TPO Roofing Dothan, AL
Honest TPO roofing Dothan AL advice: what the membrane is, when it fits, and when it doesn’t.
- Free inspection with photos
- Quoted price = invoiced price
- AL license #30154
Crews head out from 1881 West County Road 70 each morning.
White TPO reflects sunlight.
TPO roofing Dothan AL property owners ask about is a single-ply thermoplastic polyolefin membrane, usually white, laid over insulation on a flat or low-slope roof and joined with hot-air welded seams. It suits porch roofs, carports, additions and commercial roofs like churches and offices.
It’s the wrong pick for a steep roof, and no membrane fixes a roof that holds water for days. A free inspection tells you which case yours is, with a binding written quote before work starts.
Roll spec · TPO
- Material
- Thermoplastic polyolefin, ASTM D6878
- Thickness
- 45, 60 or 80 mil
- Seams
- Hot-air welded, 1-1/2 in. minimum
- Code slope
- At least 1/4 in. per foot
- Held down
- Adhered, fastened, induction-welded or self-adhered
From GAF, Carlisle and the 2021 IBC, cited below.
Real MAC Construction TPO roofing Dothan AL work: membrane going down and finished roofs.
Send Us the Roof That Holds Water
Tell us about the flat section or building. We check slope, drains, layers and deck before any TPO roofing Dothan AL quote.
- Free inspection with photos
- Binding written quote: quote price is invoice price
- 5-year written workmanship warranty
Or call +1 334-726-6401, answered live 24/7.
Free low-slope roof inspection
What Is TPO Roofing?
TPO stands for thermoplastic polyolefin. Carlisle says its Sure-Weld TPO combines the flexibility of rubber with the heat-weldability of polypropylene, with a polyester scrim between two plies.
The 2021 International Building Code, which Dothan adopted for 2025, lists TPO as a single-ply roof covering under ASTM D6878.
The Three Layers of a TPO Roof
- Membrane. Wide sheets rolled out, seams welded, edges and pipes flashed.
- Insulation and cover board. Flat boards, or tapered boards that build slope toward drains.
- Roof deck. Wood, steel or concrete, checked before anything goes on it.
With one layer of membrane, details carry the roof: seams, edges, drains and pipes. That’s where TPO roofing Dothan AL crews earn their pay.
Who Needs TPO Roofing in Dothan and Houston County?
TPO roofing Dothan AL jobs fall into two groups: the low part of a house, or a whole commercial roof.
Porch Roofs, Carports and Additions
Under 2021 IRC Section R905.2.2, shingles can’t go below 2:12. Flat porch roofs and additions need a membrane, often a welded TPO sheet tied into the shingles.
Nearly Flat Home Roofs
Many manufactured homes have very low-slope roofs. See our manufactured home roofing page.
Churches, Offices and Shops
Wide roofs with drains and HVAC curbs are TPO’s home turf. Our commercial roofing page compares systems; this page covers TPO roofing Dothan AL owners need in depth.
Why a White Roof Makes Sense in the Wiregrass
The Cool Roof Rating Council says a cool roof reflects sunlight and sheds absorbed heat, and rates products for solar reflectance and thermal emittance. For TPO roofing Dothan AL buildings, ask for the product’s CRRC listing, not a vague “energy saving” promise.
TPO Roofing Dothan AL Checker: Is It Right for This Roof?
Answer four questions for plain-English advice based on the code and manufacturer rules cited here.
Pick an answer to start
- Each answer adds a plain-English note here.
Guidance only; an inspection confirms it.
What Decades of Flat Roofs Actually Teach You
Stephen McDuffie started roofing in 1985 and founded MAC Construction in August 1991. His flat-roof work includes single-ply glue-down, peel-and-stick and heat-weld jobs on churches, doctors’ offices and apartment complexes. His proudest project: a six-story apartment building off Racetrack Road in Fort Walton Beach, FL.
This is not a claim to be the best at TPO roofing Dothan AL has. It’s what 6,000+ roofs since 1991 taught us: on a flat roof, water finds the one lap nobody checked. The video is a real MAC Construction project.
“A Great Roofer will not cut corners to get a job.”Stephen McDuffie, founder and owner
Watch: Real MAC Construction Project Video
45, 60 or 80 Mil: Which TPO Thickness Fits?
A mil is a thousandth of an inch: 45-mil TPO is 0.045 in. thick. GAF and Elevate (formerly Firestone) both make 45, 60 and 80 mil, and thicker sheets qualify for longer guarantees.
- 45mil · 0.045 in.GAF guarantee options up to 20 years
- 60mil · 0.060 in.GAF guarantee options up to 25 years
- 80mil · 0.080 in.GAF guarantee options up to 30 years
GAF EverGuard TPO fleece-back data sheet. Guarantees carry conditions and aren’t a promised lifespan.
Why “Class 4” Doesn’t Apply to TPO
Class 4 is a UL 2218 impact rating for steep-slope products like shingles. It doesn’t describe a TPO membrane, so honest TPO roofing Dothan AL quotes shouldn’t claim it.
How TPO Hail Performance Is Rated
Membranes go through FM Approvals hail classes; Elevate reports FM Very Severe Hail approval on 500+ UltraPly TPO assemblies. Carlisle’s warranty needs 60-mil adhered to a cover board for 1-inch hail coverage, 80-mil for 2-inch.
Get the thickness in writing on any TPO roofing Dothan AL quote. One that just says “TPO” lets anyone use the thinnest sheet.
TPO Roof Installation: How the Seams Get Welded
Sheets overlap about 2 inches and a hot-air welder fuses them; Carlisle’s specifications call for a weld at least 1-1/2 inches wide.
A cold weld looks fine and opens later, so every TPO roof installation we do ends with probing the seams.
Four Ways the Membrane Is Held Down
GAF publishes specs for adhered, induction-welded, mechanically attached and self-adhered TPO. Deck, wind exposure and the maker’s spec decide which a roof gets.
Fully Adhered
Adhesive glues the sheet to the cover board.
Self-Adhered
Peel the liner, set the sheet, weld the seams.
Mechanically Fastened
Plates and screws at the laps, welded over.
Induction-Welded
Screwed-down plates heated through the sheet to bond it.
What TPO Roofing Dothan AL Quotes Should List
- Membrane brand and thickness in mil
- How it’s held down
- Insulation, cover board, tapered or flat
- Tear-off to the deck, or recover
- Edge metal, drains and flashing details
- Which warranty, from whom
TPO vs EPDM, PVC and Modified Bitumen
All four are legitimate low-slope systems. For TPO roofing Dothan AL buyers, this table sticks to properties the makers and the code publish.
| Property | TPO | EPDM | Modified bitumen | PVC |
|---|---|---|---|---|
| What it is | Thermoplastic polyolefin, one ply | Synthetic rubber (thermoset), one ply | Polymer-modified asphalt sheets (SBS or APP), built up in plies | Polyvinyl chloride thermoplastic, one ply |
| Material standard (2021 IBC) | ASTM D6878 | ASTM D4637 | ASTM D6162, D6163, D6164 and others | ASTM D4434 |
| How seams are joined | Hot-air welded, 1-1/2 in. minimum weld | Primer plus splice tape | Heat-welded, torched, mopped, cold-applied or self-adhered laps | Hot-air welded, 1-1/2 in. minimum weld |
| Usual surface | White, tan or gray | Black (white sheets are also made) | Granule-surfaced cap sheet | White, gray or tan |
TPO vs EPDM in Dothan’s Sun
TPO vs EPDM comes down to seams and color: TPO welds with heat and is usually white; EPDM joins with primer and tape and is usually black. In our sun we lean toward white and welded, but drainage matters more than the label. Considering metal? See metal roofing.
Low-Slope Roofing Rules: Slope, Ponding and Rain
Flat roofs aren’t truly flat. For low-slope roofing, 2021 IBC Section 1507.12.1 and IRC Section R905.13.1 require at least 1/4 inch of slope per foot for single-ply membranes. Reroofing is exempt from that minimum if the roof still drains (IBC 1512.1).
NRCA’s test: no ponding water should remain 48 hours after a rain, in drying conditions (NRCA, Professional Roofing).
How a Ponding Roof Gets Fixed
With about 54 inches of rain a year, fixes we weigh before any TPO roofing Dothan AL job:
- Tapered insulation
- Crickets between drains
- Added drains or scuppers
- Deck repair at low spots
Leaking now? Start with roof leak repair.
Flat Roof Replacement or Recover?
A recover puts new TPO over the old roof. A flat roof replacement tears everything down to the deck. The 2021 IBC (Section 1512.2.1.1; renumbered 1512.3 in the 2024 edition) and, for houses, IRC Section R908.3.1.1 bar a recover when:
- The old roof is water-soaked or too deteriorated to build on
- The old roof is slate, clay, cement or asbestos-cement tile
- The roof already has two or more layers
GAF’s guarantee matrix limits recovered roofs to 20 years of coverage; longer terms need new construction or a full tear-off.
Before any TPO roofing Dothan AL recover, we check layers, deck and wet insulation. For budgets, see our roof replacement cost guide.
TPO Warranties and License Checks
A TPO roofing Dothan AL job can carry two different warranties. Know which is which.
Workmanship
- 5-year written warranty on our work
- Covers how the roof was installed
- Comes from us, in writing
Manufacturer Guarantee
- GAF requires its certified commercial contractors for eligibility
- Standard GAF coverage: wind up to 55 mph
- Hail and puncture coverage only if purchased
License Check
- MAC: Alabama license #30154, verify at hblb.alabama.gov
- Commercial jobs of $100,000+ need a state general contractor license (Act 2024-277)
Ask every bidder, us included, which manufacturer guarantee they can register, in writing. 0% APR offers for qualified buyers through Enhancify, subject to credit approval; terms vary. See roofing financing and verifying a license.
Get Your Dothan Low-Slope Roof Checked and Priced
We schedule a free inspection, then send photos and a binding written quote, so you know if TPO roofing Dothan AL owners rely on fits your roof.
Or call or text +1 334-726-6401, answered live 24/7. Details on our free roofing estimate page.
Free inspection and binding quote
What Dothan Customers Say
Real reviews, quoted exactly.
“Mac Construction recently completed the roofing on our church, and we couldn't be more satisfied with their work. Their crew was on time, worked quickly without sacrificing quality, and showed great care and professionalism throughout the project. The finished roof looks excellent, and the whole experience was stress-free.”
“Incredible Work, would Highly recommend!”
“MAC Construction is the best! Hands down!”
“Great owners”
Read more on our reviews page, or find MAC Construction on:
Low-Slope and Commercial Work Around the Wiregrass
Each morning crews leave our West County Road 70 yard for jobs across Dothan and Houston County, AL, and towns like Headland, Ozark and Enterprise. Most TPO roofing Dothan AL work starts with a roof inspection or a roof repair visit. More in the project gallery.
TPO Roofing Dothan AL Questions
What is TPO roofing?
TPO (thermoplastic polyolefin) is a single-ply roof membrane, usually white, laid over insulation on a flat or low-slope roof. Its seams are hot-air welded, so the roof acts as one sheet.
How is TPO roofing Dothan AL pricing set?
Size, thickness, insulation, tear-off and drains all move the price, so we don’t post one. You get a free inspection and a binding written quote: quote price equals invoice price.
Can TPO go on a house?
Yes, on low-slope parts. Porch roofs, carports and additions below 2:12 can’t take shingles under the residential code, and TPO is a common fix. Steep roofs suit shingles or metal.
Is TPO rated Class 4 for hail?
No. Class 4 comes from UL 2218, a test for steep-slope products such as shingles. TPO systems are rated through FM Approvals hail classes, and manufacturer hail coverage depends on membrane thickness and cover board.
Can a new TPO roof go over my old flat roof?
Sometimes. Code bars a recover over a water-soaked or deteriorated roof, slate or tile, or two or more existing layers. GAF also caps recovered roofs at 20-year guarantees.
How long does a TPO roof last?
No honest roofer can promise a number. Manufacturer guarantees run up to 20, 25 or 30 years by thickness, with conditions. Drainage, seams and upkeep decide real service life.
Code references: 2021 IBC and 2021 IRC as adopted by the City of Dothan. Details on our Alabama building code page.
Ready to Roll Out a Roof That Drains?
Get TPO roofing Dothan AL advice in writing: free inspection, photos and a binding quote from a local Alabama roofer at 1881 West County Road 70 since 1991. Meet the owner on Stephen’s page.
