Commercial roof replacement & new construction roofing across NJ & Philadelphia.
Whether a roof has reached the end of its service life or you're breaking ground on a new building, Datum Roofing installs it — TPO, EPDM, PVC, modified bitumen, built-up, spray foam, metal, or slate. We replace roofs on occupied buildings with a clear process that keeps them open and protected, and we install new roofs on ground-up construction. New TPO systems carry our 35-year 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.
How we replace a roof on an occupied building.
Replacing a roof on a building that stays open takes planning. Here's the process our crews follow on occupied condominium, commercial, and industrial replacement projects across New Jersey and the Philadelphia area. For new construction, see the ground-up process further down the page.
1. Roof condition assessment
We inspect the existing roof, document its condition, and identify the system in place. You get a clear report on remaining service life and whether replacement is the right call versus a repair or restoration.
2. System selection & design
We recommend the right replacement system for your building and exposure — TPO, EPDM, PVC, modified bitumen, built-up, spray foam, metal, or slate — with wind-uplift design for coastal properties.
3. Occupancy & access planning
For occupied buildings we plan around your tenants, residents, and operations. We coordinate access points, staging areas, work hours, and phasing so the building stays open and usable throughout the project.
4. Tenant & board communication
We communicate with condominium boards, property managers, and building occupants in advance — what to expect, where crews will be, and how we'll minimize noise, odors, and disruption.
5. Phased replacement schedule
On large or occupied roofs we phase the work in sections so only part of the roof is open at a time. Each section is fully dried-in and weather-tight before we move on, protecting the building at every stage.
6. Tear-off & installation
Our crews remove the failed roof down to the deck, repair the substrate as needed, and install the new system to manufacturer specifications — including proper flashing, insulation, and attachment.
7. Final inspection & warranty
We inspect the finished roof, walk it with you, and register the manufacturer warranty. New TPO systems carry our 35-year warranty, and every replacement is documented and backed by Lasher's 30+ years of experience.
Replacement that keeps your building running.
Most of the roofs we replace are on buildings that stay occupied — condominiums with residents in place, offices and retail with daily operations, and industrial facilities that can't shut down. We plan the project around the people inside.
Phased work sections
We break the roof into sections so the building is never fully exposed. Each section is sealed and weather-tight before crews move to the next.
After-hours & off-peak scheduling
Where noise, odors, or access are a concern — especially in occupied condos and offices — we schedule disruptive work for evenings, weekends, or low-occupancy periods.
Controlled access & staging
Crews use designated access points and staging areas that keep occupants away from the work zone and keep materials and debris off the ground below.
Daily clean-up & site safety
We clean the site daily, secure the perimeter, and maintain safe walkways so residents, tenants, and visitors aren't exposed to the work.
Advance notice to occupants
Boards, managers, and tenants get clear notice before work starts — what we're doing, when, and what to expect — so there are no surprises.
Single point of contact
One project lead coordinates the schedule, the crew, and communication with your board or management company from start to finish.
Coastal wind-uplift design
On coastal and waterfront properties, wind uplift is a key design consideration. We engineer the replacement assembly and attachment pattern to hold up to coastal exposure — so the new roof doesn't just stop water, it stays on in high wind.
Ground-up commercial roofing for new builds.
Datum Roofing also installs roofs on new construction — condominium developments, commercial buildings, industrial facilities, and mixed-use projects under construction across New Jersey and the Philadelphia area. We coordinate with your general contractor, architect, and structural engineer to install the specified roof system on schedule and to manufacturer standards.
Coordination with the build team
We work with your general contractor, architect, and structural engineer to install the specified roof system on the project schedule and to manufacturer specifications.
Deck prep & substrate
We prep the new deck — structural concrete, metal deck, or wood — and install the insulation and cover board substrate the roof system requires.
System installation
We install the specified roof system — TPO, EPDM, PVC, modified bitumen, built-up, spray foam, metal, or slate — with proper flashing, attachment, and edge details.
Coastal wind-uplift design
On coastal and waterfront new builds, we engineer the attachment pattern and perimeter edge metal to the wind-uplift loads the building will see.
Final inspection & warranty
We inspect the finished roof, walk it with the project team, and register the manufacturer warranty. New TPO systems carry our 35-year warranty.
Hand-off documentation
You receive full documentation of the installed system, warranty registration, and a maintenance plan so the roof performs for its full service life.
Built to spec, on schedule
We install the roof system your project calls for — whether that's a 60-mil mechanically fastened TPO assembly on a new warehouse, a PVC system on a restaurant build-out, or standing-seam metal on a new condominium clubhouse. Every new installation is documented and registered for full manufacturer warranty, with new TPO systems carrying our 35-year warranty.
When replacement is the right call.
Not every aging roof needs to come off. But if you're seeing several of these, it's time to talk about replacement:
- Your roof is at or past its expected service life
- Repeated repairs in the same areas that don't hold
- Widespread membrane aging, blistering, or cracking
- Saturated insulation or a soft, spongy deck
- You're planning a capital project or building sale
- Energy costs climbing from a failing roof surface
Every common commercial roofing system.
We replace low-slope and steep-slope roofs on condominium, commercial, and industrial properties — and we'll recommend the right system for your building and budget.
Get a free roof replacement assessment.
Tell us about your building and the roof. We'll inspect it, recommend the right replacement system, and walk you through a plan that keeps your building occupied and protected — then follow up within one business day.
Request a roof replacement quote.
Tell us about the building and the roof. We'll follow up within one business day to schedule an assessment.