Commercial Roof Replacement in Ontario

Full Tear-Off Roof Replacement on Ontario's Biggest Decks

The replacement plan explains tear-off or recover assumptions, insulation and drainage needs, occupied-building phasing, system options, and closeout requirements. Tearing a roof off a quarter-million-square-foot building next to the ONT air cargo ramps is a logistics operation first and a roofing project second. Tonnage, truck cycles, weather windows, and deck repair pricing decide whether the job lands on budget. We estimate all four before a single cut is made.

When Tear-Off Stops Being a Choice

Three findings take the recover option off the table. First, the building already carries two roof coverings, which is the code maximum in California. Second, the moisture scan shows widespread saturated insulation, and covering wet board only relocates the failure. Third, the existing assembly is delaminating or the attachment has let go, so there is nothing sound to fasten a new membrane to.

We see all three regularly in Ontario's older corridors. The 1970s and 1980s buildings off Mission Boulevard and around the Guasti district often carry a built-up roof under a modified bitumen cap sheet under an aged coating: three interventions deep, with gravel in between. The only credible line item for those roofs is removal to the deck.

There is a structural argument too. Saturated insulation and stacked roof layers add dead load the panelized wood framing common in this valley was never asked to carry. Taking four layers of wet material off a long-span roof is more than a code exercise; it is weight coming off members that also see forklift-mounted racking loads below.

Debris Math: What Comes Off and Where It Goes

A gravel-surfaced built-up roof can weigh several hundred tons on a large warehouse. Our estimates state the assumed debris weight, the number of truckloads, and the disposal rate, because tipping fees at the inland landfills are a genuine cost line, not a rounding error. Clean tear-off streams get separated where the numbers work: metal edge and old sheet metal to recyclers, and single-ply membranes to recycling programs when the take-back economics beat the landfill rate.

Truck routing matters in this submarket. Loading debris out of a site on Jurupa Street or Milliken Avenue at the same hours the drayage fleet is queuing for the dock doors creates conflict. We schedule haul-off cycles around the tenant's inbound windows and put the agreed truck route in the site logistics plan.

Deck Repair: The Line Item That Blows Up Bad Bids

Nobody can see the deck until the roof is off, so the difference between estimators shows up here. Our proposals carry a defined deck allowance and unit prices: per sheet of plywood on panelized wood decks, per square foot of rust treatment or pan replacement on steel decks, per linear foot of nailer replacement at the perimeter. When we open the roof and find more damage than the allowance covers, you get photographs, a measured quantity, and the pre-agreed unit price. No negotiating leverage games in the middle of your project.

Cold storage and food-processing buildings deserve special mention. Steel decks over freezer boxes near the airport frequently show underside corrosion from decades of vapor drive. We inspect from below during estimating whenever access allows, so the allowance reflects reality instead of a .

Only Open What You Can Close: Weather Discipline

Ontario weather punishes overconfident tear-off crews twice a year. Winter atmospheric river storms can drop an inch of rain in hours onto an open deck, and fall Santa Ana events will pick up unsecured insulation boards and send them off a forty-foot parapet. Our rule is fixed: no section is opened that cannot be made permanently or temporarily watertight the same working day, and loose material is weighted or removed before every shift ends, wind forecast or not.

That discipline shows up in the schedule as smaller daily sections during storm season and larger ones in the dry months. It costs a little production speed. It costs far less than saturating a tenant's inventory or explaining a blown-off board on the 10 freeway shoulder.

What the Replacement Assembly Should Include

Once the deck is clean and repaired, the new assembly is specified to current code and to your hold strategy. A complete replacement scope in this market normally covers:

• New vapor retarder where conditioned or refrigerated space demands one
• Polyiso insulation meeting Title 24 continuous R-value for climate zone 10
• Tapered insulation or crickets to kill the ponding the old roof developed
• 60-mil or 80-mil single-ply membrane, thickness matched to the hold period
• New edge metal and coping fabricated to ANSI/SPRI ES-1 wind ratings
• Replacement of aged skylights and smoke hatches while access is cheap

Skylight replacement during a tear-off is the cheapest it will ever be; retrofitting them later means mobilizing again. We price the option in every replacement bid and let you decide.

Questions Owners Ask Before a Tear-Off

How much more does tear-off cost than a recover?

Plan on roughly double, driven by demolition labor, disposal tonnage, and a fuller insulation package. The exact spread depends on how many layers come off and what the deck needs. We quote both paths when both are legal so the premium is visible.

Can the building stay occupied during removal?

Yes, with a real logistics plan. We isolate work zones, protect racking below active tear-off with interior catch protection where deck gaps exist, and coordinate dock and parking access daily with your operations lead.

What happens if it rains mid-project?

Nothing dramatic, because the open area was sized to be closed before the crew left. Completed sections are watertight, the day's section is temporarily sealed, and staged materials are covered and weighted as standard practice.

Who pulls the permit and handles Title 24 paperwork?

We do. The City of Ontario requires a permit for reroofing, and the energy code compliance forms are part of our scope, including the cool roof product documentation plan check wants to see.

How do you price hidden deck damage fairly?

With unit prices agreed before contract signing and photo documentation of every quantity claimed. You should never see a lump-sum surprise for deck work, on our jobs or anyone else's.

Related

Ready to review the roof scope?

Request a Roof Assessment