EPDM Roofing
Rubber sheets flash more easily around crowded pipe stacks and HVAC curbs, so EPDM can beat TPO on cluttered roofs.
EPDM roofing in CottonwoodCottonwood TPO Roofing Contractor
We install, repair, and replace heat-welded TPO roofs as a TPO roofing contractor serving Cottonwood retail, office, and medical buildings. Every weld gets probed before we leave the roof.
Welding Machine
Lap Cleaning
Curb Flashing- Seam MethodHot-air welded laps
- Sheet ColorsWhite, tan, or gray
- Best SlopeFlat and low-slope decks
- Typical LifeAbout 20 to 30 years
Does Your Roof Fit A TPO Membrane?
TPO earns its place on flat roofs over cooled space. A few roof types are better served by rubber or metal.
Where TPO Works
- Flat retail, office, and medical roofs with a few rooftop units
- Roofs over air-conditioned space where a white sheet cuts heat gain
- Decks with dry insulation that can take a recover
- Open roofs where storm-driven water crosses long seams
- Sedona buildings that need a tan or gray membrane
Where Another System Fits Better
- Pitched shop roofs that shed water faster under metal panels
- Decks packed with pipe stacks, where taped EPDM flashes more easily
- Roofs that already carry two layers and need a full tear-off first
- Plant roofs venting chemicals that call for an exposure check
- Standing-seam panels still tight at their laps
Problems We Find On TPO Roofs
TPO trouble almost always starts at a weld or a curb. These are the five conditions we see most on Cottonwood roofs.
Seam edges peeling up
Likely CauseWelds made too cold or over a dirty lap never fused, and daily heating and cooling pulls them apart.
What We DoWe clean the lap, reweld it with a hot-air welder, and probe the full length of the seam.
Leak under a rooftop unit
Likely CauseCurb flashing shrank or split at the corners where the membrane turns up the side of the unit.
What We DoNew TPO flashing gets welded around the curb with preformed corners in place of cut patches.
Chalky, thin surface
Likely CauseYears of high-desert UV wore down the top layer of an older sheet until the scrim shows through.
What We DoCore cuts check what membrane is left, and worn areas get new TPO welded in.
Puddles that stay for days
Likely CauseInsulation crushed by foot traffic, or drains set higher than the deck around them.
What We DoTapered insulation and drain sumps go in during the repair or replacement.
Membrane lifting at the edge
Likely CauseMonsoon gusts get under loose edge metal and work the perimeter fastening loose.
What We DoWe refasten the perimeter and weld a cover strip over the new edge metal.
Your TPO Options In The Verde Valley
Moisture readings and a look at the laps decide which of these four paths your roof takes.
| Option | When It Fits | What We Do |
|---|---|---|
| Seam and curb repair | Dry insulation with a few open laps or split curb corners | Clean, reweld, and probe the laps; weld new curb flashing |
| Recover over the old roof | One existing layer, with dry boards confirmed by moisture readings | Fasten cover board and new TPO through to the deck |
| Tear-off and replace | Wet insulation across large areas, or two layers already in place | Strip to the deck, add tapered insulation, and install new TPO |
| Sheet color choice | White inside Cottonwood; tan or gray under Sedona reflectance caps | Order the color that meets the town rule before install |
What A TPO Roof Gives Your Building
Here is how a TPO roof reads on the deck before we start and once the welds are probed.
Before The Work
- Peeling laps at the end of each seam run
- Water staining ceiling tiles under rooftop units
- A dark, heat-soaking roof over cooled space
- Puddles sitting by the drains after storms
- Old patches stacked around pipe penetrations
After The Work
- Welded laps probed along their full length
- Curbs wrapped in welded TPO flashing
- A white sheet over cooled space, or a tan sheet in Sedona
- Tapered insulation moving water to the drains
- Pipe boots welded into the field sheet
Welds Opening Along Your Seams?
Call and tell us how many seams you see lifting and where the nearest rooftop unit sits. That tells us how to stage the repair.
Call UsHow We Install And Repair TPO Roofs
Each TPO job moves from testing the old laps to probing the new ones, one roof section at a time.
Inspect Your Roof
A seam probe runs along the old laps while a moisture meter checks the field. Wet readings get a core cut so we can see the insulation itself.
Choose Repair Or Recover
Open laps over dry boards get rewelded. A dry roof with one layer can take a recover, and wet insulation sends that section to tear-off.
Prepare And Taper
Tapered insulation is laid toward each drain and fastened with plates, so water stops sitting in the low corners of the deck.
Weld The Sheets
Rolls go down with overlapping laps, and an automatic hot-air welder fuses each seam at a set heat. Curbs, pipe boots, and inside corners get hand-welded flashing.
Probe And Walk
Every new weld is probed by hand, and you walk the roof with us to see drains, curbs, and edge metal before the section is signed off.
Other Systems Worth Comparing
Two other roof systems come up often when owners price TPO for a Cottonwood building.
Industrial Roofing
Plants and warehouses with exhaust fans and heavy foot traffic need walkway pads and phased TPO work across big decks.
Industrial roofing in CottonwoodTPO Roofing Questions
Answers about welded TPO membranes on Verde Valley commercial roofs.
Is TPO a good choice for a flat commercial roof in Cottonwood?
Often, yes, for low-slope retail, office, and medical buildings. TPO is a single-ply membrane with heat-welded seams, and those seams hold when summer storms push water across the roof.
Color is the usual local caution. White helps cooling loads in Cottonwood, but the Sedona Land Development Code prohibits white or reflective roofs, so tan or gray membranes go there.
How are TPO seams joined?
Hot air fuses the two sheets into one piece of plastic at each lap. An automatic welder runs the long field seams, and a hand welder with a silicone roller handles curbs and corners. We probe every weld afterward to catch any gap before it lets water in.
Can TPO go over my existing roof?
When the old roof has one layer and dry insulation, yes. Moisture readings and a core cut confirm the boards are dry, then cover board and new TPO are fastened through to the deck. Wet areas get cut out first, and two existing layers mean a full tear-off.
Why does my TPO roof leak near the HVAC unit?
Curb flashing is the weak spot on most TPO roofs. The membrane turns up the side of the curb, and when the corners were cut and patched instead of preformed, they split as the roof heats and cools. New welded flashing with preformed corners fixes it.
Does a white TPO roof stay white?
Dust and pollen dull it over time, which lowers how much heat it reflects. Rinsing the roof during routine inspections brings back most of the brightness. Sedona roofs skip the question entirely, since tan or gray sheets are used there to meet the reflectance limits.
What thickness of TPO should a commercial roof use?
Thicker sheets hold up better to foot traffic and hail, and they leave more material to weld into on future repairs. We match thickness to rooftop traffic and the number of units on the deck, and the choice is written into the scope.
What drives the cost of a TPO roof?
Roof size sets the base, then the work underneath moves it most. Wet insulation that must come out, tapered insulation to fix ponding, the number of curbs and pipes to flash, and sheet thickness all add labor or material. A recover over a dry roof costs less than a full tear-off.
Call A Cottonwood TPO Roofing Contractor
Send us the roof size and what you see at the seams, and the first visit starts with a probe test on the old laps.