Roofing Warranties Explained: Manufacturer vs. Workmanship, What “Lifetime” and “Prorated” Mean, and What Voids Them

The manufacturer’s warranty

Covers manufacturing defects in the shingle (or panel, or membrane): cracking, granule loss, delamination that the manufacturer agrees was the product’s fault. A typical architectural shingle “limited lifetime” warranty works like this: for the first 10 years (sometimes 5, sometimes 15), a defect is covered at full replacement value of the material and sometimes labour; after that it is prorated, paying a shrinking percentage of the material cost only, so a defect at year 22 of a 30-year warranty might pay 25% of the shingles and nothing toward the roofer, the tear-off or the disposal. “Lifetime” means the original owner’s ownership of the house, with a transfer to one later owner allowed within a window if registered. What it excludes, on every one of them: improper installation, inadequate ventilation, ice dams, wind above the rated speed, hail unless Class 4, foot traffic, overlays on some lines, and anything the roofer did or did not do. In practice, a manufacturer’s claim is a slab of defective shingles from a bad batch, documented with photos and samples, and it is rare.

The enhanced (system) warranty

GAF Golden Pledge, IKO Pro4 and the like: the manufacturer covers material and labour, including tear-off, for 25 to 50 years, non-prorated for a long first period, and sometimes covers workmanship too if the roofer goes out of business. The conditions: a roofer certified by that manufacturer installs it; the whole system is that brand (underlayment, starter, ridge cap, vents, ice and water); the roofer registers it in your name within a set time; and the roofer pays the manufacturer a fee for it, which shows up as $300 to $800 on your quote. Worth it on a long-stay house with a certified roofer; a sales line if the roofer is not certified, because then it does not exist no matter what the quote says. Ask for the certification and the registration confirmation.

The workmanship warranty

From the roofer, on the installation: flashings, nailing, valleys, the things that actually leak. Two years is minimal, five is normal, ten is good, “lifetime” is a company’s lifetime and is a reason to ask how long the company has existed. What it should say: the term in years from completion; that it covers leaks and defects arising from the installation; what it excludes (storm damage, your foot traffic, other trades’ work); that you report in writing and they respond within a set time; and that it is from the company named on the contract. What it is worth: the company. A ten-year warranty from a roofer who has been in business fifteen years and is in the phone book is worth something; from one who incorporated last spring, it is paper. Which is why the hiring page asks for a reference from five years ago.

What voids them

• Ventilation. Every manufacturer requires attic ventilation to their spec (usually the 1 in 300 rule). An under-vented attic voids the material warranty, and a roofer can decline a workmanship claim on a cooked roof. The ventilation page.
• Installation outside the instructions. Wrong nail count, nails above the strip, wrong exposure, woven valleys with laminated shingles, no starter. The manufacturer’s warranty excludes it; the workmanship warranty is what covers it.
• Overlays, on many lines: a second layer voids or shortens the material warranty.
• Foot traffic: the satellite installer, the chimney sweep, you with the Christmas lights. Scuffed shingles are not a defect.
• Pressure washing and harsh roof cleaners strip granules and void most material warranties.
• Ice dams, wind over the rating, hail on a non-Class-4 shingle, falling trees. Insurance, not warranty. The storm damage page.
• Not registering an enhanced warranty within the window, which the roofer was supposed to do.

Transfer on sale

Most manufacturer warranties transfer once, to the next owner, if the transfer is requested within a set time (often 60 days of the sale) and sometimes with a fee, and the coverage usually drops to a shorter prorated term after transfer. Workmanship warranties transfer if the contract says so. If you are selling, the warranty documents, the registration and the roofer’s invoice go in the folder for the buyer; a documented 5-year-old roof is a selling point and an undocumented one is a question.

What to keep

• The contract with the workmanship warranty term in it.
• The quote naming the shingle, line and lot if you can get it (it is on the bundle wrappers; photograph one).
• The manufacturer’s warranty document for that product, current edition.
• The enhanced warranty registration confirmation, if bought.
• The roofer’s photos of the deck, membrane and flashings during the job, and your own.
• The invoice, paid, with the date, because every warranty runs from it.

Sources and further reading

• IKO: Canadian-made shingles; the warranty and the technical data sheets are on the site.
• GAF: Timberline shingles and the certified-installer program.
• Owens Corning: Duration shingles and the SureNail strip the wind rating depends on.
• CertainTeed: Landmark shingles and the SureStart warranty terms.