Commercial roof repair & leak detection across NJ & Philadelphia.
A leak rarely starts where it shows up inside. Datum Roofing uses advanced leak detection tools to find the true source of the water — then repairs the cause, not just the spot. Every repair carries a written warranty.
Our estimating process for Commercial Projects: thorough by design, zero surprises.
With deep roots in engineering and structural restoration, Datum takes existing conditions seriously. In commercial roofing, change orders are often treated as business as usual — but to us, too many change orders are a black mark. Our estimating is always 100% free, but engineered to be exhaustive before work begins.
Only 6% of our roof replacements involve a change order.
That low rate is the direct result of core samples, deck verification, and moisture scans completed before we price the work.
Projects finish on time — and yes, we're proud of that .7%!
Detailed phasing, tenant coordination, and weather buffers keep condominium boards and owners on schedule.
Exhaustive existing condition analysis at no charge.
Full condition audit, core cuts, moisture maps, and written replacement vs. repair options for your board or management company.
1. Core sampling & deck verification
We take physical core cuts through the membrane to verify the exact assembly underneath — number of existing plies, insulation type and thickness, substrate condition, and deck type (concrete, metal, wood, gypsum). No guessing.
2. Thermal moisture scanning
Non-destructive electronic moisture meters and infrared thermal imaging map trapped moisture pockets across the roof deck so wet insulation is quantified before the proposal is written — not discovered during tear-off.
3. Ventilation & intake/exhaust analysis
We calculate intake, exhaust, and rooftop airflow dynamics to prevent condensation, pressure imbalance, and premature membrane failure. A low-slope roof without proper ventilation engineering traps moisture from below.
4. Structural condition & load review
Drawing on Lasher's 30+ years in structural restoration and engineering, we evaluate parapets, expansion joints, deck deflection, and drainage slopes so every structural constraint is solved in the upfront scope.
The latest technology to find the real source of a roof leak.
A leak rarely starts where water shows up inside. Water travels along deck flutes, insulation joints, and structural members — so the stain on your ceiling can be 40 feet from where the membrane actually failed. Datum uses infrared thermal imaging, electronic vector scanning, dye trace testing, and physical core cuts to pinpoint the true source, so the repair fixes the cause and you can run your business without dealing with a leaking roof.
Infrared Thermal Imaging
Thermal cameras reveal moisture trapped under the membrane before it's visible — wet insulation shows as a distinct thermal signature the surface alone can't expose.
Catches wet insulation and deck that a visual walk would miss.
Electronic Vector (Moisture) Scanning
A low-voltage electric field traced across the dry membrane surface flags every conductive breach — pinholes, seam splits, and punctures that let water through but nothing else.
Locates the exact membrane breach, even when the interior stain is 30 feet away.
Dye Trace / Flood Testing
On flat roofs and persistent mystery leaks, a controlled flood test with tracer dye isolates the failing seam or penetration by following the colored water path end-to-end.
Confirms the leak source with certainty — not a best guess.
Core Cuts & Deck Inspection
A small physical core sample through the assembly verifies the real layers, insulation saturation, and deck condition — so the repair targets what's actually failing, not what it looks like from on top.
Tells us exactly what's underneath and whether it's salvageable.
Stop guessing. Find the leak and fix the cause — warranted.
Most roofers patch the visible stain and leave. When the water comes back, you're paying for the same repair twice. Our detection process identifies the real entry point the first time — and every repair we make carries a written warranty.
3D Roof Assembly Explainer
See what's actually inside a commercial roof — structural deck, vapor barrier, polyiso insulation, cover boards, membrane, and edge metal. Explode it, rotate it, and click any layer.
Open the explainerRoof ROI & Reserve Study Calculator
Model remaining useful life, project replacement costs, compare a silicone restoration against a full tear-off, and calculate the reserve contribution needed to avoid a special assessment.
Open the calculatorFind the source. Fix the cause. Warranty the work.
Most roofers patch the spot where water appears. Datum finds where the water is actually getting in — because a repair that doesn't fix the cause will leak again. Here's how we approach every commercial roof repair.
1. Leak detection
We use advanced leak detection tools — infrared thermal imaging, electronic vector moisture scanning, dye trace testing, and core cuts — to find where the water is actually getting in, which is rarely where it shows up inside.
2. Inspection & diagnosis
We inspect the roof system, document the cause, and tell you exactly what's failing and why — so the repair addresses the source, not just the visible symptom.
3. Targeted repair
Our crews repair the failed area using materials compatible with your roof system — membrane patches, seam re-welds, flashing repairs, sealant replacement, or drain and penetration fixes.
4. Warranty & documentation
Every roof repair we perform carries a written warranty. You get documentation of what was done and what's covered, so you have it on file for your board, insurer, or management company.
Every common commercial roof repair.
From an active leak to scheduled maintenance, our crews repair low-slope and steep-slope roofs on condominiums, commercial buildings, and industrial facilities across New Jersey and the Philadelphia area.
Active leak repair
Priority response for active water infiltration. We find the source fast and stop the leak before it causes interior or structural damage.
Membrane & seam repair
Patches, re-welded seams, and membrane repairs for TPO, EPDM, PVC, modified bitumen, and built-up systems where the surface has failed locally.
Flashing & penetration repair
Failed flashing around penetrations, curbs, parapets, and edges is one of the most common leak sources. We repair and reseal them properly.
Drain & ponding water repair
Clogged or undersized drains and ponding water age a roof fast. We clear, resize, and re-slope to get water off the roof.
Storm & wind damage repair
After a coastal storm or high wind, we inspect and repair lifted membrane, torn flashing, and impact damage — and document it for insurance.
Preventive maintenance
Scheduled inspections and small repairs that catch problems early and extend the life of a roof that still has service life left.
Signs your commercial roof needs repair.
Roof problems are easier and cheaper to fix before water gets inside. If any of these sound familiar, it's worth a call.
- Water stains on interior ceilings or walls
- Active drip or water entering the building
- Ponding water that doesn't drain within 48 hours
- Blisters, bubbles, or cracks in the membrane
- Loose or lifted flashing around penetrations and edges
- Roof approaching or past its warranty term
- After a storm or high-wind event
- Before a property sale, insurance review, or inspection
Active leak or scheduled repair — start here.
Tell us what's going on with the roof. For active leaks, call us directly at (609) 910-0668 for priority dispatch. Otherwise, fill this out and we'll follow up within one business day to schedule an assessment.
Request a roof repair.
Describe the issue — active leak, visible damage, or scheduled maintenance. We'll follow up within one business day.