Flat roof replacement by GAX Roofing
Flat Roofs

Flat Roof Installation
in Rancho Cucamonga

TPO, PVC, EPDM, and modified bitumen for residential and commercial flat roofs. Built for California heat with proper drainage and waterproofing.

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✓ C39 Licensed & Insured
◈ TPO · PVC · EPDM · Mod Bit
⌂ Residential & Commercial
◐ Se Habla Espanol
What We Do

Flat Roofs That
Actually Hold Up

Flat roofs require a different level of attention than pitched roofs. Standing water, thermal expansion, and UV exposure are all bigger factors, and a flat roof installed without proper drainage planning or quality materials will fail faster and cause more damage than almost any other roofing failure.

We've installed flat roofs across the Inland Empire since 2022 and we know what works in this climate. We'll recommend the right membrane system for your property, budget, and usage, and install it to last.

Systems We Install

  • TPO (Thermoplastic Polyolefin), most popular for residential, energy-efficient white membrane, excellent for IE heat
  • PVC, highly durable, chemical resistant, great for roofs with HVAC or kitchen exhaust exposure
  • EPDM (Rubber), cost-effective, long-lasting, excellent UV resistance
  • Modified Bitumen, reliable workhorse system, excellent for complex roofs with many penetrations
  • Reflective coatings over existing systems when applicable

What We Assess Before Every Install

  • Drainage, existing drains, slope, and ponding areas
  • Deck condition, wood rot, moisture damage, structural integrity
  • Penetrations, HVAC units, vents, pipes, solar mounts
  • Parapet walls and edge conditions
  • Existing system condition if doing a recover vs. tear-off
Completed flat roof with mountains in background Flat roof with solar panels adjacent

Frequently Asked Questions

How long does a flat roof last in Southern California?

Quality TPO or PVC systems carry 15-25 year manufacturer warranties. Modified bitumen typically runs 15-20 years. Lifespan depends heavily on installation quality, drainage design, and maintenance.

Which flat roof system is best for the Inland Empire?

TPO is our most common recommendation for residential flat roofs in the IE. Its white reflective surface handles the heat well, it's cost-effective, and it performs reliably when properly installed and seamed.

My flat roof is ponding water, is that a problem?

Standing water (ponding) that remains more than 48 hours after rain accelerates membrane degradation and is a sign of a drainage problem. It's worth having us take a look, it may be addressable without a full replacement.

Can I put solar on a flat roof?

Yes. We coordinate with solar installers regularly to ensure penetrations are properly flashed and waterproofed. If you're planning solar, let us know, we'll design the install with that in mind.

Real Commercial Work in Redlands

A commercial flat roof replacement on a barbershop in Redlands. We tore off to the deck and found rot bad enough that in places you could see straight through into the building. Those sections were cut out, new framing and sheathing went in, and the new system went down over solid wood. This is the part nobody can quote from the parking lot.

Shops, offices and small multi-unit buildings have their own page: commercial roofing.

Rotted commercial roof decking with a hole opened through it during a Redlands tear-off Open joist bays on a Redlands commercial roof after rotted decking was removed New framing installed in a cut-out section of a Redlands commercial roof deck New cap sheet installed over the rebuilt deck on a Redlands commercial flat roof

Flat roof issues?
Free estimate, no obligation.

(909) 819-8394