What Commercial Roofing Involves on a Low-Slope Deck
Most Dallas buildings sit under a low-slope deck, so our crews work membranes and drainage rather than shingles. System selection comes first, because a white single-ply and a gravel-surfaced assembly age very differently under Texas sun.
- TPO (thermoplastic polyolefin) at 60 to 80 mil is the white single-ply we install most often on warehouse and retail rooftops.
- EPDM (ethylene propylene diene monomer) at 45 to 90 mil handles hail and foot traffic, though black rubber runs hotter in July.
- Modified bitumen comes torch-applied or self-adhered, and we choose between them based on deck type and building occupancy.
- Built-up roofing (BUR) layers asphalt and roofing felt over a substrate, and it still fits some older Dallas rooftops.
- PVC membrane resists grease and kitchen exhaust, which makes it the usual pick above restaurants.
- Standing-seam panel in 24-gauge steel with a Kynar coating sheds water fast where a membrane meets a pitched section.
- Metal panel over purlins covers canopies, awnings, and mansard or gambrel sections that a single-ply cannot wrap.
- Reflective coating buys a few more years on a sound membrane by cutting heat gain and slowing UV degradation.
Signs You Need Work Before the Next Storm
Dallas hail season runs March through June, and most July failures started in May. Ponding water that sits more than 48 hours after rain is the first thing we flag.
- Water ponding on the membrane long after the rain stops, which points to a clogged scupper or a settled deck.
- Interior water stains on ceiling tiles that line up with column lines, where a seam has opened.
- Blistering or alligatoring across a field of membrane, a sign the bitumen has oxidized and is peeling from the substrate.
- Rust streaks along parapet coping, where counter-flashing has pulled away from the wall.
- Thermal cycling that separates seams at the lap and cracks them open over a single summer.
- Hail bruising on metal panels, which leaves low spots that then hold water.
- Wind uplift at corners and edges after a convective storm, where ballast has shifted or fasteners have backed out.
- Granule loss on an aging modified bitumen cap sheet, which exposes the bitumen underneath to direct sun.
- A skylight that has fogged or cracked, one of the most common leak sources on older rooftops.
- Gutter and downspout lines that cannot move storm volume away from the building fast enough.
How Our Process Runs, Step by Step
Every project starts with a roof asset survey rather than a sales pitch. We walk the deck, map the drains, and photograph each deficiency before anyone talks numbers.
- Roof asset survey, where we measure square footage, record roof pitch, and document existing layers.
- Specification review, where we match membrane type, insulation value, and attachment to Dallas building code.
- Moisture testing, using infrared and moisture meter readings to find wet insulation hiding under a dry membrane.
- Tenant notification, where we coordinate access windows with property managers so business keeps running.
- Tear-off or recover, stripping to the roof deck where plywood or OSB sheathing has rotted, or overlaying where it has not.
- Deck repair, where new plywood, a vapor barrier, and rigid insulation go down before any membrane touches the roof.
- Membrane install, laid in staggered courses with sealed laps and fastened at the rate the manufacturer requires.
- Flashing detail, where parapet counter-flashing, pipe boots, and scupper details get hand-sealed with mastic.
- Structural check, where we look at the truss, rafter, and joist bays for sag and watch for a ridge beam that has settled.
- Final inspection and debris removal, sweeping for fasteners with a magnet and hauling the dumpster out.
Crews run a ladder, nail gun, and air compressor up before tear-off, along with a pry bar, roofing shovel, and roofing squares for layout.
A torch stays on site for modified bitumen, and roof cement, sealant, caulk, and adhesive ride on the cart for detail work.
Details We Check on Every Roof
Small details decide whether an assembly lasts, and they are cheap to fix while the membrane is already open.
- Step flashing where a wall meets the field, and chimney flashing around any masonry penetration.
- Apron flashing and boot flashing at curbs, plus pipe flashing at every pipe boot and vent boot.
- Drip edge, fascia, rake, and overhang condition on pitched sections above the low roof.
- Ridge, ridge cap, and ridge vent on the pitched portion, along with hip and gable verge.
- A fall-protection anchor point at each work zone, plus a waterproofing detail that keeps the assembly watertight.
- Ventilation, since a powered attic fan or soffit vent keeps deck moisture from wicking into the insulation.
What Stays Off a Low-Slope Scope
We turn down work that does not belong on a flat assembly, and we would rather say so upfront than sell you the wrong product.
- Three-tab shingle, architectural shingle, and asphalt shingle belong on pitched roofs, not on a low-slope deck.
- Wood shake, cedar shake, slate, clay tile, and concrete tile need a different attachment schedule and warranty.
- Corrugated panel can work over battens on a shed, but it is not a substitute for a single-ply membrane.
- We do not install a snow guard, and an ice dam is rare enough here that ice-and-water shield is mostly unnecessary outside valleys and dormer transitions.
What the Work Costs in Dallas
We quote per square foot, not per square, because commercial square footage and system type drive the number more than anything else. Dallas replacement work runs roughly $6 to $14 per square foot depending on membrane and deck condition.
- TPO or PVC single-ply, mechanically attached, runs about $6 to $10 per square foot installed.
- EPDM fully adhered over new insulation runs about $8 to $13 per square foot.
- Modified bitumen in a two-ply system runs about $7 to $12 per square foot.
- Reflective coating over a sound membrane runs about $2 to $4 per square foot, a fraction of replacement.
- A recover over existing membrane sits lower, near $4 to $8 per square foot, if the insulation tests dry and code allows it.
Warranty and Insurance Claims
A manufacturer NDL warranty runs 15 to 30 years on most systems we install. Coverage depends on the membrane, the insulation, and the attachment method all meeting the same specification.
- System warranties from Carlisle SynTec, GAF EverGuard, Firestone, Johns Manville, and Versico cover membrane defects and labor.
- Hail and wind claims need dated photos, moisture readings, and a line-item estimate before your adjuster visits.
- We meet the adjuster on site and submit a supplemental claim when the approved scope misses deck or flashing work.
- We are licensed and insured, and we will tell you plainly which damage a carrier typically covers and which it does not.
Why Choose Dallas Roof Master for Commercial Roofing in Dallas?
We work Dallas County every week, from Preston Hollow and Lakewood to Uptown, Oak Lawn, Deep Ellum, Casa View, Highland Park, and the Bishop Arts District. Buildings along I-30, I-635, and US-75 get surveyed, bid, and scheduled without a middle layer of salespeople.
Our crews use scaffold and safety harness systems on every multi-story rooftop, and we keep ladder access clear of tenant parking whenever the site allows. As a licensed and insured roofing contractor, we stand behind the scope we write.
Signs You Need Commercial Roofing
Ponding Water After Rain
Water still sitting on the membrane 48 hours after a Dallas spring storm points to a blocked scupper or a deck that has settled. Left alone, ponding accelerates membrane breakdown at the seam.
Membrane Seams Separating
Thermal cycling across a Dallas summer expands and contracts a single-ply until the laps crack open. Once a seam lifts, water wicks sideways under the field and shows up far from the actual breach.
Blistering and Alligatoring
Intense UV exposure oxidizes a modified bitumen cap sheet until it blisters and flakes. That surface damage exposes the bitumen below and speeds end-of-life wear.
Flashing Pull-Away at the Parapet
Counter-flashing that has pulled away from the wall lets water into the wall assembly during high winds. Rust streaks along the coping usually show up before the interior stain does.
Interior Stains at Column Lines
Stains on ceiling tiles that run along column lines usually trace back to an open seam overhead. This pattern is common after hail storms that hit Dallas in spring.
Hail Bruising and Wind Uplift
Hail punctures a metal panel and leaves a low spot that holds water long after the storm passes. Wind uplift at corners and edges shifts ballast and backs out fasteners on the same roof.
What's Included
- ✓ Roof asset survey with square footage, roof pitch, and existing layer documentation for your files.
- ✓ Written condition report covering membrane, flashing, parapet, and drainage deficiencies by severity.
- ✓ Drainage analysis of scuppers, gutters, and downspouts after a heavy rain event.
- ✓ Manufacturer specification matched to TPO, EPDM, modified bitumen, PVC single-ply, or built-up roofing.
- ✓ NDL warranty enrollment with the paperwork submitted under your building name, not ours.
- ✓ Tenant notification coordination so access windows do not interrupt daily operations.
- ✓ Infrared and moisture meter testing before we recommend a recover over a tear-off.
Related Services
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