Material warranty
Covers the product against manufacturing defect for a stated term, often prorated after year ten. Ships you replacement material. Labor, tear-back, crane time and disposal are yours.
NDL vs Material Warranty, at a glance
A material warranty covers defective membrane — the manufacturer replaces the product, and you pay the labor. An NDL (No Dollar Limit) warranty covers labor and material with no cap on the manufacturer’s exposure, but it requires an approved contractor, a specified assembly and a manufacturer inspection at closeout. John Beal Roofing quotes both so you can see the delta. Call (314) 429-6000.
Warranty language is where a lot of St. Louis owners get surprised, and it’s almost never at signing. It’s four years later when a seam opens up, the manufacturer ships two rolls of membrane, and somebody hands you a labor invoice you assumed was covered.
The distinction is worth understanding before you pick a bid, because the cheaper number on the table is often the one with the thinner warranty behind it.
The Two Documents
What Each One Actually Pays
NDL warranty
No Dollar Limit means the manufacturer’s repair obligation isn’t capped at the original material cost. Labor and material both, through the full term, on a system they inspected and approved.
Workmanship warranty
Separate from both, and it’s ours. Manufacturers typically only backstop workmanship for the first couple of years — after that, installation defects fall to the contractor. Ours is a lifetime workmanship warranty on qualifying work.
Full warranty guideWhat NDL requires of the assembly
Thicker membrane, a specific fastening pattern, approved insulation and edge metal, sometimes a cover board. That spec is why an NDL roof costs more — it’s a different roof, not just a different piece of paper.
TPO membrane systemsThe closeout inspection
A manufacturer field rep walks the finished roof before the warranty issues. Punch items get fixed. If a contractor isn’t approved to install the system, no inspection happens and no NDL exists.
Transfer on sale
Most warranties transfer once, inside a set window after closing, for a fee. Miss the window and it dies with the sale. Put it on your closing checklist.
Roof capital planning
Read The Exclusions
What Voids Either One
Ponding water. Almost every manufacturer excludes damage from water standing longer than 48 hours, which in Missouri means a roof with a crushed drain sump can be out of warranty while the certificate is still on the wall.
Wind above the rated speed. Warranties carry a wind cap, often somewhere between 55 and 90 mph depending on the fastening pattern you bought. Straight-line winds through the metro have exceeded that more than once. Above the cap, it’s an insurance claim, not a warranty claim.
Other trades. This is the one that bites property managers. An HVAC contractor cuts in a new curb, a sign company anchors into the deck, a telecom vendor drops a dish on a sleeper — and none of them flash it to spec. That penetration is now an unauthorized alteration and the manufacturer can deny around it.
And missing maintenance. Most NDL warranties require documented annual inspections and drain cleaning. No file, no claim. We keep that file for our maintenance-plan customers so it exists when somebody asks for it.
What The Upgrade Costs
Moving from a standard material warranty to a 20-year NDL usually adds a modest percentage to the total, and most of that isn’t paperwork — it’s the heavier membrane, the tighter fastener pattern and the approved edge metal the manufacturer requires. On a building you plan to hold for fifteen years or more, or on a roof that’s hard to access, it tends to pay for itself the first time a crane is involved. On a building you’re selling in three years, it may not.
How To Compare Two Bids Honestly
Warranty term is not the comparison. Term plus type plus assembly is. A 20-year material warranty on 45-mil membrane is a weaker position than a 15-year NDL on 60-mil with a cover board, even though the bigger number looks better in a board packet. Ask every bidder for the manufacturer, the warranty type, the term, the membrane thickness, the fastening pattern and the wind rating on one line each. Differences show up fast.
Who Actually Services The Claim
Here’s the practical part. When a leak happens, the manufacturer dispatches an approved contractor — often the one who installed it. If that company is gone, and plenty are after fifteen years, you’re waiting on whoever they assign. We’ve been family-run in St. Louis since 1947 and we’re still the ones answering the phone on roofs we installed decades ago. A live dispatcher picks up 24 hours a day, and that matters more at 2 a.m. than the warranty term does.
Related: the full warranty guide, comparing roofing bids and maintenance plans.
Common Questions
Does NDL mean everything is covered forever?
No. It means the manufacturer’s repair obligation isn’t capped at a dollar figure for the covered term. Exclusions still apply — ponding, wind above the rating, alterations by other trades and missed maintenance.
Is the workmanship warranty part of the manufacturer warranty?
Only briefly. Manufacturers usually cover installation defects for the first two years, then it falls to the contractor. Ours is a lifetime workmanship warranty on qualifying work.
Can we get an NDL warranty on a recover?
Sometimes, depending on the system and the condition of what’s underneath. The manufacturer has to approve the assembly, and wet insulation will stop it cold.
Does the warranty transfer if we sell the building?
Usually once, within a set window after closing and for a fee. Start that paperwork before the sale, not after.
What do we have to do to keep it valid?
Documented inspections, clean drains, and no unflashed penetrations by other trades. We handle all three under a maintenance plan and keep the records for you.
Free Roof & Warranty Review
Tell us about the property and a dispatcher will call to schedule. No cost, no obligation.