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One Way Roofing — roofing contractor in Downey, CA
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Commercial roofing · Downey & LA County

Commercial roofs that don't interrupt business.

Flat and low-slope systems for retail, industrial, and multi-family buildings — installed, restored, and maintained with tenants still inside.

Off-hours & phased scheduling around your operations

Photo condition reports for owners & property managers

Maintenance programs that prevent the 3am phone call

Request a Bid Call (562) 516-4606
Bright white TPO flat roof on a commercial building, HVAC units lined up under a midday sky

Capabilities

Every flat-roof system, one accountable crew.

TPO single-ply

Reflective, heat-welded membrane — the modern standard for flat roofs under California sun.

Torch-down (modified bitumen)

Proven multi-ply protection for roofs that see foot traffic, equipment, and hard use.

Coatings & restoration

Silicone and acrylic systems that add years to a structurally sound roof — without a tear-off.

Flat roof repair

Ponding, blisters, seam failures, and penetrations — diagnosed at the source and fixed to spec.

HVAC curbs & penetrations

Unit swaps, new curbs, and pipe penetrations flashed and sealed correctly during equipment work.

Preventive maintenance

Scheduled roof inspections, drain clearing, and photo reports — per building, per quarter.

Who we work with

Built for people who answer to other people.

Property managers, building owners, HOAs, and general contractors get the same thing from us: a written scope, a disruption plan, photo documentation at every visit, and one accountable point of contact. When a tenant calls you about a drip at midnight, our 24/7 emergency roof repair line is the number you forward.

Property managers Building owners HOAs General contractors Retail & industrial

Portfolio pricing? No —

Portfolio accountability.

Multiple buildings? We'll walk every roof, rank them by urgency with photos, and give you a plan that spreads work sensibly — so nothing fails unannounced.

Schedule a portfolio walk

Commercial roofing questions, answered.

Usually, yes. We phase sections, schedule loud work off-hours where needed, and keep access routes clear. The disruption plan is part of the written scope, agreed before day one.

It depends on foot traffic, rooftop equipment, drainage, and sun exposure. TPO reflects heat and welds clean; torch-down takes abuse well. We'll show you the tradeoffs on your actual roof, not a brochure.

Water still sitting after 48 hours accelerates membrane wear and finds seams. It's often fixable with tapered insulation, drain corrections, or added scuppers — cheaper than the leak it eventually causes.

Yes. Scheduled inspections, drain and debris clearing, photo condition reports per building, and priority emergency response for enrolled properties.

Get a bid you can actually compare.

Line-item scope, disruption plan, and photo documentation — before you commit to anything.

Request a Bid Call (562) 516-4606