Professional roofing services by Merrimack Valley Roofing in Sandown, NH, featuring a commercial flat roof with EPDM and metal roofing systems.
Established 1976 · Family-Run

Commercial Roofing Contractors in NH and MA

Flat and low-slope roof replacement, repair, and winter service for commercial buildings across Southern New Hampshire, Northeast Massachusetts, and Maine. TPO, EPDM, and metal systems, installed by the same crews builders and property managers around here have been calling since 1976.

Carlisle Certified Installer GAF Master Elite BBB A+ Accredited Fully Licensed & Insured
Carlisle Certified
EPDM & Flat Roof
Family-Run
Since 1976
Manufacturer-Backed
Lifetime Guarantee
24-Hour
Emergency Service
Carlisle Certified GAF Master Elite BBB A+ Accredited Licensed & Insured 14-Year Warranty Family-Run Since 1976

Quick Answer

Merrimack Valley Roofing is a family-run commercial roofing contractor based in Sandown, NH, serving Southern New Hampshire, Northeast Massachusetts, and Maine since 1976. MVR is a Carlisle certified installer for commercial EPDM and flat roof systems, a GAF Master Elite installer, and BBB A+ Accredited. Commercial work includes flat and low-slope roof replacement, TPO and EPDM single-ply membrane installation, commercial metal roofing, roof repair and leak diagnosis, commercial gutter systems, and roof snow and ice dam removal. Buildings served include offices, retail, condominium and multi-family properties, warehouses, and industrial sites. Every installation carries a manufacturer-backed lifetime guarantee plus a 14-year materials and service warranty. Fully licensed and insured. 24/7 emergency service.

50Years of New England Roofs
3 States Served
24/7 Emergency Response
01 / Who We Work For

Why Do Builders and Property Managers Keep Calling Us Back?

Most of our commercial work comes from people who have already used us. General contractors, developers, and property managers across the Merrimack Valley and the Seacoast put us on the same buildings year after year. That is a harder audience than a homeowner. They know what a bad flashing detail costs eighteen months later.

The crew that shows up is the crew we send every time. Same foremen, same standards, same phone number since 1976. If your tenant calls you at 6 a.m. about water on the sales floor, you get a person, not a ticket number.

02 / Systems We Install

Which Commercial Roofing System Is Right for Your Building?

Most commercial buildings in this region end up on one of three systems. The right one depends on the deck, the slope, how the roof drains, what is already up there, and how long you plan to hold the building. Here is the plain-English version of each.

01 / Single-Ply

TPO Membrane Roofing

A white thermoplastic single-ply membrane with heat-welded seams. The reflective surface bounces summer sun back off the building instead of holding it, which usually shows up on the cooling bill.

  • Flat and low-slope roofs
  • Heat-welded seams, no adhesive at the laps
  • Common on retail, office, and warehouse decks
  • Reflective white surface
02 / Single-Ply

EPDM Rubber Roofing

Black synthetic rubber membrane, the workhorse of New England flat roofs. It handles the freeze and thaw cycle we get from December through March, and a repair on it is straightforward decades in.

  • Carlisle certified installation
  • Holds up through freeze and thaw
  • Simple to patch and repair later
  • Fully adhered or mechanically fastened
03 / Metal

Commercial Metal Roofing

For pitched commercial buildings, storage structures, and additions where the roof is visible from the street. Long service life, sheds snow well, and pairs with the metal trim and gutter work we already do in-house.

  • Pitched and steep-slope commercial roofs
  • Sheds snow load
  • Coordinated metal trim and flashing
  • Gutters handled by the same crew
03 / Working Around You

Can You Re-Roof a Building That Stays Open?

Yes, and most of ours are. Tenants keep trading, the office keeps working, the loading dock keeps running. That is the normal condition on a commercial job, so we plan the sequence around it before anything comes off the roof.

  • Sectioned tear-offWe open what we can dry in the same day. No open deck sitting overnight waiting on weather.
  • Entrances and parking stay usableStaging, dumpster, and lift placement get worked out with you first, not decided in the parking lot on day one.
  • Site cleaned dailyDebris and fasteners get picked up at the end of each day, not at the end of the job. Ask the developers we work for about that one.
  • One crew for the whole envelopeRoof, gutters, and siding in the same mobilization when the building needs all three.
Talk Through Your Building
Merrimack Valley Roofing | Commercial Roofing
Commercial Re-Roof Occupied building · Merrimack Valley
04 / How We Quote

How Does Merrimack Valley Roofing Quote a Commercial Roof?

No two commercial roofs price the same way. Square footage is only the starting point. Deck condition, how many layers are already up there, insulation, drains and scuppers, curbs, penetrations, parapet detail, and how we get material onto the roof all move the number.

STEP 01

You Call

Tell us the building, the address, and what is going on up there. Leak, end of service life, or a property you are about to buy.

STEP 02

We Get on the Roof

A foreman walks it in person. Cores or test cuts where the deck is a question mark. Photos of what we find.

STEP 03

Written Scope

An itemized written estimate covering system, insulation, flashings, drainage, and warranty. You get it before anything is ordered.

STEP 04

Scheduled Around You

We set the dates against your operating hours and tenant schedule, then hold them.

We do not publish commercial prices online. The only number worth anything is the one written down after a foreman has walked your roof and looked under it. That walk is free, and so is the written estimate.

Merrimack Valley Roofing | Commercial Roofing
Fifty Winters Snow load & ice dam response · NH · MA · ME
05 / Winter Service

Do You Handle Commercial Roof Snow and Ice Dam Removal?

We do, across all three states. Flat commercial roofs are the ones that get people in February. Snow piles up, the drains freeze, and a foot of wet snow gets a lot heavier than the number your engineer put on paper.

We clear commercial roof snow and take ice dams off with steam rather than chisels and hammers, so the membrane underneath survives the process. If you manage a property with a flat roof, get on a list before the first storm instead of calling during it. See the full ice and snow removal service.

Call (978) 662-7079
06 / What Builders Say

Commercial Roofing Reviews from Developers and Builders

Homeowners rate a roofer once. Builders and developers rate us on the twentieth job. These are from people whose own reputation was riding on the work.

Developer / 20+ Projects

Used them over 20 times.

"Merrimack Valley roofing has help me out on many occasions. I have worked with Barry and with Daniel both lead great teams and offer professional commercial and residential work. Our job sites were left clean and they were overly efficient and I have never had a problem with any of their work. As a developer on the Seacoast I completely trust this company, have used over 20 times and will hopefully work with them many more."

DL
Daniel Loh Verified Review / Developer
Builder / Repeat Customer

Always shows up on time.

"I've used Merrimack roofing on several high end roof finishes. Always shows up on time. Below market pricing. And comes back when need. And as a builder who has several crews and several projects. I know what I'm talking about. They even clean up after themselves. Would highly recommend."

HG
Harry George Verified Review / Builder
Emergency Repair

Called yesterday. Fixed today.

"We have used Merrimack Valley Roofing a number of times now (most recently to repair wind damage), and they have been rock solid every time. They are responsive, do quality work quickly, and at a fair price. For this repair I called them yesterday, and my roof is fixed literally less than 24 hours later. Thank you MVR!"

MG
Mark Gibbas Verified Review

Manufacturer-Backed Lifetime Guarantee on Every Commercial Installation

Plus our 14-year materials and service warranty. Same crews, same standards, and the same number to call if the building needs us back.

Book the Estimate
07 / Where We Work

Commercial Roofing Service Areas Across NH, MA, and Maine

We run commercial work out of Sandown, NH, and cover the Merrimack Valley, the Seacoast, and Southern Maine. If your building is not in a town listed here, call anyway. Odds are we have worked on a roof down the road.

Southern NH

  • Salem
  • Derry
  • Windham
  • Sandown
  • Kingston
  • Plaistow
  • Manchester
  • Portsmouth
New Hampshire Roofing

Northeast MA

  • Methuen
  • Andover
  • N. Andover
  • Lawrence
  • Haverhill
  • Newburyport
  • Amesbury
  • Lowell
Massachusetts Roofing

Southern ME

  • Kittery
  • York
  • S. Berwick
  • N. Berwick
  • Eliot
  • Wells
Maine Roofing
08 / Common Questions

Commercial Roofing FAQs

Straight answers in plain English. If your question is not here, call (978) 662-7079 and you will get an answer on the phone.

What is the difference between TPO and EPDM commercial roofing?

TPO, short for thermoplastic polyolefin, is a white single-ply membrane with heat-welded seams. The white surface reflects sunlight instead of absorbing it, so buildings with big cooling loads often run cheaper in summer on TPO.

EPDM, short for ethylene propylene diene monomer, is a black synthetic rubber membrane. It takes the New England freeze and thaw cycle well and stays easy to patch decades after installation. We are a Carlisle certified installer for EPDM and flat roof systems.

Which one fits comes down to your deck, your drainage, your energy costs, and how long you plan to own the building. A foreman will walk both options with you on the estimate.

Do you handle commercial roof snow and ice dam removal in NH and MA?

Yes. We clear snow off commercial roofs and remove ice dams across Southern New Hampshire, Northeast Massachusetts, and Maine. Heavy wet snow on a flat roof puts real load on the structure, and blocked drains send that water inside instead of off the building.

We use steam on ice dams rather than chipping at them, so the membrane underneath does not get damaged in the process. Property managers with flat roofs are better off arranging coverage before the first storm than calling during one. Full details on the ice and snow removal page.

How long does a commercial roof replacement take?

It depends on the square footage, how many layers have to come off, the condition of the deck underneath, the system going on, and how much curb and penetration detail is up there. A single-tenant retail box and a multi-building condominium property are not the same job.

Once a foreman has walked the roof, you get a schedule with real dates in the written estimate, sequenced around your operating hours. We would rather give you an accurate schedule after seeing the roof than a guess before.

Can my business stay open during a commercial roof replacement?

In most cases yes. We tear off in sections and dry in what we open the same day, so there is no exposed deck waiting overnight on the weather. Staging, dumpster placement, and lift access get planned with you before the first day so entrances and parking stay usable.

Debris and fasteners get picked up daily. On occupied buildings that matters more than almost anything else we do.

Does my flat roof need replacement or can it be repaired?

A membrane with isolated punctures, failed seams in one area, or bad flashing at a single curb is usually a repair. Widespread blistering, saturated insulation, ponding that never drains, or a deck that has gone soft points toward replacement.

The way to know is a physical inspection with test cuts where the deck is questionable. We climb up, look under it, and tell you what we find with photos. If a repair buys you several more good years, we will say so.

What kinds of commercial buildings do you roof?

Offices, retail, condominium and multi-family properties, warehouses, and industrial buildings. A lot of our work comes through general contractors, developers, and property managers who put us on multiple properties.

We also handle the rest of the building envelope, including commercial gutter systems and siding, so one crew can cover it in a single mobilization. Single-family work runs through our residential roofing side.

What warranty comes with a commercial roof?

Every roof we install carries a manufacturer-backed lifetime guarantee, plus our own 14-year materials and service warranty on top of it. We hold manufacturer certifications including Carlisle for commercial EPDM and flat roof systems and GAF Master Elite, which is what makes those manufacturer-backed guarantees available in the first place.

If something needs attention later, you call the same number you called the first time.

Do you offer emergency commercial roof repair?

Yes, 24/7. Active leaks, storm damage, and wind-lifted membrane get same-day attention in most cases. Call (978) 662-7079 and you will reach a person rather than an answering service queue.

For a leak that is already inside the building, get us on the phone before you call anyone else. Every hour that water runs costs more than the roof repair will.

09 / Let's Talk

Get a Free Commercial Roof Estimate

Pick up the phone or send the form. You will hear back from a real person, usually the same business day. Free written estimates on commercial roof replacement, repair, and winter service across Southern NH, Northeast Mass, and Maine.

Call us, 24/7 for emergencies (978) 662-7079

Mon-Sat 7am-7pm regular hours. 24/7 for active leaks and snow load.

Or send us the building details Fill out the form →

Address, roof type, and what is going on. We'll call back the same business day.