Roof Recover and Overlay in Franklin, TN

Water does not care how many layers a roof has. It cares whether the bottom layer is dry. That one fact decides every recover project, which is why we start by finding out what is trapped under the existing membrane in Franklin, TN before anyone quotes a new surface. A recover, sometimes called an overlay, installs a new membrane over the old roof instead of tearing it off. When conditions allow it, the savings are real. When they do not, it buries a wet roof under a fresh one.

Commercial Roofing Franklin handles recover work on offices, retail centers and light industrial buildings across Williamson County. Three checks decide whether an overlay is a sound choice, and a fourth question covers what we do when the answer is no.

Check One Is Moisture

Wet insulation is the failure that ends most recover plans. Insulation holds water against the deck, and a new membrane laid over it traps that water for years. The weight alone can sag a deck. The moisture also rusts steel panels from above, where nobody looks until a section gives way.

We test before we price. An infrared survey picks out cool, wet zones after sunset, and core samples confirm what the scan shows. If the wet area is small, we cut it out and replace only that insulation before covering the roof. If wet insulation runs across the roof, the overlay is off the table and a full replacement is the safer plan.

Check Two Is the Deck

A deck has to carry the roof it already has plus a new membrane and any added insulation. On a steel deck we look for rust at the flutes, loose fasteners and sagging panels. On a concrete deck we look for cracking and spalling. On wood we look for soft spots and rot.

Older buildings need extra care. Franklin's historic downtown and the Murfreesboro Road corridor hold older commercial buildings than parts of the city to the north, so one test cut tells you little about the next roof over. We open cuts at several locations and record what each one shows.

Check Three Is the Layer Limit

Building codes limit how many roof layers a building can carry, and in Tennessee the rule that governs your roof depends on the jurisdiction and the permit date. We confirm the local edition before quoting. If the roof already has the maximum number of layers, a recover is not allowed no matter how dry it is.

Cities can adopt editions newer than the state's 2021 base, and where the permit office asks for them we provide the roof-assembly details it needs for review.

What Goes Over the Old Roof

A recover is more than a new sheet on top. Most overlays need a cover board or a layer of insulation to separate the old surface from the new one, and the new membrane is fastened or adhered through the old roof into the deck. TPO and PVC are the usual choices because they weigh little and weld at the seams. A metal retrofit is another path on low-slope buildings with sound structure.

Details get raised. Flashings at walls, curbs and penetrations must climb higher to clear the added thickness, and drains need new clamping rings or sump adjustments so water still reaches them. If those details are skipped, a recover can create ponding that did not exist before.

Storm Years Change the Math

Franklin has seen real storm damage. An EF0 tornado crossed Highway 96 near Royal Oaks Boulevard in August 2023 and left minor roof and exterior damage at some businesses along that road. Brentwood sits in the Dixie Alley tornado region, with tornadoes recorded there in December 1988, January 2013 and March 2017.

After a storm, a roof that looked sound for a recover may have torn flashing, lifted seams or wet insulation along an edge. We re-check any roof that has taken a recent storm, document the damage for your carrier, and then decide whether an overlay is still the right plan. A tornado can also leave debris that must be cleared before a new membrane goes on.

Staging an Overlay on a Working Site

An overlay is quieter than a tear-off, and that matters for tenants. There is no demolition debris and less dust, and the old roof keeps the building dry while the new membrane goes down. The trade is more careful layout. Every penetration, curb and drain has to be raised or reworked, so the crew spends more time on details than on open field.

On the retail frontage along Mallory Lane and Royal Oaks Boulevard, curb cuts and heavy peak-hour traffic make deliveries tight, so we stage material early and keep it off the delivery routes. We tell tenants which sections are open each day, keep walkways clear below the work, and close every section at shift end. Any open-flame work on a recover needs a fire watch near combustible materials, which we plan at the start.

Each night we check the work against the weather. If a storm line is coming, we finish and seal edges first and leave field work for another day. A half-finished overlay is a more dangerous roof than either the old one or the new one.

When We Say No

We recommend against a recover when the wet area is wide, the deck is weak, the layer count is at the limit, or the old membrane is blistered and uneven enough to telegraph through the new one. We also advise against it when the roof has chronic ponding from a structural low spot, because a new surface will hold the same water.

In those cases a tear-off costs more now and less over the life of the building. A property manager planning capital years ahead is better served by a roof that resets the clock than by one that adds a layer and a new unknown. Our condition report lays the options out with photographs so the decision is easy to defend.

Commercial Roofing Questions

How much can a recover save?

It saves the tear-off labor and disposal, which is a large share of a replacement. The savings disappear if wet insulation or deck repairs have to be fixed first, so we test before we quote.

Will a recover affect the warranty?

Manufacturer warranties on an overlay depend on the existing roof passing their conditions for dryness and deck soundness. We confirm those conditions with the manufacturer's requirements before we commit to the plan.

Is a recover allowed on my building?

Only if the number of existing layers and the roof's dryness fit the local code. Confirm the adopted edition with the building department, and we will bring the roof details they ask for.

Can a recover go over a metal roof?

Yes, a metal retrofit can go over a sound standing seam or screw-down panel with the right framing. We check the fasteners and panel condition before deciding.

What happens to the drains and edge metal?

Both get reworked. Drain bodies need new clamping rings or sump adjustments so water still finds them, and edge metal is replaced or raised to match the thicker roof. Skipping either detail is how a recover ends up ponding or letting wind under the new membrane.