Commercial & Flat Roofing in New Hampshire
Standing-seam metal sheds snow before it becomes an ice dam and shrugs off coastal salt air that eats through lesser materials. Installed properly, it is the last roof most homeowners ever buy.
What We Do
Low-Slope Roofing Built Around Your Operations
A commercial roof is an operating asset, not just a building component. When it fails you are dealing with tenant complaints, damaged inventory, and a capital expense you did not plan for this quarter.
Vincenzo’s Roofing installs, repairs, restores, and maintains low-slope and flat roofing systems for commercial properties across New Hampshire. We work with owner-operators, property managers, and investors — from a single storefront on the Seacoast to multi-building portfolios inland.
The practical difference on our jobs is scheduling. We section the roof so only part is ever open, stage material to keep entrances and parking clear, and work evenings or weekends where the building allows. Most of our commercial clients stay fully operational throughout.
Systems We Install
Choosing the Right Membrane
Three systems cover almost every commercial roof in New Hampshire. The right one depends on your building’s cooling load, foot traffic, budget horizon, and what is up there already.
Most popular
TPO
White thermoplastic membrane with heat-welded seams
- Reflects sunlight and lowers summer cooling costs
- Heat-welded seams — no adhesive joints to fail
- Strong resistance to punctures and chemical exposure
- Best value for buildings with heavy air conditioning demand
Best value
EPDM
Black synthetic rubber membrane, fully adhered or ballasted
- Handles New Hampshire freeze-thaw cycles exceptionally well
- Lower installed cost than TPO on most buildings
- Simple to repair and patch over its service life
- Dark surface helps shed snow load in winter
Heavy duty
Modified bitumen
Multi-ply asphalt system, torch or cold-adhesive applied
- Multiple layers give redundancy against punctures
- Handles rooftop foot traffic and service access well
- Good choice where equipment is regularly serviced
- Proven performance on older existing substrates
Not sure which applies to your building?
That is what the site survey is for. We measure, check what is already installed, core-sample if the insulation may be wet, and give you a written recommendation with per-square-foot pricing for each viable option — not one number and a signature line.
Who We Work With
Properties We Roof
Retail & storefronts
Strip plazas, standalone stores, and restaurants where closing for a day is not an option.
Office buildings
Single and multi-tenant offices, with work staged outside core business hours.
Multi-unit residential
Apartment buildings and condo associations, including phased work across multiple structures.
Industrial & warehouse
Large-span roofs with rooftop mechanical equipment and heavy drainage requirements.
Medical & professional
Clinics and practices where noise, dust, and access disruption need careful management.
Municipal & institutional
Public buildings and facilities, with documentation suited to procurement requirements.
Assessment
Signs Your Flat Roof Needs Attention
Flat roofs rarely fail suddenly. They give warning for months, usually somewhere nobody is looking.
Water ponding after rain
Standing water more than 48 hours after rainfall accelerates membrane breakdown and adds serious weight to the structure.
Seams lifting or separating
Open seams are the most common entry point on any membrane roof, and the easiest failure to catch early.
Blisters and bubbling
Trapped moisture or air beneath the membrane. Left alone, blisters rupture and open a direct path for water.
Interior ceiling stains
By the time a tenant reports a stain, water has usually been travelling through the insulation for some time.
Failing flashing at penetrations
HVAC curbs, vents, and drains are where most commercial leaks begin — anywhere the membrane has been cut.
Rising energy costs
Wet insulation loses most of its R-value. An unexplained jump in heating or cooling spend often starts at the roof.
Scope of Work
What’s Included in a Commercial Re-Roof
Every commercial project we quote includes the following as standard. Where a competitor’s per-square-foot number comes in lower, this list is usually where the difference sits.
- Full site survey with measurements and photo documentation
- Core sampling to check for wet insulation below the membrane
- Tear-off and disposal of failed existing layers
- Deck inspection and repair where substrate has deteriorated
- New insulation to current R-value requirements
- Tapered insulation to correct drainage and eliminate ponding
- Membrane installed to manufacturer specification for warranty
- New flashing at all curbs, penetrations, and parapet walls
- Drain, scupper, and gutter integration checked and cleared
- Daily site cleanup with access and parking kept clear
- Manufacturer system warranty plus our workmanship warranty
- Close-out documentation for your records and insurers
Straight Pricing
How Much Does Commercial Roofing Cost in New Hampshire?
Commercial roofing is quoted per square foot rather than as a flat job price. EPDM sits at the lower end, TPO in the middle, and fully adhered systems with new insulation and tapered drainage at the upper end. You get a written per-square-foot breakdown after the site survey, with each option priced separately.
- Membrane system — EPDM, TPO, or modified bitumen
- Existing layers — tear-off versus overlay where code permits
- Insulation — new R-value and whether tapered drainage is needed
- Penetrations — HVAC curbs, vents, and skylights all add flashing work
- Roof access — crane or hoist requirements on taller buildings
- Scheduling — after-hours or phased work to keep you operating
How It Works
Your Commercial Project, Step by Step
Site survey
We measure the roof, inspect existing conditions, core-sample for wet insulation, and photograph everything.
Written proposal
Per-square-foot pricing for each viable system, with scope, timeline, and warranty terms in writing.
Schedule & notify
We agree phasing around your hours, pull permits, and give you notice to circulate to tenants and staff.
Phased install
Only part of the roof is open at a time. Access stays clear and the building stays watertight overnight.
Close-out
Final walkthrough, warranty registration, and a documentation pack for your records and insurers.
Ongoing Care
Commercial Roof Maintenance Programs
The cheapest commercial roof is the one that reaches its full service life. Most manufacturer warranties also require documented maintenance to stay valid — a detail that catches out a lot of building owners at claim time.
Twice-yearly inspections
Spring and autumn visits, plus call-outs after major storm events.
Drain & scupper clearing
The single highest-value maintenance task on any flat roof.
Seam & flashing checks
Small separations sealed before they become interior leaks.
Written condition reports
Photographed findings you can file for warranty and budgeting.
Local Expertise
What New Hampshire Does to a Flat Roof
Low-slope roofs face problems here that simply do not exist in milder climates. Specifying for them is the difference between twenty years and twelve.
Snow load and drift
Flat roofs hold snow rather than shedding it, and drifting piles it against parapets and mechanical units. Structural capacity and drainage both have to account for a heavy February, not an average one.
Freeze-thaw on seams
Repeated expansion and contraction works at every seam and flashing joint. Heat-welded TPO seams and properly detailed EPDM terminations hold up far better than adhesive-only assemblies.
Ponding and spring melt
A fast thaw dumps weeks of accumulated snow into the drainage system at once. Undersized or blocked drains turn that into standing water — which is how most flat roof failures actually begin.
Coastal salt exposure
On Seacoast properties, salt corrodes fasteners, edge metal, and rooftop equipment supports years ahead of schedule. We specify corrosion-resistant components on coastal commercial work as standard.
FAQ
Commercial Roofing Questions
Commercial roofing in New Hampshire is generally quoted per square foot, typically between $6 and $14 installed. EPDM sits at the lower end, TPO in the middle, and fully adhered systems with new insulation and tapered drainage at the upper end. Tear-off of existing layers, roof access, and rooftop equipment all affect the final number. We provide a written per-square-foot breakdown after a site survey.
In almost all cases, no. We stage commercial work around your operating hours, section the roof so only part is open at a time, and can work evenings or weekends where the building allows. Tenants and staff are notified in advance, and we keep entrances and parking access clear throughout.
EPDM is a black rubber membrane that is durable, cost-effective, and handles New Hampshire freeze-thaw cycles well. TPO is a white thermoplastic membrane with heat-welded seams that reflects sunlight and lowers summer cooling loads. TPO usually costs slightly more up front. For buildings with significant air conditioning demand, TPO often pays that back.
Often, yes. If the membrane is intact and the insulation underneath is dry, a coating or restoration system can extend service life by ten to fifteen years at a fraction of replacement cost. If moisture has reached the insulation, restoration only traps it. We core-sample before recommending restoration so the decision is based on evidence.
Flat roofs are built with a slight slope toward drains. Ponding usually means blocked drains or scuppers, a compressed or sagging insulation layer, or inadequate original slope. Water standing longer than 48 hours after rain accelerates membrane failure and adds significant weight. Tapered insulation during re-roofing corrects the underlying slope problem.
Yes. We offer scheduled maintenance for property managers and building owners, typically twice a year plus after major storms. Each visit includes drain clearing, seam and flashing inspection, and a written condition report with photographs. Most manufacturer warranties require documented maintenance to stay valid.
Other Roofing Services
Roof Replacement
The full process tear off, timeline, permits, and what to expect.
View replacement →Metal Roofing
The other main option longer life, better snow shedding, higher cost.
Compare metal →Roof Repair
Leaks and lifted shingles traced to the actual source before repair.
View roof repair →Roof Inspection
Free, photo documented condition report before you decide anything.
Book an inspection →Request a Commercial Site Survey
We measure, assess what is already up there, and give you written per-square-foot pricing for each viable system — with a schedule built around keeping your building operating.