Every roof in Alberta comes with two warranties, and homeowners almost always read the wrong one. The manufacturer's “limited lifetime” document covers the shingle against manufacturing defects, on a sliding scale that is worth very little after the first decade. The workmanship warranty covers the thing that actually fails: the installation.
This guide explains what each one pays, what silently voids them in this climate, how to find the roof warranty you already have, and what happens to it when you sell the house.
The short answer
Two documents, two different signatures. The manufacturer warrants the product against defects and explicitly not against bad installation. The contractor warrants the installation for a stated number of years. Nearly every real-world roof failure — leaks at flashing, nails in the wrong zone, valleys detailed badly — falls to the second document, which is the one people forget to ask for.
The manufacturer's warranty, in plain terms
What “limited lifetime” actually means
Not the life of the roof. GAF's published warranty comparison defines Lifetime as “as long as you, the original owner(s) … own the property where the shingles … are installed”, and caps it at 40 years when the owner is a company, a condominium corporation or any other non-individual. Sell the house and, unless transfer is done properly, the word stops applying.
The non-prorated period is the number that matters
Inside every limited warranty there is a shorter window during which the manufacturer covers the full value of the defective material. GAF calls it the Smart Choice Protection Period and sets it at 10 years on the base warranty.
IKO calls its equivalent the Iron Clad Protection Period and puts it at 3 to 15 years depending on the product. After that window, IKO says, shingles are “subject to a prorated amount of the replacement shingles”.
What proration actually pays
GAF publishes the arithmetic: after the non-prorated period the remedy “will be reduced to reflect the use you have received”, calculated by dividing the months elapsed since installation by the months in the warranty term — deemed to be 600 months for years 11 to 40 of a Lifetime warranty. Twenty years in, that is 240 of 600 months used.
Two things are worth noticing. First, the calculation is on material, so labour, tear-off and disposal are generally yours. Second, it applies to a manufacturing defect, which is a rare finding — what the paperwork promises against what a roof does in this climate is covered in how long a roof lasts in Alberta.
What it never covers
- Installation. IKO puts it in one line: the limited warranty “does not warrant against incorrect application”.
- Hail. An impact rating is a test result, not a warranty against storm damage — the trade-offs are in roofing materials for Alberta hail.
- Wind above the rated speed stated in the document for your product.
- Damage caused by other work — satellite dishes, solar mounts, holiday lights screwed through shingles.
- Ventilation failures. Almost every asphalt warranty conditions coverage on ventilation meeting the manufacturer's requirement.
The workmanship warranty
This is the document that decides most disputes, and it is written by the contractor, not by the factory. Terms in this market vary from a couple of years to a decade, and the length matters less than whether it exists in writing, names a scope and survives the company.
How the Alberta version works
Alberta has an institutional model for this. Under the Alberta Roofing Contractors Association's warranty programme, workmanship claims in years one and two go to “the roofing contractor of record identified at the top of each warranty certificate”.
Claims in the remainder of the term go in writing to ARCA itself — the part that survives a contractor closing its doors — and must be reported no more than 30 days after the leak occurs.
The same guide lists what the certificate does not cover: premature deterioration of the roofing materials, blocked drainage and debris, “leaking caused by alterations to the roofing system by others”, and damage from “acts of God, inclement weather, the work of other trades, vandalism or abuse”. Note the last one: hail is not a warranty claim anywhere.
What to ask for, in writing, before you sign
- The workmanship warranty term, in years, on the contract — not in an advertisement.
- What it covers: leaks only, or flashing, penetrations and metal work as well.
- What voids it, listed explicitly.
- Who honours it if the company stops trading — an association-backed certificate, or nobody.
- Confirmation that the manufacturer's product registration will be completed, and a copy of the registration when it is.
A verbal “we stand behind our work” is not a warranty. The rest of the pre-signature checklist is in how to choose a roofing contractor in Edmonton.
What quietly voids a roof warranty in Alberta
- Under-ventilated attic. The most common one here, and the easiest to prove against you after the fact: intake and exhaust have to meet the manufacturer's requirement, and in Edmonton they frequently do not. The standard is explained on attic ventilation and roof vents.
- Roofing over the old layer. It hides the deck, traps heat and, in many warranty documents, disqualifies the installation. A full tear-off is what roof replacement should mean.
- Other trades on the roof. Anything drilled, mounted or walked on by somebody else can be excluded, as ARCA's exclusion for alterations by others shows.
- Never registering the product. Extended manufacturer coverage often requires registration within a set number of days after installation.
- Shovelling snow off shingles. Cold asphalt is brittle; the damage looks like abuse, and abuse is excluded.
Finding it, transferring it, and knowing when it is the wrong document
Finding the warranty you already have
Four places, in order: the contractor's closing package; the manufacturer's registration confirmation, usually an email; the invoice, which names the shingle line and colour; and the previous owner's paperwork, which is worth asking for at purchase.
If a claim has to be made and the roof is under snow, IKO's guidance is that you may submit in the spring rather than rush a bad inspection.
Transfer, when you sell
Transfer is not automatic and it is not open-ended. GAF permits a second owner to inherit Lifetime coverage only if the transfer is done properly during the Smart Choice Protection Period; IKO states that transfer terms “vary by year and product”.
The practical rule: read the transfer clause on the actual document, do it inside the window, and hand the buyer the paperwork rather than a promise.
New builds: the provincial layer
If the house is new, a third document exists. Alberta requires new home warranty coverage where the building permit was applied for on or after 1 February 2014, and alberta.ca sets out the minimum tiers:
- one year on labour and materials;
- two years on delivery and distribution systems;
- five years on building envelope protection;
- ten years on major structural components.
A roof leak on a four-year-old house is therefore an envelope question before it is a shingle question, and registered homes can be looked up on the province's public registry.
Warranty or insurance? The line that saves arguments
Weather goes to your insurer; workmanship goes to your roofer; defects go to the manufacturer. Hail, wind, ice and falling branches are covered perils, not warranty events — that is roof insurance claims territory.
A leak at a chimney on a two-year-old roof is workmanship. A whole slope shedding granules while identical shingles opposite are fine is the rare case worth a defect claim. Metal adds a wrinkle, because panel, coating and fasteners are often warranted separately — see metal roofing in Edmonton.
To recap: the manufacturer's limited lifetime warranty is tied to your ownership, pays in full only during a short non-prorated period, prorates the material after it and excludes installation entirely.
The workmanship warranty is the one that answers for leaks, flashing and detailing, and it is only as good as the paper it is written on and the body standing behind it. Attic ventilation, a second layer, other trades on the roof and missed product registration are the quiet ways both get lost, and transfer at sale has a window you can miss.
Before you sign anything, ask for the workmanship warranty in writing, with its term, its scope and its exclusions on the contract. If you want to know what condition your current roof and its ventilation are actually in — the two things every warranty argument turns on — start with a documented roof inspection.