Metal Roofing Alliance Member
TVA Preferred Partners Network
Music City Specialists
Nashville, TN
Licensed & Insured
BBB A+
.avif)
Call Anytime
(615) 649-5002Start Designing
YOUR NEW ROOF
YOUR NEW ROOF
A complete guide to TPO roofing for commercial buildings in Nashville. Inspection, repair, replacement, restoration, and leak diagnosis for flat and low-slope roof sections. How TPO compares to metal, PVC, and EPDM and what a TPO roof costs in 2026, from a licensed Nashville contractor with 20+ years on commercial roofs. We install, repair, and restore TPO. We do not sell membrane or materials.
TPO (thermoplastic polyolefin) is a single-ply membrane for flat and low-slope commercial roofs, installed at 60–80 mil thickness with hot-air welded seams. In Nashville, full TPO replacement typically runs $800–$1,200 per square ($8–$12 per sq ft) as of June 2026, depending on size, insulation, and tear-off. We inspect, repair, replace, and restore TPO on roof sections with as little as ¼:12 of slope, including hybrid buildings that pair metal on the steep planes with TPO on the flats. Also called single-ply roofing, thermoplastic membrane, or flat roof membrane.
TPO is not a coating and not a patch product. It is a complete membrane system: insulation, cover board where specified, membrane, welded seams, and terminations, engineered as one assembly. When one part of that assembly is wrong, the roof leaks, which is why we treat inspection and seam testing as seriously as installation.
We do not sell TPO rolls, membrane, adhesives, fasteners, or accessories. If you need materials for a DIY project, a commercial roofing distributor can help. If you need a flat roof inspected, repaired, replaced, or restored by a licensed Tennessee contractor, that is what we do every week.
TPO seams are fused with hot air into one continuous sheet, while EPDM relies on seam tape and adhesives that age and can peel. TPO's white surface also reflects Nashville's summer sun, keeping the roof surface and the space below it cooler.
EPDM ships in very large sheets, up to 50 feet wide, so open roofs can be covered with few seams. It has decades of field history, stays flexible in cold weather, and can be the economical call on simple, unobstructed decks where heat gain is not a concern.
Slope is measured in inches of rise per 12 inches of run. Snap-lock standing seam generally needs 3:12. Mechanically seamed standing seam can go as low as ½:12. Exposed-fastener panels need at least 1:12 with sealed laps. Once a roof section drops below those numbers, code and physics both point to a membrane: TPO installs down to the IBC minimum design slope of ¼:12.
Typical minimum slopes per manufacturer specifications and the International Building Code. Below ¼:12, no roof system is code compliant; sections must be built up or tapered to drain.
A commercial TPO roof is a layered assembly, not just a sheet. Over the structural deck goes insulation, usually polyiso, then a cover board where the spec calls for one, then the membrane itself, mechanically fastened or fully adhered. Every seam is hot-air welded, every edge is terminated with metal, and every penetration gets a welded boot or field-fabricated flashing.
The classic Nashville setup: standing seam over the front, flat roof over the back. We handle both sides, so the transition where metal meets membrane, the most leak-prone detail on the building, is designed and flashed by one contractor instead of two.
Wide, uninterrupted low-slope decks are where TPO is most economical. Large rolls mean fewer seams per square foot, faster installation, and a white surface that reflects summer sun instead of soaking it in.
RTUs, curbs, gas lines, condensate drains, and conduit turn a roof into an obstacle course. Welded TPO boots and field-fabricated flashings seal around all of it, and walk pads protect the paths technicians actually use.
Additions rarely match the original roof pitch. Where a new flat section ties into an existing metal or shingle roof, TPO handles the low side and we detail the tie-in so water has one continuous, welded path off the building.
Use both. Metal on every section with real slope, TPO on the flats, with the transition detailed by one contractor. That hybrid approach is what we install and service most on Nashville commercial buildings, and it puts the right material, and the right budget, on each part of the roof.
Restaurants with rooftop exhaust, and any roof that sees animal fats or chemical fallout, favor PVC. Plasticizers give PVC resistance to grease that degrades TPO over time, so for heavy-exhaust roofs PVC is often the better spec, at least over the fan zones.
TPO typically installs for less than PVC at the same thickness, which is why it dominates warehouses, retail, and office flats. When a roof has no special chemical exposure, stepping up to PVC rarely buys anything the building needs.
Both membranes hot-air weld, and both patch cleanly for years. Aged TPO needs more surface prep before a patch will fuse, while older PVC tends to stay weldable later in life. Either way, weld quality comes down to the technician, not the logo on the roll.
TPO is the volume leader on Middle Tennessee commercial roofs, so matching membrane, accessories, and future repair stock is simpler. PVC remains the specialty answer for restaurants and industrial exposure. If your building genuinely needs it, we will say so during the assessment.
For most Nashville commercial buildings the deciding factor is heat. A black EPDM roof over conditioned space works against the air conditioning from May through September, while white TPO reflects most of that load. When we replace an aging EPDM roof, the switch to TPO is usually the easy part of the recommendation.
Some older EPDM roofs are ballasted with river rock rather than fastened or adhered. Ballast has to be removed and disposed of before any replacement, which adds labor and can shift the budget conversation. We flag it during inspection so the estimate carries no surprises.
The practical differences show up at installation and in summer. Torch-applied mod-bit puts open flame on the roof, which many owners and insurers now prefer to avoid, while TPO welding uses electric hot air. Mod-bit surfaces are dark or granulated and absorb heat; TPO stays white and reflective. Multi-ply mod-bit is heavier and slower to install, though its redundancy makes it forgiving of minor surface damage.
When an existing mod-bit roof reaches the end of its life, we typically recommend replacing it with TPO rather than another asphalt system: lighter, cooler, faster to install, and easier to repair with a welded patch. Where the existing plies are dry and well adhered, they can sometimes stay in place beneath the new assembly, which trims tear-off cost.
Thermal imaging and core cuts tell us whether the insulation is dry. Isolated wet areas can be cut out and replaced before restoration. Widespread saturation means replacement, because no coating fixes a roof that is wet underneath.
We probe seams across the field, not just at the edges. Tight welds with isolated failures favor repair or restoration. Systemic seam failure, especially on older membrane, points to replacement.
TPO wears from the top down. If the weathering layer still has healthy thickness and the sheet stays flexible, restoration extends it. Crazing, shattering at folds, or exposed scrim means the membrane is done.
Restoration costs less up front; replacement resets the clock for decades. We price both when a roof genuinely sits on the line, and show the math per year of expected service so the decision is yours with real numbers.
Every replace-or-restore recommendation we make is backed by a documented inspection: photos, thermal scan, seam probing, and core cuts where needed. If restoration is the better answer for your building, we will say so, even when replacement would be the bigger ticket.
Cold welds, fishmouths, and unbonded laps let water in at the joints. Flashings at walls, curbs, and edge metal fail as sealants age and membrane pulls. These are the first places we probe on every inspection, and the most common repair we weld.
Dropped tools, screws underfoot, and equipment dragged across the field puncture single-ply membrane easily. HVAC service traffic is the usual culprit, which is why walk pads around units pay for themselves many times over.
Clogged drains and crushed insulation create ponds that stress seams and age the sheet. Building movement and thermal cycling pull at fasteners and bridged details. And bad previous repairs, caulk smeared over a seam instead of a proper weld, often cause the very leak they were meant to fix.
We inspect the existing roof, moisture-scan for wet insulation, verify drainage, and measure everything: field, curbs, penetrations, edge metal. The scope defines tear-off versus recover, insulation thickness, and attachment method before anything is priced.
Failed roofing and wet insulation come off; sound substrates are cleaned and prepped for recover where code and conditions allow. Deck repairs happen now, because nothing above the deck can fix a problem below it.
Polyiso insulation is mechanically fastened or adhered to spec, tapered where the roof needs help draining. A cover board goes down where the spec calls for it, adding puncture resistance under the membrane.
TPO sheets are rolled out, positioned to put seams with the water flow, and attached per the engineered spec for the building, mechanically fastened in the laps or fully adhered.
Every seam is fused with calibrated hot-air welders. Temperature and speed are dialed in with test welds each morning and rechecked as conditions change, because weld quality is the single biggest factor in how long the roof lasts.
Penetrations get welded boots or field-fabricated flashings. Walls and curbs are flashed up and terminated. Edge metal and coping lock down the perimeter, the part of the roof wind attacks first.
Every seam is probe-tested, details are checked against the spec, and walk pads go down around units and along service routes. You get photo documentation of the finished roof and its details.
We document the condition that drives the recommendation: moisture scans, seam probes, core cuts, and photos, so you are deciding from evidence rather than a sales pitch. When a repair will genuinely carry the roof a few more years, we will tell you that too, along with what to watch.
A 10,000 sq ft TPO replacement typically lands at $80,000–$120,000. A 20,000 sq ft roof runs $160,000–$240,000, and a 50,000 sq ft warehouse deck spans $400,000–$600,000, all as of June 2026 and all moved by the same variables above.
Two ways to manage the number: phase the work by roof section when drainage allows, or restore instead of replace when the assembly below is dry and sound. A silicone restoration on a qualifying TPO roof costs a fraction of replacement and defers the capital project by years. We price both paths when a roof qualifies.
Office buildings, retail strips, restaurants, and medical suites: flat sections over conditioned space where a leak means damaged interiors and closed rooms. White TPO keeps rooftop units working less in July, and welded details stand up to the service traffic these roofs see.
Warehouses, distribution, and light industrial are TPO's home field: large open decks where big rolls, few penetrations, and mechanical attachment install efficiently. Multifamily buildings with flat sections round out the list; common-area leaks there involve tenants, so drainage and detail quality matter double.
Homes show up in this work more than people expect: flat-roof additions, porch and carport roofs, mid-century designs, and garages sitting below the slope range where shingles and most metal panels are allowed. TPO handles those sections cleanly.
On hybrid homes we pair the systems: metal on the visible, steep planes and TPO on the flat sections behind or between them, with the transition flashed as one continuous detail. One contractor for both sides means one warranty conversation and no finger-pointing at the seam.
We install 60 mil TPO as our standard and 80 mil as the heavy-duty upgrade for roofs with equipment traffic or owners planning to hold the building long term. Thinner 45 mil membrane exists in the market; we do not recommend it for Nashville commercial roofs and do not install it.
The Metal Roofers is a licensed, family-owned roofing contractor based in Nashville, Tennessee, holding Tennessee Contractor License #75515. Over more than 20 years, the company has installed and restored over 1,000 metal roofs across Nashville and Middle Tennessee, and holds an A+ rating with the Better Business Bureau. The record can be verified on the BBB profile and the MetalRoofing.com contractor profile.
This page is written and maintained by the commercial roofing team at The Metal Roofers in Nashville, Tennessee.
The membrane standards, ratings, and figures cited on this page are defined by independent authorities: the Cool Roof Rating Council for solar reflectance and thermal emittance ratings, ENERGY STAR for reflective roof product criteria, the U.S. Department of Energy Cool Roofs program, ASTM International for membrane standards and test methods, FM Approvals for fire and wind rated assemblies, and Metro Nashville Codes Administration for adopted building codes including the two-layer roof rule.
Warranty terms vary by manufacturer, system, and attachment method, and most require registered details and periodic maintenance to stay in force. We spell out the exact warranty on every proposal rather than quoting a generic number.
A structurally sound TPO roof near the end of its warranty does not have to be replaced. If the insulation is dry and the seams hold, a silicone restoration system renews the surface, reseals every detail, and typically carries its own 10–20 year warranty for a fraction of replacement cost.
That is the long game we design for: install the membrane right, maintain the details, then restore instead of tearing off when the surface ages. Owners who follow that cycle spend dramatically less per decade of dry building than owners who replace on repeat.
Between $800 and $1,200 per square, which is $8–$12 per square foot installed, as of June 2026. A 10,000 sq ft roof typically lands between $80,000 and $120,000. Tear-off, insulation spec, attachment method, and detail density move a project within that range. Aging membrane but a sound roof? Silicone restoration costs a fraction of that.
TPO is thermoplastic polyolefin: a single-ply membrane of polypropylene and ethylene-propylene rubber, reinforced with a polyester scrim. It ships in wide rolls, is white and reflective by default, and its seams are fused with hot air rather than glued. For the sloped sections of the same building: commercial metal roofing.
No. We are a licensed roofing contractor, not a supplier. We do not sell TPO rolls, membrane, adhesives, or accessories, and we do not support DIY installation. We inspect, repair, replace, and restore commercial TPO roofs.
Nashville and Middle Tennessee. Our commercial work runs throughout Davidson County and the surrounding counties, from downtown buildings to the warehouse parks outside the loop. See finished projects: our gallery.
The dividing lines are moisture and seams. Dry insulation with isolated seam or flashing failures points to repair. Widespread wet insulation, systemic weld failure, or brittle membrane points to replacement. We verify with thermal imaging, seam probing, and core cuts, then show you the evidence.
Often, yes. A structurally sound TPO roof with dry insulation and intact seams can be restored with a silicone coating system for a fraction of replacement cost, typically with its own 10–20 year warranty. Wet insulation or failing welds disqualify a roof until they are corrected. Full coverage map: areas we service.
White TPO reflects most of the solar load that a dark roof absorbs, which lowers rooftop temperatures and reduces summer cooling demand in conditioned buildings. Reflectance ratings for specific membranes are published independently, so the numbers are checkable rather than marketing. Ready for an honest answer? Schedule an assessment.
Sometimes. Code allows one recover if only a single roof layer exists and the assembly below is dry and sound. A recover trims tear-off and disposal cost, but wet insulation or a second existing layer requires full removal. A moisture scan settles the question before we quote. How restoration works: our roof coating systems.
It depends on size, tear-off, weather, and detail density. A small commercial roof may take days, while a large warehouse runs longer in phases. We sequence the work so the building stays watertight every night, and the proposal includes a schedule rather than a guess. Look up rated products: Cool Roof Rating Council.
Two layers of coverage: a manufacturer membrane warranty, typically 15–30 years depending on thickness and system spec, and our workmanship warranty on the installation itself. Most early problems on flat roofs are workmanship, so that second layer matters. Planning the metal sections too? Commercial metal roofing in Nashville.
Standing water is the most common warranty exclusion in the fine print. TPO tolerates slow drainage better than most systems, but persistent ponds age the sheet, stress seams, and give manufacturers an exit. We correct drainage with tapered insulation, added drains, or sump adjustments as part of the work. What owners say about working with us: 150+ Google reviews.
Twice-yearly inspections plus a check after major storms: clear drains and scuppers, probe suspect seams, reseal terminations as needed, and document conditions with photos. Keep HVAC technicians on walk pads and require anyone working up there to report dropped fasteners or damage. The workmanship side: our lifetime workmanship warranty.
Yes. Commercial roof replacement is a capital expense, and spreading it over time often makes more sense than deferring the work while the deck takes on water. Options and terms: financing options.
That hybrid is our specialty: metal panels on the steep, visible slopes and TPO on the flat sections, with the transition between them flashed and warranted by one contractor. Most Nashville commercial buildings with mixed rooflines end up exactly there. The steep-slope half: standing seam metal roofing.
With caution. Animal fats and grease from kitchen exhaust degrade TPO faster than other exposures, which is why PVC is often specified over exhaust areas. On restaurant roofs we look hard at the fan zones and either recommend PVC there, add sacrificial protection, or plan more frequent inspections.
Start with an assessment. We will inspect the membrane, probe the seams, scan for trapped moisture, and give you an honest read: repair, restore, or replace, with real numbers for each path that makes sense.
Nashville & Middle Tennessee · Licensed & Insured · BBB A+ Accredited