A new roof is one of the biggest investments you’ll make in your home, and the warranty behind it matters almost as much as the shingles themselves. In Maryland, roofs take a beating from humid summers, nor’easters, freeze-thaw cycles, and the occasional tropical storm moving up the Chesapeake. When something goes wrong, your warranty decides who pays to fix it.
The catch: most roof warranties are really two separate promises from two different companies. Knowing the difference before you sign is the best way to protect your home and your budget.
Two kinds of coverage, two different promises
A manufacturer warranty comes from the company that made your shingles and other roofing materials. It covers defects in those products, such as shingles that crack, curl, or lose granules prematurely because of how they were made.
A workmanship warranty comes from your roofing contractor. It covers mistakes in how the roof was installed, such as improperly nailed shingles, poorly sealed flashing, or inadequate ventilation.
Here’s why that distinction matters: industry studies and manufacturers themselves report that most roof failures trace back to installation problems, not defective materials. A long manufacturer warranty on its own may not cover the issues you’re most likely to face.
Manufacturer warranties: what “lifetime” really means
Nearly every major shingle brand advertises a “limited lifetime” warranty. That label sounds reassuring, but the details matter.
Standard warranties come automatically with the product. They typically cover only the materials, and only at full value for an initial period (often around 10 years). After that, coverage becomes prorated: the manufacturer pays a shrinking share of the material cost as the roof ages, and labor to tear off and replace shingles is usually excluded.
Enhanced or system warranties are available only when a manufacturer-certified contractor installs a full roofing system from that brand (shingles, underlayment, starter strips, ridge caps, and ventilation). These can extend the non-prorated period to 25–50 years, add labor and tear-off costs, and in some top tiers even cover installer workmanship. GAF, Owens Corning, and CertainTeed all offer tiers like this through their certified contractor programs.
What manufacturer warranties generally do not cover:
- Installation errors by your roofer (unless you have a top-tier system warranty)
- Storm damage from wind above the shingle’s rated speed, hail, or fallen trees (that’s homeowners insurance)
- Damage from foot traffic, satellite dish mounting, or other alterations
- Problems caused by poor attic ventilation
- Algae or discoloration beyond any specific algae-resistance coverage period
Workmanship warranties: your contractor’s promise
A workmanship warranty is only as strong as the roofer who stands behind it. It covers the labor and materials needed to fix leaks or failures caused by installation errors, such as:
- Shingles nailed too high, too low, or with too few fasteners, leading to blow-offs
- Flashing around chimneys, skylights, and walls that wasn’t sealed or lapped correctly
- Missing or misplaced ice-and-water shield in valleys and along eaves
- Inadequate intake or exhaust ventilation that shortens shingle life
Terms vary widely, from 1 or 2 years with some contractors to 10 years, 25 years, or a “lifetime” with others. Length matters, but so does the company’s track record. A 25-year promise from a roofer who opened last spring is worth less than a 10-year promise from one that has served your neighborhood for decades. Always get the workmanship warranty in writing, as part of your contract.
What’s different in Maryland
Hire an MHIC-licensed roofer. Maryland requires home improvement contractors, including roofers, to be licensed by the Maryland Home Improvement Commission (MHIC). A licensed contractor’s MHIC number should appear on the contract, and you can verify it on the Maryland Department of Labor’s website before you sign.
The Guaranty Fund is a safety net, not a warranty. MHIC runs a Home Improvement Guaranty Fund that can reimburse homeowners for actual losses from unworkmanlike, incomplete, or abandoned work by a licensed contractor. The maximum recovery is $30,000 per claimant, or what you paid the contractor if that’s less, and $250,000 across all claimants against one contractor (MHIC Guaranty Fund FAQ). Work by unlicensed contractors isn’t eligible, and the claims process can take months, so a strong written workmanship warranty from a stable company is still your first line of defense.
Maryland weather tests installation quality. Ice dams in Western Maryland, high winds on the Eastern Shore, and heavy summer storms across the Baltimore–Washington corridor all expose installation shortcuts. Ask your roofer about ice-and-water shield coverage and the wind rating of the shingles and nailing pattern they plan to use.
Transferability matters when you sell. Many Maryland homeowners move before a roof reaches the end of its life. Some manufacturer warranties can be transferred once to a new owner, sometimes with a fee or a shortened coverage period, and a transferable warranty can be a selling point. Check the transfer rules for both warranties and keep your paperwork with your home records.
Common ways homeowners void a warranty
Even the best warranty can disappear if its conditions aren’t met. Watch out for these:
- Not registering the warranty. Many enhanced manufacturer warranties must be registered within a set window after installation.
- Layering over an old roof. Installing new shingles over existing ones can reduce or void manufacturer coverage.
- Mixing brands. System warranties usually require the same manufacturer’s components throughout.
- Unauthorized repairs or modifications. Having another company patch the roof, or mounting solar panels, satellite dishes, or antennas without following the warranty’s rules, can cancel coverage.
- Skipping maintenance. Clogged gutters, debris buildup, and overhanging branches can lead to denied claims.
- Poor ventilation. An under-ventilated attic is a top reason manufacturers deny shingle claims.
Questions to ask before you sign
- What is your MHIC license number?
- Are you certified by the shingle manufacturer, and which warranty tiers can you offer?
- Which manufacturer warranty will my roof have, and how long is the non-prorated period?
- Does the manufacturer warranty include labor and tear-off, or only materials?
- How long is your workmanship warranty, and can I see it in writing?
- Who registers the manufacturer warranty, and when will I receive confirmation?
- Are both warranties transferable if I sell my home?
- What maintenance do I need to do to keep my coverage valid?
- If I have a problem, who do I call first, and how quickly do you respond?
A trustworthy roofer will answer every one of these clearly and put the answers in writing.
Get a roof that’s backed on both fronts
The best coverage combines a manufacturer warranty for your materials with a written workmanship warranty from an experienced Maryland roofer. Together, they protect you whether a problem starts with the product or the installation.
Ready for a new roof? Excel Roofing stands behind every installation with clear, written warranty coverage. Schedule your free roof inspection and estimate today, and we’ll explain exactly what your warranty includes before you sign. Call 443-819-3017 or request your free estimate online.