British Columbia · Roof warranties explained
Metal roof warranties, explained
A roof warranty usually covers the material (from the manufacturer) and its finish. The number of years matters less than who the warrantor is, whether coverage shrinks over time, what's excluded, and how it transfers. On an Interlock® roof, the Guardian Lifetime Limited Material Warranty covers material and finish.
Reviewed by Scott Plumptree, Director of Marketing, The Interlock Group · Updated October 8, 2026
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Material
Guardian Lifetime Limited Material Warranty
From the manufacturer; original purchaser; transfers once.
Finish
30 Year Alunar® Coating Warranty
On the factory finish.
What to look for in a roof warranty
Material
Covers the roofing product itself against defects. Issued by the manufacturer, or sometimes by the contractor reselling it. Read who the warrantor is: a manufacturer's warranty stands even if the contractor stops trading.
Finish (coating)
Covers the paint: usually chalking, fading and peeling, measured against stated limits. It is often a separate document with its own term.
Wind and other ratings
Wind coverage, fire ratings and impact ratings usually depend on the roof being installed to the manufacturer's specification. Ask what installation the rating assumes.
What a "50-year" warranty can mean
A number of years on a roofing brochure tells you the longest possible term, not what you'll be paid in year 30. Before you compare warranties, find the answers to these in the warranty document itself, not the sales sheet.
- Is coverage reduced over time (pro-rated)? If so, how much is left at year 10, 20 and 30?
- Does it cover material only, or labour to replace the material too?
- Who is the warrantor, and in which province or country is it based?
- Does it transfer when you sell, how many times, and is there a fee or a deadline to register the transfer?
- What is excluded: ice damming, cosmetic dents, coastal or industrial exposure, foot traffic?
- How, and how quickly, must a claim be made?
The warranty on an Interlock® roof in BC
| Guardian Lifetime Limited Material Warranty | |
|---|---|
| Issued by | Interlock Roofing, the manufacturer (Delta, BC) |
| Covers | The aluminum roofing material and its factory finish |
| How long | As long as the original purchaser owns the home |
| Register | Within 60 days of installation |
| Transfer | Once, to the next registered owner, with coverage to 50 years from installation; notice within 60 days of the sale and a $300 fee |
| Report a problem | In writing, within 30 days of the issue becoming known |
| Exclusions to know | Workmanship; severe weather and Acts of God; hail larger than 38 mm; condensation; ice-damming; normal wear including minor scratches and dents; installation not to manufacturer specification |
| Claims | guardian@interlockroofing.com |
From the Guardian warranty. The finish also carries a 30 Year Alunar® Coating Warranty. Read the full warranty before you sign.
Roofs covered by these warranties
Recent Interlock® roofs installed by our own BC company, in Peachland first, then elsewhere in BC. Tap a roof to see all of its photos.
Storm, tree and other damage
A tree coming down in a windstorm is not a warranty matter: damage from severe weather and other Acts of God is excluded from the manufacturer's Guardian warranty, so it is usually a home insurance claim. Photograph the damage before anything is moved, then call our service line at 1-866-588-7663 or email bcservice@interlockroofing.com and we'll arrange the repair.
Questions, answered
What does a 50-year limited roof warranty cover?
It depends entirely on the document. Many 50-year roofing warranties cover the material only, reduce coverage over time, and exclude workmanship. Check whether it is pro-rated, whether labour to replace material is included, who the warrantor is, and how it transfers.
What does the Guardian Lifetime Limited Material Warranty cover?
The aluminum roofing material and its factory finish, for as long as the original purchaser owns the home. It transfers once, to the next registered owner, with coverage to 50 years from installation. Workmanship is excluded, and ice damming is a stated exclusion.
Is a metal roof warranty transferable when I sell?
The Guardian material warranty transfers once, to the next registered owner, with coverage to 50 years from installation.
Does the warranty cover a tree falling on my roof?
No. Damage from severe weather and other Acts of God is excluded from the manufacturer's Guardian warranty, so it is usually a home insurance claim. Call 1-866-588-7663 or email bcservice@interlockroofing.com and we'll arrange the repair.
How do I make a warranty claim?
In writing to guardian@interlockroofing.com within 30 days of the issue becoming known.
Sources
Product specifications are the manufacturer's (Interlock Roofing). Install counts are from our own job book. Reviewed by Scott Plumptree, October 8, 2026.
Read the warranty with us.
A fixed price in writing after one visit, on Zoom or at your home. Most BC homeowners choose Zoom. Interlock Metal Roofing (BC) Ltd. · 9969 River Way, Delta, BC V4G 1M8
