Commercial roof repair and replacement across NJ & Philadelphia.
We repair and replace low-slope and steep-slope roofs — including TPO, EPDM, PVC, modified bitumen, built-up roofing, spray foam, metal, coatings, shingles, and slate — for condominiums, commercial, and industrial properties throughout New Jersey, Philadelphia, and its suburbs. Every job is self-performed by our own crews — no subcontractors.
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.
See what's actually inside a commercial roof.
A low-slope TPO roof isn't one sheet — it's an engineered assembly of six layers, each doing a specific job. Toggle the exploded view, rotate, and click any layer to see what it does and why it matters.
A commercial low-slope roof is an engineered assembly — not a single material. Each layer has a specific job: structure, vapor control, insulation, fire rating, waterproofing, and weatherproofing.
- 1Structural Metal Deck1½" flutes · —
- 2Vapor Barrier / Air Retarder40 mils · Negligible
- 3Polyiso Insulation Board2"–4" (tapered) · R-6.5 / inch
- 4High-Density Cover Board½" · Negligible
- 5TPO Membrane60 mils · —
- 6Flashing & Edge Metal24 ga · —
Roofing systems we work on
Every common low-slope and steep-slope commercial roofing system — with photos of the real systems our crews install and repair.
TPO
Low-slope single-plyThermoplastic polyolefin single-ply membranes — energy efficient, heat-welded seams, and eligible for our industry-leading 35-year warranty on new systems.
EPDM
Low-slope single-plyTime-tested thermoset synthetic rubber membrane with over 50 years of proven real-world durability and extreme temperature flexibility.
PVC
Chemical & grease resistant single-plyPremium single-ply thermoplastic membrane with supreme resistance to rooftop animal fats, oils, jet fuels, and industrial chemicals.
Modified Bitumen
Multi-ply low-slopeMulti-ply asphalt system reinforced with polymer modifiers (SBS or APP) providing redundant waterproofing layers and puncture resilience.
Built-Up Roofing
Heavy-duty multi-plyClassic multi-ply hot asphalt and reinforcing plies topped with protective flood coat and gravel ballast for maximum puncture protection.
Spray Polyurethane Foam
Seamless insulated roofingMonolithic, self-flashing closed-cell foam that insulates and waterproofs in a single seamless layer, finished with a protective elastomeric coating.
Metal Roofing
Low-slope & steep-slope architecturalStructural standing-seam and low-slope metal systems engineered for 50+ year lifespans, supreme coastal wind resistance, and modern architectural aesthetics.
Roof Coatings
Restoration & fluid-applied membranesHigh-solids silicone and elastomeric fluid-applied coatings that restore an aging roof, eliminate leaks, and extend service life by 10-20 years without a tear-off.
Architectural Shingles
Steep-slope asphaltDimensional and architectural asphalt shingles for steep-slope commercial, multi-family, and mixed-use buildings — impact-resistant, wind-rated, and backed by manufacturer warranties.
Slate Roofing
Steep-slope natural stonePrecision repair, copper valley restoration, and replacement of natural quarry slate roofing on institutional, historical, and high-end condominium properties.
Two ways we work on your roof.
Whether you need a leak stopped today or a roof at the end of its life replaced, we have a dedicated page for each — with the full process, what to expect, and a quote form.
Roof Repair & Leak Detection
Advanced leak detection finds the true source of the water, and every repair carries a written warranty. For active leaks, storm damage, and preventive maintenance.
See the repair processRoof Replacement
Full roof replacement for occupied buildings — phased scheduling, tenant and board coordination, and coastal wind-uplift design. New TPO systems carry our 35-year warranty.
See the replacement processSigns your commercial roof needs attention
Roof problems are easier and cheaper to fix before water gets inside. If any of these sound familiar, it's worth a look.
Active leak or water stains
Water showing up on interior ceilings or walls — or staining that points to a slow, ongoing leak.
Ponding water
Water that doesn't drain within 48 hours after rain sitting on a low-slope roof, which ages the membrane.
Blisters, bubbles, or cracks
Visible damage in the membrane where moisture has gotten underneath or the surface is failing.
Roof near or past its warranty
An aging roof approaching or past its service life is more likely to leak and is a good candidate for replacement.
Storm or wind damage
After a coastal storm or high wind, a roof should be inspected even if the damage isn't obvious from the ground.
Upcoming sale or inspection
A property sale, insurance review, or inspection that calls for a roof condition assessment.
Capabilities
Roof leak detection & repair
Advanced leak detection tools find the true source of infiltration — so the repair fixes the cause, not just the visible symptom.
Coastal & high-wind roofing
Wind uplift is a key design consideration on coastal properties. We design assemblies and attachment patterns built for coastal exposure.
Warranties that mean something
A 35-year warranty on new TPO systems and a written warranty on every roof repair we perform.
Boards, managers & owners
Experienced working with condominium boards, property managers, and building owners — coordinating access, schedules, and clear communication.
Always self-performed
No subcontractors. Our own W-2 crews install, repair, and warranty every roof — so workmanship stays accountable from estimate to final inspection.
Tell us about your roof — get a free assessment.
Pick the roof system that matches your building, describe the issue, and we'll reach out within one business day to schedule a look.
Which roof system can we help with?
Tell us the system and what's going on. We'll follow up within one business day.