Commercial Roof Retrofit
& Reroofing Systems
Full replacement isn't always the right answer. When your existing roof substrate is sound, a retrofit or recover system delivers a new warranty and extended performance at 30–70% of full replacement cost — with no tear-off, no landfill, and minimal operational disruption.
Is a Retrofit the Right Call for Your Building?
The answer depends on your substrate condition. A retrofit system requires that the existing roofing — insulation, deck, and membrane — be dry and structurally adequate to accept a new system on top. When it is, retrofit can cut project cost by 30–50% compared to full teardown and replacement.
Brown's Roofing performs an infrared or probe assessment to identify wet insulation before recommending a retrofit path. Wet insulation must be removed — it's not something to build over. We tell you honestly what percentage of your roof qualifies for recover and what needs full replacement, so you can make an informed capital decision.
The Assessment Process
Every retrofit recommendation starts with a written assessment. We document current roof condition, identify moisture intrusion areas, evaluate drainage, and present options with cost and warranty comparisons. You get a clear picture before committing to anything.
For property managers and building owners managing multiple properties, we can apply this process across your entire portfolio and develop a phased capital plan — prioritizing the buildings with the most urgent needs while maximizing budget efficiency across the board.
Retrofit vs. Full Replacement
System Options
Commercial Retrofit Systems
Single-Ply Recover
TPO or PVC over existing membrane
When your existing flat roof membrane is structurally sound but past its warranty period, a single-ply recover installs a new membrane directly over the existing system — no tear-off, no landfill, 30–50% cost savings over full replacement.
Metal Retrofit Roofing
Standing seam metal over flat or low-slope
A metal retrofit system installs a structural framework over your existing roof that creates a sloped surface, then covers it with standing seam metal panels. Eliminates flat roof drainage issues entirely and delivers a 40–60 year system with near-zero maintenance.
Coatings & Restoration
Silicone, acrylic, or polyurethane coating over existing membrane
A roof coating system adds a seamless, fully adhered waterproofing layer over your existing membrane. It restores energy efficiency, addresses small leak points, and carries a new manufacturer warranty — typically at 50–70% of replacement cost.
Modified Bitumen Overlay
Mod-Bit cap sheet over existing BUR or Mod-Bit
A torch-applied or cold-applied modified bitumen cap sheet applied over an existing built-up or Mod-Bit system. Adds a fresh waterproofing layer and extends system life by 10–15 years without the cost or disruption of a full teardown.
The Case for Retrofit
Why Property Managers Choose Retrofit
No Tear-Off Cost
Tear-off and disposal of an existing commercial roof is a major cost — typically 20–30% of a full replacement project. Retrofit eliminates it entirely.
Faster Installation
Without tear-off, retrofit projects finish faster — less disruption to your tenants, operations, and building schedule.
New Manufacturer Warranty
Most retrofit systems carry a full manufacturer warranty — the same coverage you'd get on a new installation.
Energy Performance Gains
Recover systems and coatings can significantly improve a roof's solar reflectance — reducing cooling loads and energy costs year-round.
Landfill Diversion
Keeping existing roofing in place reduces waste. For buildings pursuing sustainability certifications, retrofit is often a preferred path.
Capital Budget Flexibility
Retrofit defers the full capital expenditure of replacement while delivering a new warranty and extended performance — better for budget planning cycles.
FAQ
Roof Retrofit & Recover FAQ
- The terms are often used interchangeably, but technically: a 'recover' (or 'roof-over') installs new membrane directly over the existing roof — same plane, same drainage. A 'retrofit' typically refers to a metal retrofit, where a new sub-framing system is installed over the existing flat roof and metal panels are installed on top — creating a new sloped surface. Both eliminate tear-off; both deliver new manufacturer warranties.
- Recover is not appropriate when: (1) the existing insulation is wet across significant areas — moisture trapped beneath new membrane causes accelerated failure; (2) the deck is structurally damaged or significantly deflected; (3) building code in your jurisdiction prohibits a third roof system (most jurisdictions allow up to two); (4) the existing membrane has widespread saturation or organic decay. We perform a moisture scan and visual inspection first to confirm whether recover is viable.
- Yes. Recover and retrofit installations carry full new manufacturer warranties — typically 15-, 20-, or 25-year terms identical to new installation warranties. The warranty applies to the new membrane system; the existing roof beneath is not warranted but is left in place. Brown's Roofing is certified by the major commercial manufacturers, so we can register full NDL warranties on your project.
- Typical savings range from 20–40% on single-ply recovers, 30–50% on coating restorations, and 0–15% on metal retrofits (metal retrofit saves on tear-off but adds structural sub-framing cost). The exact savings depend on your existing roof condition, the recover system specified, and how much repair work is required before installation. We provide a side-by-side comparison estimate (recover vs. full replacement) on every retrofit assessment.
- A 30,000–50,000 sq ft single-ply recover typically takes 2–4 weeks of working time vs. 4–8 weeks for full tear-off and replacement on the same building. The savings come from eliminating tear-off and disposal — installation of the new membrane is comparable in time. For occupied buildings, the shorter timeline and absence of debris generation are often the biggest practical advantages.
- Most commercial structures can carry the additional weight of a single-ply recover (less than 1.5 lb/sq ft) without modification. Heavier recover systems — like metal retrofit with sub-framing — may require structural review. We assess structural capacity as part of the retrofit evaluation. For older buildings or structures with marginal capacity, a coating restoration (which adds essentially zero additional weight) may be the better path.
- Yes — that's one of its primary benefits. Metal retrofit systems install a sub-framing structure that creates positive slope across what was previously a flat or low-slope roof, eliminating ponding entirely. New gutters and downspouts are typically installed as part of the retrofit. For buildings where chronic ponding has been damaging the existing membrane, metal retrofit is often the most cost-effective long-term solution — and delivers a 40–60 year metal roof on top of the drainage fix.
Available Across Our Markets
Commercial Roofing
Is Retrofit Right for Your Building?
We'll assess your roof, identify what qualifies for recover, and give you a written comparison of retrofit vs. replacement — no obligation.