Commercial roofing Dallas · low-slope & sheet metal
We re-roof Dallas low-slope buildings in TPO and mod-bit, and bend the edge metal ourselves.
Warehouses, strip retail, churches, light industrial. A commercial roofing crew that cuts cores before it quotes, welds seams and probes every one of them before it leaves, and makes the coping and the edge metal on its own brake in the shop on Wendell Road.
- MembraneTPO 60 and 80 mil
- Mod-bit2-ply, torch or cold
- Price basisPer square, after cores
- Edge metalPer linear foot
- Fabrication24 ga / 16 oz copper
- Shop9659 Wendell Rd
01 Commercial low-slope roofing
TPO, modified bitumen and coatings on flat Dallas roofs
A TPO roof in Dallas lives under 100-degree decks for four months a year and gets hail twice a decade. What fails first is almost never the field sheet. It is a seam that was welded cold at 7am, a drain clamping ring with no sealant under it, a pitch pocket somebody filled with mastic, or a parapet where the coping laps were left open and the wall soaked up water behind the membrane.
So we quote from cores, not from a satellite picture. Two to six 4-inch core cuts depending on the size of the roof, plugged and patched the same hour. The cores tell us how many systems are already up there, whether the insulation is wet, what the deck is, and whether the existing assembly can be recovered or has to come off. If a tapered package is needed to get water to the drains, it gets drawn and listed on the estimate as board thickness and slope, not as "tapered as required".
Membrane choice is a building decision, not a preference. TPO at 60 mil for most retail and warehouse work, 80 mil where there is foot traffic to service units. Two-ply modified bitumen where the roof takes abuse, has a lot of penetrations, or where a torch-free cold-applied install is the only way to work over an occupied tenant. Silicone or acrylic coating only over a sound, dry, bonded substrate, and we will say no to a coating over wet insulation every time.
Price basis
Per square of membrane system, edge metal and coping by the linear foot, after core cuts. Insulation is priced by board thickness and R-value, fasteners and plates by the square, and deck repairs are listed by the sheet or by the linear foot of bar joist work. No figure on this site is a quote. Every commercial number is written after somebody has been on your roof with a knife and a tape.
| System | Build-up | Suits | Lead time |
|---|---|---|---|
| TPO mechanically attached | 60 mil, polyiso to the deck, plates and screws, 1.5 in. laps hot-air welded | Warehouse and retail with a steel deck and open interior | 2–3 weeks |
| TPO fully adhered | 80 mil, bonding adhesive over coverboard, welded laps | Rooftop units, regular foot traffic, exposed high-wind corners | 3–4 weeks |
| Modified bitumen, 2-ply | Base sheet plus granulated cap, torch or cold adhesive | Heavy penetration counts, kitchens, churches with odd geometry | 2–3 weeks |
| Silicone coating | Clean, prime, reinforce details, 2 coats to a measured mil thickness | Sound dry membrane with life left and no saturated insulation | 1–2 weeks |
| Standing seam over purlins | 24 ga Galvalume or painted steel, panels run to length, clip fastened | Metal buildings, barns, church roofs, canopies | 3–5 weeks |
What we find on Dallas flat roofs, in the order we find it
- Cold weldsSeams run before the deck warms up, or a machine set at a speed that looked fine. We probe every lap at the end of the day the lap was welded, not at the end of the job, because a Friday probe will not tell you which Tuesday went wrong.
- Drains without slopeWater standing 20 feet from the only drain. Tapered insulation, a new sump and a cast ring fixes it. A coating does not.
- Open coping lapsParapet caps butted together with a bead of caulk. We bend coping in 10-foot lengths with concealed splice plates underneath, so the joint moves and still sheds.
- Pitch pockets full of masticEvery pocket we open is cracked. Where a penetration can be flashed with a welded boot or a fabricated curb and counterflashing instead, we do that.
- Hail bruising on mod-bitYou can feel it before you see it. We cut a sample, photograph it next to a tape, and put it in the report whether or not it helps the quote.
Steep-slope work, shingles, tile and slate are on the residential roofing page. Plenty of commercial buildings have both, and one crew handles both.
02 Custom sheet metal fabrication Dallas
Our brake is on Wendell Road, and it will make a part that fits your building
This is the reason to call us instead of the next commercial roofing company in Dallas. We do not order edge metal from a supply house and bend the building to suit it. A fabricator measures the parapet, draws the profile, and the coil goes through the brake the same week. If the wall is out of plumb by half an inch across 40 feet, the metal is cut to follow it.
Stock in the shop: 24-gauge Galvalume, 24- and 26-gauge painted steel in the standard Kynar color range, 16 oz copper, and stainless where a fastener has to live in a copper assembly. We run drip edge, rake edge, gravel stop, coping caps, chimney crickets, valley metal, counterflashing and reglet, scupper boxes, conductor heads, downspouts, box gutter, curb flashing and standing seam panels. Panels get run to length so a 38-foot slope has no end lap in it.
We also take fabrication orders from other trades. General contractors, HVAC subs who need a curb cap, masons who need through-wall flashing, metal building erectors short a trim piece. Send a drawing with dimensions and bend directions, or ask for a field measure and we will come take it. Orders by the piece or by the linear foot.
Price basis
By the piece or by the linear foot from a drawing or a field measure. Material, gauge, number of bends, girth and finish drive the number. Copper is quoted at the day's coil price because it moves. Shop turnaround on a standard trim run is two to four working days; a copper assembly or a cricket with soldered seams takes longer and we will tell you how long before you commit.
- Materials24 ga Galvalume, 24 and 26 ga painted steel, 16 oz copper, stainless fasteners
- Max lengthTrim bent in 10 ft lengths; standing seam panels run to length
- Seam lock1.5 in. mechanical lock on standing seam, double-locked at the eave
- Coping10 ft caps, concealed splice plates, cleated both sides
- SolderingCopper gutters, crickets and scupper boxes soldered, not riveted and caulked
- DrawingsField measure or your dimensioned sketch; we return a shop drawing to approve
- Turnaround2–4 working days on standard trim; copper work quoted with a date
Fabrication orders
Send a drawing, or ask for a field measure
Tell us the material, the gauge, the girth, the bends and the quantity, or just tell us what the detail has to do and let a fabricator sort out the profile. We quote the piece before we cut anything.
Numbers off the rack
What we keep in the shop, in the units the trade uses
Every figure here is a material specification. None of it is a price, and none of it changes what your roof costs until somebody has measured it.
- TPO field sheet 60 & 80 mil 80 mil wherever boots walk to a rooftop unit
- Weld lap 1.5 in. Hot-air welded, probed at the end of each day
- Steel trim 24 ga Galvalume or Kynar-finish painted steel; 26 ga on light trim
- Copper 16 oz Counterflashing, valleys, crickets, soldered gutter
- Coping cap 10 ft Concealed splice plate under every joint
- Seam lock 1.5 in. Mechanical lock on standing seam panels
- Core cuts 4 in. Two to six per roof, plugged and patched the same hour
- Shop turnaround 2–4 days Standard trim runs; copper assemblies quoted with a date
How a commercial job runs
Six stages, from the first core cut to the warranty paperwork
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Walk and core
Somebody gets on the roof with a knife, a probe, a moisture meter and a camera. Two to six cores depending on area. We map the drains, the overflow scuppers, the units, the gas lines and the parapet condition, and photograph everything that will be argued about later. Cores are plugged and patched before we leave.
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Written estimate, line by line
Membrane type and mil thickness. Insulation by board and R-value. Tapered package if there is one, with slopes. Fastening pattern. Edge metal and coping by the linear foot with gauge and color. Drains, scuppers, curbs, pitch pans. Deck repair allowance. Haul-off and dumpster location. Permit. If it is not on the paper it is not in the price, and nothing is binding until there is a signed contract.
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Submittals and the shop queue
Membrane and insulation get ordered. Metal goes on the shop schedule with a drawing to approve: girth, bends, finish, splice detail. On a tenant-occupied building we agree the work hours, the roof access route and where the hoist sits before the first bundle shows up.
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Tear-off or prep, in sections
We only open what we can dry in the same day. Wet insulation out, deck inspected, rusted-through pan or bad bar joist bearing flagged to the owner in writing with photographs before anything goes back over it. On a recover, the existing surface gets cleaned and the fasteners pull-tested.
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Membrane, metal, details
Insulation and coverboard, field sheet, welds run with the machine and hand-welded at every corner and curb. Then the metal: coping, edge, counterflashing, scupper boxes, curb caps, all of it off our own brake. Every lap probed at the end of the day it was welded. Daily photographs go to whoever is paying.
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Flood or spray test, sweep, close-out
Drains tested, magnet run over the parking lot and the landscape beds, dumpster gone. Close-out package: the probe log, the photographs, the material certifications, the manufacturer warranty registration and the workmanship terms written into your contract. Manufacturer warranties come to you exactly as the manufacturer writes them. We do not restate them in our own words.
What we have made
We bend the flashing in our own shop on Wendell Road. If the wall is out of plumb by half an inch, the metal is too.
Knox Roofing · 9659 Wendell Rd, Dallas
What you can check
Proof a stranger can weigh before signing anything
Knox Roofing is a roofing contractor working across Dallas-Fort Worth out of 9659 Wendell Rd, Dallas, Texas 75243. The shop and the office are the same address. The brake, the coil racks and the finished trim in the photograph above are in that building, and you are welcome to come look at the metal before you hire anybody to install it. Most people do not. The ones who do stop asking who makes our edge metal.
What we put in front of a commercial client, every time, without being asked:
- CoresPhotographs of each core cut with a tape in frame, the plug location marked on a roof plan
- EstimateLine items with material brand, mil thickness, gauge, finish and linear footage, not a lump sum
- Shop drawingYour coping and edge profiles drawn with girth and bends, for approval before the coil is cut
- Probe logWhich laps were probed on which day, signed by the foreman
- Deck findingsWritten and photographed before anything is covered, with the cost of repair stated before we do it
- Close-outMaterial certifications, warranty registration, and the workmanship terms in the contract itself
We do not publish award logos, certification badges or star ratings on this site. Ask us for the addresses of commercial roofs we have done in your part of the metroplex and we will give you ones you can drive past and look at from the parking lot. That is a more useful reference than a badge.
How a Knox crew behaves on your property, what gets covered, what gets swept and who calls you at the end of the day is written out on the how we work page.
Straight answers
The questions building owners actually ask
Including who this is not for. If you want the cheapest number in the stack, we will lose and that is fine.
If the cores come back dry and the existing membrane is still bonded, a silicone coating at a measured mil thickness buys real years and costs a fraction of a tear-off. If one core comes out with saturated polyiso, a coating seals the water in. The insulation stays wet, the R-value is gone, the deck corrodes underneath and the coating manufacturer will decline the claim. We will tell you which one you have and show you the core.
Because the thing that decides the cost of a commercial roof is invisible from the ground and from an aerial image: how many layers are already up there, whether the insulation is wet, whether the deck is sound, how the water is supposed to get to a drain. A number produced without that is a guess with a change order attached. We need roof access, a key or an escort, and an hour.
Usually, yes. We work in sections small enough to dry in the same day, keep tear-off and the dumpster away from entries and drive lanes, and set the hoist or crane outside trading hours where a tenant needs that. Torch-applied mod-bit is the one exception worth discussing: over an occupied space with combustibles below, we switch to cold-applied instead.
Yes. Custom sheet metal fabrication in Dallas is a service we sell on its own, not only as part of a roof. Send a dimensioned sketch with bend directions, or book a field measure. Galvalume, painted steel and 16 oz copper, priced by the piece or the linear foot. We return a shop drawing for approval before the coil gets cut, and we will say if a profile you have drawn will not shed water.
Owners who want a second layer laid over the first to get through a sale. We do not install overlays. Anyone who wants the deductible absorbed in the invoice, which is fraud in Texas and we will not write it. And anyone shopping purely on the lowest square-foot number, because our estimate carries line items that cheaper ones leave out and we will not strip them back out to match.
Two separate things. Our workmanship warranty is written into your contract with its own term and its own exclusions, and you read it before you sign. The membrane manufacturer's warranty is theirs, passed to you exactly as they write it, registered at close-out. We do not paraphrase a manufacturer warranty and we do not promise coverage on their behalf. The terms are summarised on the warranty section of our terms.
No charge, no obligation
Measured roof inspection and a written estimate
A commercial roof inspection in Dallas from somebody who will stand on it. Core cuts, drain check, seam probe, photographs, and a written estimate you can hand to a board or a landlord.
Estimates are not binding quotes. Nothing is fixed until there is a signed contract, and any change to the scope is written and priced before the work happens.
What the inspection covers
- Core cuts, plugged and patched the same hour
- Seam probe and moisture readings across the field
- Drains, overflow scuppers and standing water mapped
- Parapet, coping and edge metal condition
- Photographs of every defect, with a tape in frame
What it is not
- Not an engineer's structural report
- Not an insurance adjustment or a claim filing
- Not a door-knock contingency agreement
- Not a binding price until a contract is signed
Send the details
Tell us the building and what the roof is doing
Square footage, what is on there now, how old you think it is and where it leaks. If this is a fabrication order instead, say that in the specification box and give the material, gauge and quantity.