Roof warranties in Canada: manufacturer vs workmanship, proration and transfers

A new roof in Canada usually comes with two separate warranties: the manufacturer's warranty on the product (shingles, membranes, metal panels), which covers manufacturing defects and is often prorated after an initial period, and the contractor's workmanship warranty, which covers leaks and failures caused by installation and is only as good as the contractor's willingness and ability to honour it. Most leaks on new roofs are installation problems, so the workmanship warranty matters more in the first years. Manufacturer coverage can be voided by installation that does not follow the instructions, poor ventilation or failure to register. Provincial consumer and civil law adds baseline protections that exist whether or not a warranty is written.

This guide is part of roofing problems and official sources. Warranty terms vary by product and contractor; the descriptions below are general patterns, not any manufacturer's actual terms.

The two warranties side by side

	Manufacturer warranty	Workmanship warranty
Who gives it	Product maker	Your contractor
Covers	Manufacturing defects in the product	Installation errors: flashing, nailing, ventilation details, leaks
Typical length	Long, often "limited lifetime" for asphalt shingles, prorated after an initial period	From one year to ten years or more, depending on the contractor; longer under some manufacturer-backed programs
Labour	Often covered only in the initial period, or only with enhanced programs	Usually covers labour
Transfer	Often transferable once, sometimes with notice and fee	Varies; often not unless stated
Main risk	Proration, exclusions, void for non-compliant installation	Contractor goes out of business

"Lifetime" and proration explained

"Limited lifetime" warranties on asphalt shingles commonly give full (non-prorated) coverage for a first period, after which the amount paid declines each year. They may also define "lifetime" as the period the original owner owns the home, with reduced terms after a transfer.

Illustrative example (not real terms): a warranty gives full material coverage for the first 10 years, then the manufacturer's share reduces each year. Suppose that in year 18 its share is 30% of the original material cost. A defect requires replacing $4,000 of shingles (material only):

Manufacturer pays 30% × $4,000 = $1,200.
You pay the remaining $2,800 of material, plus labour, tear-off and disposal if not covered.

Read the actual proration schedule in the warranty document.

What voids or limits manufacturer coverage

Installation not following the manufacturer's written instructions (nailing pattern, starter course, underlayment, slope limits).
Inadequate attic ventilation, which many shingle warranties explicitly require.
Using non-approved accessories when an enhanced warranty requires a "system" of the manufacturer's components.
Not registering the warranty within the deadline, where registration is required.
Damage from storms, foot traffic, ice dams, ponding on low slopes or improper repairs, which are usually excluded as not manufacturing defects.

Ask your contractor which warranty level will be registered and to give you the registration confirmation. Keep the product wrapper or product name, colour and lot information.

Workmanship warranty: what to get in writing

Length in years.
What it covers: leaks and failures arising from the installation.
Exclusions: storm damage, other trades' work, lack of maintenance.
How to make a claim and how fast the contractor must respond.
Whether it transfers to a buyer.
Whether it is backed by the manufacturer (some enhanced programs cover workmanship by certified installers).

A long workmanship warranty from a business that might not exist in five years is worth less than a shorter one from an established business; neither is worth much if it is only verbal.

Rights beyond the written warranty

Provincial law adds protection:

Ontario: the Consumer Protection Act, 2002 deems services to be of a reasonably acceptable quality.
Quebec: the Civil Code of Québec makes a contractor liable for poor workmanship discovered within one year after acceptance of the work, and for the loss of the work within five years after completion in cases covered by the Code. The Consumer Protection Act also sets warranty rules for goods.
Other provinces: sale of goods and consumer protection statutes imply terms about quality and fitness, and contract law allows claims for breach.

New-home warranty programs (Tarion in Ontario, the Quebec guarantee plan for new residential buildings, BC's home warranty insurance for new homes) generally apply to new homes, not to a re-roof of an existing house.

Making a warranty claim

Notify the contractor in writing as soon as you notice the problem, with photos.
Allow access for inspection.
If the contractor says it is a product defect, ask them to file with the manufacturer, or file yourself with proof of purchase and installation date.
If refused, ask for the reason in writing.
Get an independent assessment of cause.
Escalate: see how to complain about a roofer.

Siding warranties

Vinyl, fibre cement and engineered wood siding warranties follow the same pattern: product warranty from the manufacturer, often with conditions on clearances, fastening and finish; and a workmanship warranty from the installer. Finish warranties on pre-finished products may be separate from the substrate warranty.

Selling your home

Buyers and inspectors ask about roof age and warranty. Keep a file with the contract, invoice, product details and warranty registration. Check whether a transfer requires notifying the manufacturer within a deadline after the sale.

FAQ

Is a 50-year shingle better than a 25-year one?

The number is a warranty label, not a lifespan prediction. Compare the non-prorated period, wind rating, labour coverage and the installer's warranty rather than the headline years.

Does a manufacturer warranty cover ice dam leaks?

Usually not, because ice dams are caused by heat loss and ventilation, not product defects. See ice dams, ventilation and flashing failures.

Will insurance cover what the warranty doesn't?

Only sudden damage from a covered peril; not wear, defects or poor workmanship. See home insurance roof claims.

Sources

Consumer Protection Ontario — quality of services
Office de la protection du consommateur — warranties in Quebec
LégisQuébec — Civil Code of Québec, contracts of enterprise
Tarion — Ontario new home warranties (for comparison)
Consumer Protection BC — consumer rights in BC