years. A tab replaced in a healthy shingle field is a genuine fix. Mastic troweled across a saturated modified-bitumen roof buys one dry winter and hides a wet deck, and if that is the only thing in the budget this year, you should at least know exactly what you are buying.
Rain arrives here in a handful of concentrated storms. The airport gauge averages 11.64 inches a year, roughly four fifths of it between December and March, so a small breach can soak insulation for months before anything shows on a ceiling tile. We cut and probe rather than guess at how far the water has travelled, and we mark the wet area on the plan even when the repair itself is small.
Findings come back photographed, keyed to a roof plan on commercial buildings, and priced against what replacing that section would cost. The decision should be arithmetic, not pressure. We would rather sell you the cheap repair twice than the wrong replacement once, and we will put the remaining service life in writing so the next decision is easier.
Our licensed and insured team brings the right materials and equipment to every job — tapered polyisocyanurate built to a quarter-inch-per-foot fall, hot-air-welded PVC with a KEE plasticizer, tested ANSI/SPRI ES-1 edge metal and coping, two-ply SBS modified bitumen set in cold adhesive, retrofit drains sleeved into existing cast-iron leaders, walk pads routed between rooftop units — and backs the work with a written workmanship warranty. We serve Ontario and nearby communities including Chino, Chino Hills, Montclair, Upland.
What We Handle
Everything our roof leak repair in Ontario covers
One crew, one point of contact, and the full range of roof leak repair work in Ontario, CA. If it is on this list we do it in house rather than handing it to a subcontractor:
- roof repair
- roof leak repair
- leak detection
- flood testing
- pipe boot replacement
- membrane patch
- shingle repair
- emergency leak repair
- commercial roof repair
- wet insulation removal
- roof repair cost
Not sure which one describes your situation? Describe it in plain words and we will sort it out — or browse the rest of our Ontario services.
Materials, equipment and how we do roof leak repair
The difference between roof leak repair that lasts and roof leak repair that gets redone in three years is almost always preparation and materials, not the finish you see on day one. We work with tapered polyisocyanurate built to a quarter-inch-per-foot fall, hot-air-welded PVC with a KEE plasticizer, tested ANSI/SPRI ES-1 edge metal and coping, two-ply SBS modified bitumen set in cold adhesive, spec them to the job instead of to the invoice, and write the material grades into the free estimate so you know exactly what you are buying.
Every Ontario job runs the same way: site walk and measurements, written scope and fixed price, protection of the surrounding area, then the work itself with a daily clean-up. Years of roofing work in the Inland Empire means we have already met whatever your property is going to throw at us — awkward access, older construction, an HOA with opinions.
Where we do roof leak repair outside Ontario
Ontario Roof Pros covers Ontario and the surrounding communities of the Inland Empire. Crews run out to the same nearby cities every week, so an out-of-town job does not mean an out-of-town price.
- Roof Leak Repair in Chino, CA — San Bernardino County, population 91,403
- Roof Leak Repair in Chino Hills, CA — San Bernardino County, population 78,411
- Roof Leak Repair in Montclair, CA — San Bernardino County, population 37,865
- Roof Leak Repair in Upland, CA — San Bernardino County, population 79,040
- Roof Leak Repair in Rialto, CA — San Bernardino County, population 104,026
- Roof Leak Repair in Colton, CA — San Bernardino County, population 53,909
Start on the Ontario Roof Pros homepage for a free estimate, or call (844) 511-2320 and describe the job.
Why Ontario Chooses Ontario Roof Pros
- ✓Core cuts and moisture readings before any recommendation, so the scope is based on evidence rather than a walk-around
- ✓Warehouse and industrial work phased by roof section, with every day's area dried in before the crew leaves
- ✓Proposals name the membrane thickness, insulation, fastening pattern and edge detail, so bids can actually be compared
- ✓We quote the repair beside the replacement and recommend the cheaper one when it is the honest answer
The standards behind roof leak repair
Quality here is not a matter of opinion — it is written down. The roof leak repair work we do in Ontario follows published industry standards: NRCA publishes the Roofing Manual, the industry's reference for details and slope minimums, and Asphalt Roofing Manufacturers Association sets the shingle application and ventilation guidance the warranties reference. If a contractor cannot tell you which standard a detail comes from, that is worth asking about before you sign.
Every roof leak repair project in Ontario gets the same attention, whether it is a single room or a full commercial job. We show up on schedule, keep the site clean, and stand behind the work — the estimate is free and there is no pressure.
Ready to get started? Call (844) 511-2320 for a free roof leak repair free estimate in Ontario, or request a quote and we'll get right back to you.