Commercial roofing expertise, backed by 30+ years of Lasher structural restoration.
Based in Linwood, NJ, Datum Roofing serves condominiums, commercial, and industrial properties throughout New Jersey, Philadelphia, and the Mid-Atlantic.
Stopping water infiltration before it becomes structural damage.
Datum Roofing was founded by Lasher — a leading regional structural restoration and engineering firm. After decades of fixing corroded steel decks, rotted concrete slabs, and water-damaged masonry, Lasher saw a consistent pattern: almost every major structural repair started years earlier as an unaddressed roof leak.
Datum was established to solve that problem at the top of the building. We operate as a dedicated commercial roofing contractor, giving property owners, condo boards, and facility managers a trusted partner who understands how water moves through a building envelope.
We handle every major low-slope and steep-slope system — TPO, EPDM, PVC, modified bitumen, built-up, spray foam, standing-seam metal, silicone coatings, and natural slate. On coastal and shore properties, our designs specifically address coastal wind uplift and salt-fog atmospheric exposure.
Linwood, NJ Headquarters
Serving Atlantic, Cape May, Ocean, Camden, Burlington, Gloucester, Philadelphia, Delaware County, Montgomery County, Washington DC, Alexandria, Chicago, NY, and beyond.
The Datum Standard
- Find the true cause of a leak using non-destructive moisture scans & core samples
- Repair and replace low-slope single-ply, multi-ply, metal, and steep-slope slate roofs
- Written warranty on every repair — industry-leading 35 years on new TPO systems
- Deep experience working with condominium boards, property managers, and building owners
Four pillars that set Datum apart.
Always Self-Performed
We don't subcontract. Our own W-2 crews install and repair every roof we touch, from single-ply membranes to standing-seam metal and natural slate. The hands on your roof are the same hands accountable for the result — no middlemen, no finger-pointing.
Lasher Engineering Backbone
As a Lasher company, Datum draws on 30+ years of structural restoration expertise. When a job involves complex parapets, expansion joints, or structural decks, engineering support is built right in — not bolted on after the fact.
Disciplined Estimating
We perform exhaustive core cuts and moisture scans before writing proposals. The result: only 6% of our roof replacements involve a change order, and 96.7% finish on time. Thorough upfront means fewer surprises and budgets that hold.
Seamless Execution
A roof hides moves you don't see coming — a soft deck, a buried drain, rot behind clean masonry. Our structural background means we've already seen every trick a roof can pull, and we walk onto every job with a plan for all of them.
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.
3D Roof Assembly Explainer
See the six engineered layers inside a commercial low-slope roof. Explode it, rotate it, and click any layer for details.
OpenRoof ROI & Reserve Study Calculator
Model remaining useful life, replacement costs, and the reserve contribution needed to avoid a special assessment.
OpenThe manufacturers behind every roof we install.
Datum installs the leading commercial roofing brands in North America. That means genuine manufacturer warranties, approved system assemblies, and materials engineered to hold up to coastal wind uplift and Mid-Atlantic weather — installed by our own crews, not subcontractors.
Manufacturer certifications and warranty offerings vary by system and region. Ask our team about current certifications for your specific roof type and property.
The Lasher connection: engineering precision on every rooftop.
Lasher’s 30+ years in structural restoration provides Datum with an unmatched technical foundation. While traditional roofers see only membrane and flashing, Datum’s evaluations take into account deck integrity, expansion joint movement, parapet masonry, and building structural loads.
When a project genuinely calls for engineered design support or structural load verification, Lasher’s engineering team steps in directly. For ordinary repairs and replacements, you get the speed, focus, and competitive pricing of a specialized commercial roofing contractor.
Talk to a commercial roofing expert.
Tell us about your property and what's going on with the roof. We'll get back within one business day to schedule a thorough, no-cost assessment.
- (609) 910-0668
- dl@lashercorp.com
- Linwood, NJ
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