Ontario Roof Pros: Roof Replacement, Leak Repair & Membrane Roofing
Expert residential and commercial roofing services. Free inspections, written scopes, and work phased so your building keeps running.
- Licensed and insured California C-39 roofing contractor
- Free inspection with photographs and a roof plan
- Work phased around your shift schedule, written workmanship warranty
- Se Habla Español
Our Roofing Services in Ontario, CA
Roof Replacement
Replacement here comes down to one question: can the building keep working while the roof comes off? On a distribution building that answer drives the whole sequence, and on a house it decides how long the framing sits open to the sky.
Roof Leak Repair
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.
Storm Damage Restoration
The storms that hurt roofs in this valley are the winter atmospheric rivers, and on a low-slope roof the damage is usually not the wind at all. It is the water that could not leave the roof fast enough.
Hail Damage Roofing
Damaging hail is uncommon in Ontario. A cold winter cell can drop pea to marble sized stones across the valley, and it does happen, but most roofs we are asked to inspect for hail turn out to have something else wrong with them.
Wind Damage Roofing
Wind failure on a large low-slope roof begins at the corners. Uplift pressure is highest in the corner and perimeter zones, so a membrane fastened at field spacing all the way to the edge lifts there first and peels inward from a single loose sheet.
Roof Inspections & Moisture Surveys
A warehouse roof is an asset with a service life. The buildings that get twenty-five years from a membrane are the ones looked at twice a year, and the ones that get twelve are the ones nobody visited between leaks.
Asphalt Shingle Roofs
Shingles cover most houses in this city, and the mistake we correct most often is shingles installed somewhere they do not belong: a low-pitched addition, a patio tie-in, a converted porch with barely any fall across it at all. Below four in twelve, shingles need doubled underlayment.
Metal Roofing
Metal is a very good roof in the wrong place more often than people expect. On a wide, nearly flat Ontario warehouse deck, a screw-down metal panel is usually the weaker answer, and we will say that before we quote one.
Tile Roofing
Concrete and clay tile outlast the people who walk on it. Most tile work we do in Ontario starts with damage from another trade: an air conditioning service call, a solar installation, a satellite mount, a pest crew moving through the attic.
Flat & Low-Slope Roof Systems
A low-slope roof is a drainage plane with a waterproof skin, in that order. Get the fall right and almost any decent membrane performs.
Roof Coatings & Restoration
A coating is a legitimate way to add years to a sound roof and a very expensive way to hide a wet one. A core cut decides which situation you are in, and no brochure can answer that question for you.
Roof Ventilation
There are two ventilation conversations in this city and they have opposite answers. A vented attic needs balanced airflow.
Skylights & Roof Hatches
Skylights in this city are mostly not on houses. They sit in long rows on warehouse roofs, acrylic domes bringing daylight down onto racking and taking a real bite out of the lighting bill in a building that runs two shifts.
Gutters & Downspouts
Gutters matter less here than in a wet climate for eleven months of the year and more than anywhere for the twelfth. One February storm sends a season's rain through the same valley outlet, and undersized runs let go exactly then.
Fascia, Soffit & Edge Metal
Rotted fascia in Ontario is almost never weather. In a climate with under a foot of rain a year, trim fails where water was delivered to it: a leaking gutter joint, a missing drip edge, a valley overshooting, a downspout discharging onto the board below.
Chimney & Wall Flashing
In a dry climate a failed flashing hides for years. Nothing shows through summer, the first substantial December storm runs water down the framing, and by then the damage inside the wall is considerably older than the stain on the ceiling.
Emergency Tarping & Water Control
On a house we tarp. On a warehouse membrane there is often nothing to tarp to, so the emergency becomes water control: pull the standing water off the deck, weld a temporary patch, and protect whatever sits under the leak inside the building.
Commercial & Warehouse Roofing
Ontario runs on buildings that cannot close. Fulfilment centers, cold storage, cross-docks and light industrial buildings near the airport all need roofing done around a shift schedule instead of in place of one, and that constraint shapes every decision.
Insurance Claim Help
Most roofs we look at in this valley are failing from age and sun rather than from an event, and an age-related failure is not a claim. Knowing which one you have before you telephone your carrier is worth real money and a good deal of aggravation.
Ontario Roof Pros is a licensed and insured roofing contractor in Ontario, California, working on roof replacement, roof repair and low-slope membrane roofing for houses, apartment buildings and the distribution buildings this city was rebuilt around. Residential and commercial, our own crews, written scopes, and a real opinion about what your roof needs this year rather than a menu of upgrades.
We install laminated architectural shingles, concrete and clay tile, 24-gauge standing seam metal, and single-ply membranes in TPO, PVC and EPDM over tapered polyisocyanurate with a high-density cover board. We repair leaks, flashings, drains, scuppers, skylights, gutters and edge metal, and we will tell you when a repair is the better purchase than a replacement, because on plenty of roofs in this city it still is.
Every inspection comes back as photographs, findings and a priced scope rather than a sales visit. Warehouse and industrial work is phased so the building keeps shipping, houses are dried in on the same day the roof is opened, and each proposal names the membrane thickness, the fastening pattern, the insulation and the warranty, so one bid can be compared against another. Call for a free roof inspection.
What Ontario Customers Say
They found the leak forty feet from the stain in our warehouse office, on the flute of the deck, and welded a patch the same afternoon. The report came with photographs and a marked roof plan, and they told us the roof had six good years left rather than trying to sell us a new one.
Our tile roof got walked on during a solar install and three tiles cracked. They matched the profile from salvage, reset the course, and checked the whole field for the ones we had not spotted. Priced as a repair, finished in a morning, no upsell attempted.
We asked for a coating on a low-slope building and they cut cores first, found wet insulation in two areas, and told us a coating would waste our money. Ended up replacing one section and coating the rest. Straight answers and a scope we could actually compare against other bids.
Shingle tear-off on a two-storey house with a narrow side yard. They brought a conveyor, kept the driveway clear, dried the roof in the same day, and ran magnets over the yard twice. The flashing work at the chimney is better than what was there before.
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
- ✓Drainage corrected with tapered insulation, crickets and sumps rather than inherited from the last roof
- ✓Numbered roof plans and dated photographs, so next year's inspection compares like for like
About Ontario Roof Pros in Ontario, CA
Ontario Roof Pros works from an office on Guasti Road, a few minutes from the airport and from the distribution buildings that make up most of our commercial work. We roof houses in the older neighborhoods along Euclid Avenue and in the newer tracts of Ontario Ranch, and we roof the warehouses in between.
The way we work is unglamorous. Photographs of everything, core cuts before opinions, a numbered roof plan on commercial buildings, and a written scope that names the material, the thickness and the fastening pattern. Our crews are our own, the foreman on your roof is somebody who walked it with us, and the number on the proposal is the number on the invoice.
There are jobs we are the wrong company for. If you want the lowest price in the valley, somebody will beat us, usually by leaving out the cover board, the taper or the flashing metal. If your roof needs a four-hundred-dollar repair and you would rather be sold a replacement, we will disappoint you. We also do not sign contingency contracts that only take effect if an insurance claim is approved.
How It Works
- 1
Inspection and roof plan
We walk the roof, photograph every detail, test the drains, and on commercial buildings number each drain, curb and penetration on a roof plan. Core cuts get taken wherever the moisture readings disagree with what the surface looks like, so the recommendation rests on evidence.
- 2
Written scope and honest options
You get a priced scope naming the system, the thickness, the insulation and the fastening pattern, usually with a repair option sitting beside the replacement option. If the cheaper path is the honest one for your building this year, that is the one we recommend in writing.
- 3
Phased installation
Warehouse work is sequenced by roof section and dock activity, and each day's area is dried in before the crew leaves the site. On houses we tear off, deck, underlay and finish one roof at a time rather than opening more than we can close before dark.
- 4
Closeout, warranty and interval
We run magnets over the site, walk the finished roof with you, hand over photographs of everything now buried under the covering, register the manufacturer warranty where one applies, and set the inspection interval that keeps that warranty valid.
Warehouse, Cold Storage and Industrial Roofing in Ontario
Most of the roof area in this city belongs to buildings that cannot stop working, and that is the work we are built around. We survey with infrared and core cuts, produce a numbered roof plan, phase replacement by section and by dock activity, and dry in each day before the crew leaves. Single-ply over tapered insulation, drainage corrected rather than inherited, penetrations properly supported, and a warranty that stays valid.
- ✓Mechanically attached and induction-welded TPO on large roof areas
- ✓PVC and KEE membrane where kitchen or solvent exhaust lands
- ✓Two-ply SBS modified bitumen where service traffic never stops
- ✓Tapered polyisocyanurate, crickets and drain sumps to build fall
- ✓Retrofit drains, new strainers and overflow scuppers opened up
- ✓Tested ES-1 edge metal, coping and parapet detailing
- ✓Pipe supports on sleepers and walk pads to the rooftop units
- ✓Phased sections, daily dry-in and coordinated equipment shutdowns
Service Areas
Ontario Roof Pros serves Ontario, CA and surrounding communities including:
Recent Projects Across the Inland Empire
Frequently Asked Questions
Does a re-roof in Ontario have to be a cool roof?
Ontario sits in California climate zone 10, and Title 24 sets cool-roof requirements that reach most low-slope non-residential re-roofing, with separate provisions for steep-slope residential work. In practice the product needs a CRRC-listed aged solar reflectance and thermal emittance, and that listing goes into the permit paperwork.
On a warehouse it is rarely a constraint, since nearly every TPO and PVC membrane is white to begin with. On a tile or shingle house it changes which colors qualify, so we check the listing before you choose.
Can you re-roof a warehouse while we keep shipping?
Yes, and that is most of what we do. We phase the roof by section, work the areas furthest from the active dock doors first, and dry in every day's work before the crew leaves.
Hot work stays clear of intakes and stored product, and anything that requires a rooftop unit to be shut down gets scheduled with whoever maintains it. You get the sequence in writing before we start, so you can tell a tenant which week affects which bay.
My office ceiling is stained but the roof looks fine. What is happening?
On a steel deck, water travels along the flute until it reaches a seam, a fastener or a joint, so the stain can appear a long way from where the water got in. The entry is usually a small breach at a curb, a pipe penetration, a lap or a drain, and the roof surface around it can look perfectly healthy. We trace the drainage path, flood test the suspect area, and take moisture readings before opening anything up.
Is hail damage common in Ontario?
Damaging hail is uncommon here, though a cold winter cell does occasionally drop small stones across the valley. Most roofs we are asked to inspect for hail turn out to be showing age-related granule loss, thermal blistering on a dark low-slope surface, or mechanical damage from service traffic. We inspect with test squares and photographs, and if it is not hail we tell you in writing before anybody files a claim that is likely to be denied.
Do you pull permits for roofing work?
Yes. Re-roofing needs a permit in this area, and the inspection that follows is worth having on record when you sell the building or file a claim. We pull it, meet the inspector, and keep the cool-roof product listing and the underlayment details with the paperwork. On commercial work we also register the manufacturer warranty, which is a separate process that people often assume happens automatically and it does not.
When is a coating a better choice than a new roof?
When the insulation under the membrane is dry, the laps are sound, the drains work and the surface has simply weathered. A silicone or acrylic restoration system over a roof in that condition costs a fraction of a tear-off and can be renewed later with another coat. When the cores come back wet, or the roof has blisters that pump water underfoot, coating it adds weight and traps moisture. We take cores first and give you the answer either way.