Lethbridge and area · Made in Canada · Since 1999
Interlock® aluminum roofs for Lethbridge and the southwest corner of Alberta, from Raymond and Cardston to Pincher Creek and Blairmore, installed by our own Alberta crews.
On Zoom or at your home, at a time that suits you. You get a fixed price in writing.
The collection
Also offered in solid copper.
Compare them side by side
The certified Interlock® roofing installer for Alberta
Manufactured at 9969 River Way, Delta, BC
GuildQuality GuildMaster Award for service excellence
Better Business Bureau rating
Baeumler Approved
Approved contractor profileBuilt for Lethbridge wind
Ask anyone in Lethbridge about the weather and the wind comes up first. West of the city, toward Pincher Creek and the Crowsnest Pass, chinooks come straight off the mountains, hail reaches this part of the province too, and in 2017 fire burned through Waterton. This is what each one means for a roof, and where an Interlock® aluminum roof stops being the answer.
Wind
On January 19, 2021 a gust of 130 km/h was recorded in Lethbridge, Lethbridge News Now reported, and more than 2,000 customers on the north side lost power. Wind like that starts on asphalt at the tabs and the ridge caps. Interlock panels hook into one another on all four sides, the fasteners are covered by the next course, and wind resistance is warranted to 193 km/h (120 mph) installed to manufacturer specification.
Hail
In September 2025 Insurance Bureau of Canada said hailstorms had caused about $6 billion of insured damage in Alberta over the previous five years. Interlock's Slate, Shake, Cedar Shingle and Mediterranean Tile aluminum panels carry a UL 2218 Class 4 impact rating, listed by Intertek under Delta Building Products. A rating is a test result, not a promise: large hail can dent aluminum, and the material warranty excludes hail larger than 38 mm (1.5 in).
Chinooks
Around Pincher Creek strong chinook winds often blow off the mountains, and a frozen winter day can turn mild in a few hours before the cold comes back. Each thaw sends meltwater down the roof and each freeze locks it in again. Aluminum absorbs no water, so that cycle has nothing in the panel to split, and the finish is covered by the 30 Year Alunar® Coating Warranty.
Source: Wikipedia, Pincher Creek ↗
Wildfire
Parks Canada reports that the Kenow Wildfire established itself in Waterton Lakes National Park on September 11, 2017 and burned 19,303 hectares of the park, destroying the visitor centre and the Crandell Mountain campground. For houses near Waterton, Twin Butte and the forested Crowsnest Pass, FireSmart Alberta recommends Class A roofing. We can build yours as Class A Fire Rated Available, as a complete assembly, with two layers of GAF VersaShield® over 12 mm (15/32-inch) plywood under the panels. No roof is fireproof.
Permits
The City of Lethbridge lists re-roofing, with painting and same-size window replacement, as work that does not need a building permit. Repairing or altering the structure is permit work, and the City suggests speaking with a Safety Codes Officer before you start. Outside the city the county or town rules apply, and we check them for your address.
Snow
Snow slides off aluminum in slabs instead of sitting on the roof, so wherever a slab would come down on steps, a deck or a parked car, snow guards go into the quote. Ice dams start under the roof, when attic heat melts snow that refreezes at the cold eaves. The material warranty excludes ice damming, so we look at insulation and ventilation with you instead of claiming the roof will cure it.
City of Lethbridge, a city since May 9, 1906, on the Oldman River about 210 km southeast of Calgary. Wikipedia ↗
West Lethbridge, home to the University of Lethbridge; the north side, which includes the former hamlet of Hardieville; and the south side with downtown. Wikipedia ↗
Lethbridge County, called the County of Lethbridge until December 4, 2013. Its offices are in the city. Wikipedia ↗
Not required by the City of Lethbridge; structural repair or alteration is permit work. City of Lethbridge ↗
A 130 km/h gust in Lethbridge on January 19, 2021. Lethbridge News Now ↗
Our own crews, from our office at 210, 3750 46 Ave SE in Calgary. We have no Lethbridge office; consultations are on Zoom or at your home.
Product figures are the manufacturer's: interlockroofing.com ↗
Homes and beyond
The same interlocking aluminum system goes on a family home, a condo or townhouse complex, or a church. We install it across Alberta on:
Antarctica · U.S. National Science Foundation
Interlock® standing seam roofing and Black Diamond siding on six SPOT modules that travel between McMurdo Station and the South Pole, in −51 °C and winds up to 161 km/h. More than 32,000 completed Interlock® roofs across Canada and the USA, and these at the bottom of the world.
The Antarctica project ↗Roofs around Lethbridge
Tap a roof to see every photo full screen. Save the ones you like, send them to family, or pick two to four to compare side by side.
SlateColeman, Alberta · August 2026
ShakeWarner, Alberta · July 2026
ShakeWaterton Park, Alberta · August 2025
SlateSturgeon County, Alberta · September 2026
Cedar ShingleDelia, Alberta · September 2026
Cedar ShingleFoothills County, Alberta · September 2026
Cedar ShingleStony Plain, Alberta · September 2026
SlateCalgary, Alberta · September 2026
ShakeCrooked Creek, Alberta · August 2026
In their own words
★★★★★
“Good bunch of guys on this project. Enjoyed working with them.”
Harvey Tetzlaff and Hope T. · Warner · 2026
See this roof 2 photos · Musket Grey Shake★★★★★
“Awesome service and new roof that looked like it is now armour plated.”
Glenn S. · Lethbridge · 2024
★★★★★
“There's a little joint on the top of the roof that they didn't quite do right.”
S.W. Warren H. · Lethbridge · 2018
★★★★★
“It was really cold when the workers were here. We were happy with the roof.”
Boyd and Colleen B. · Coutts · 2017
★★★★★
“The installation crew left our gate open at the end of the day after they cleaned up and our dog escaped.”
Brian and Sandra D. · Lethbridge · 2015
★★★★★
“It looks like a good product and good materials, but overall it was just too expensive.”
KEN L. · Lethbridge · 2015
★★★★★
“A fax was sent to make an adjustment to our order but the change was never completed. Communication breakdown somewhere?”
Brad and Tammy R. · Lethbridge · 2014
★★★★
“They need to be clearer on what they cover with the roofing project, and what they did not cover.”
Calvin S. · Lethbridge · 2015
★★★★★
“I like the look of the finished product, however it is too early to give an honest opinion until we have been through a couple of winters.”
Helen and Raymond E. · Crooked Creek · 2026
See this roof 1 photo · Colonial Brown Shake★★★★★
“I wish the project was cheper, but you get what you pay for, so I am happy.”
Kelly and Carolynn T. · Norglenwold · 2026
★★★★★
“We recently installed a new Interlock Roofing System, and we couldn’t be happier with the decision. Knowing it’s backed by a limited lifetime, non-prorated, fully transferable 50-year warranty gives us real peace of mind.”
Denis D. · St. Paul · 2026
★★★★★
“Everything was handled very professionally. Nothing comes to mind. None”
Wayne and Liz P. · Westlock · 2026
★★★★★
“My project was a new build. I thought it could've been completed sooner, but they were waiting for other people to do their jobs which is something I believe Interlock Metal Roofing can improve on. It was done okay though.”
Stuart D. · Bassano · 2025
★★★★★
“Communication on the start date could be improved. We are happy with our roof. Looking forward to the durability of the product.”
Chad and Kayanne T. · Cochrane · 2025
See this roof 3 photos · Black Cedar Shingle★★★★★
“We appreciated the sales person Bryan making adjustments so we could afford this product. In the end it worked out for your company because we did the shop as well. The installers did an excellent job. not that i can think of”
Kevin and Wendy C. · Blairmore · 2025
★★★★★
“The office staff was slow to respond to our needs. Along with the delivery, which was late.”
Calvin and Anne S. · Waterton · 2019
★★★★★
“We didn't realize the installer was coming that day because it was not confirmed. Other than that we were happy.”
Cari and Ashley G. · Lethbridge · 2017
★★★★★
“I called about one or two things and didn't hear back from them. The people at the office need to do a little better.”
Dwaine and Janet N. · Raymond · 2015
★★★★★
“It was a pleasure working with the Interlock Roofing crew and staff. Not only did they finish the job in a timely manner but they completed the job almost two months earlier than was scheduled, allowing us to go on our scheduled vacation.”
Douglas and Dawn M. · Lethbridge · 2015
★★★★★
“Interlock Roofing could have improved on the timing of the installation during cold and snowy weather, but I also know the weather is unpredictable.”
Dave and Gina M. · Granum · 2015
★★★★
“I cannot think of anything Interlock Roofing could have improved on.”
Rod and Nancy K. · Twin Butte · 2020
★★★★
“Materials delivered early February but project not started until end of April - few delays after that but satisfied with finished project”
Ron and Bev G. · Lethbridge · 2015
★★★★★
“Pleasant workers who were willing to tell us the steps they were going through. Cleaned up after themselves.”
Ken and Kathy S. · Rimbey · 2026
★★★★★
“Luis was excellent. He should up with a great attitude and ready to take care of our problems. I would definitely recommend Luis for everyone.”
Sean M. · Calgary · 2026
★★★★★
“Excellent product. Excellent install. Excellent value. Thank you Interlock Metal Roofing!”
Jeff J. · Crossfield · 2026
See this roof 2 photos · Deep Charcoal Cedar Shingle★★★★★
“My project required significant smart venting and the sales rep was very resourceful in assessing the home and the smart venting needs”
Nick and Fatima V. · Airdrie · 2025
★★★★★
“They're wonderful. They have been very safety conscious, they have provided excellent work, they displayed excellent work ethics, and they were extremely careful about how to work within the property. Very prompt and very professional.”
Jalees Razavi and Birsen R. · Calgary · 2025
See this roof 9 photos · Deep Charcoal Slate★★★★★
“Luis was very good to work with. Installed snow guards very quickly after we requested the work. Great roof!”
Sarah B. · Calgary · 2025
Lethbridge roofing profiles: slate, cedar shingle, shake, Mediterranean tile, standing seam & solid copper
The look belongs to your home. The performance belongs to the metal. Every profile needs a minimum 3/12 roof slope.
A composed silhouette
The formal character of slate at a fraction of the weight, in aluminum that cannot rust.
Familiar warmth
The look of a cedar roof, with nothing to rot, split or take on water in the grain.
Deep shadow lines
Hand-split texture and depth: the usual replacement when a cedar shake roof has had its last re-treatment.
Sculpted, not heavy
The barrel-tile silhouette without the weight of concrete or clay.
Clean lines
Clean vertical lines for a modern home or a cabin, in the same aluminum.
A living metal
Copper weathers over time. Usually a bay, a porch or a turret rather than a whole house.
Where we've worked
Lethbridge roofing from Interlock Metal Roofing (Alberta) Ltd., the certified Interlock® installer for Alberta. We roof houses on all three sides of the city, West Lethbridge, the north side with the old Hardieville area, and the south side around downtown, and in the towns south and west of it: Raymond, Warner, Cardston, Fort Macleod, Granum, Pincher Creek, and Blairmore and Coleman in the Crowsnest Pass. Interlock Roofing makes the panels in Canada at its plant in Delta, BC. Our own crews install them, travelling from our Calgary office, and the consultation happens on Zoom or at your home.
Completed Interlock® roofs in Lethbridge and the towns of the southwest, from our job book. A place with three or more has a page of its own.
Coaldale, Taber, Barnwell, Vauxhall and Hays
coaldaleroofing.com ↗Nanton, Stavely and Claresholm
nantonroofing.com ↗One office, in Calgary, serves Lethbridge, its county, Cardston, the County of Warner, Fort Macleod, Pincher Creek and the Crowsnest Pass, with our own crews. Beyond Lethbridge, Cardston, Fort Macleod, Pincher Creek and the Crowsnest Pass: calgarymetalroofing.com for Calgary & Southern Alberta, same company and warranties. Not sure which one your address falls in? Ask us.
The project map
Every pin is a real, completed Interlock® roof with its profile, colour and install year. Zoom in on your street.
Why Lethbridge homeowners pick aluminum
Our crews
Interlock Metal Roofing (Alberta) Ltd. sends its own crews to every Lethbridge job. The person who measures your roof and the company named on your labour warranty are the same Alberta business, with its office in Calgary.
Profiles
Slate is the most chosen profile in our Lethbridge job book, well ahead of the legacy Interlock Shingle that many older roofs in the city carry. Today the choice is Slate, Cedar Shingle, Shake, Mediterranean Tile or Standing Seam, in nine colours, on any roof with a slope of 3/12 or more.
Tear-off
Cedar shakes and shingles, concrete tile and natural slate always come off first. A single layer of asphalt can stay under the new roof only if our inspection finds it suitable; a second layer cannot. The written quote says which applies before you sign.
Weight
The panels weigh roughly 2 to 3.5 kg per square metre, a small fraction of concrete tile, so an older bungalow or a farmhouse does not have to carry tile-like weight. We still look at the deck and the rafters during the inspection.
Warranties
Interlock Roofing, the manufacturer, covers the aluminum and its finish under the Guardian Lifetime Limited Material Warranty for as long as the original purchaser owns the home, transferable once, workmanship excluded. Our own 10 Year Limited Labour Warranty covers the installation.
Farmyards
Around Raymond, Cardston and the County of Warner the house is often one roof among several. The shop, garage and barn can take the same profile and colour, each priced as its own line, so you can roof them together or one at a time.
Recycled
And the last tear-off your house is likely to need.
The metallurgy, coatings and test reports are the manufacturer's to explain: interlockroofing.com ↗
Every Interlock® panel we install is manufactured in Canada by Interlock Roofing at its plant at 9969 River Way in Delta, BC.
Interlock Metal Roofing (Alberta) Ltd. was founded in 1999 and is based in Calgary, with one office serving Calgary, Edmonton and the rest of Alberta. Canadian owned and operated for 27 years.
The roof is made in Canada and installed in Alberta by our own company. It never crosses a border on its way to your home.
Upcoming shows
Lift a panel, feel the weight, see every colour in daylight and ask the people who install it. Come find us at a show near you.
Interlock Metal Roofing (Alberta) Ltd., with its own crews. We are the certified Interlock® roofing contractor for Alberta, founded in 1999, and our only office is in Calgary. Interlock Roofing makes the panels in Canada at its plant in Delta, BC. We are BBB Accredited with an A+ rating, Baeumler Approved, and a 2026 GuildQuality GuildMaster Award winner.
Not inside the city, as a rule. The City of Lethbridge lists re-roofing among the jobs that do not need a building permit. Repairing or altering the structure, for example rebuilding rotten decking or rafters, is permit work, and the City recommends checking with a Safety Codes Officer first. Outside the city, the county, town or village where you live sets the rules. We confirm what applies to your address before work starts.
It is designed for both, within limits. Wind resistance is warranted to 193 km/h (120 mph) installed to manufacturer specification. For hail, Interlock's Slate, Shake, Cedar Shingle and Mediterranean Tile panels carry a UL 2218 Class 4 impact rating, listed by Intertek under Delta Building Products. No roof is hail-proof: the material warranty excludes hail larger than 38 mm (1.5 in), and storm damage is a matter for your home insurance. Ask your insurer how it treats an impact-rated roof; we can give you the listing.
Lethbridge and Lethbridge County, Coalhurst, Picture Butte, Nobleford and Monarch; Raymond, Warner, New Dayton and Coutts; Cardston, Glenwood and Spring Coulee; Fort Macleod and Granum; Pincher Creek, Twin Butte and Waterton; and Blairmore, Coleman and Burmis in the Crowsnest Pass. The rest of Southern Alberta is on calgarymetalroofing.com, with the same company, office and warranties.
No. Our only office is in Calgary, at 210, 3750 46 Ave SE, and our crews travel from there. The consultation can be on Zoom or at your home, and either way you get a fixed price in writing.
Our cost page lists real contract prices from the Interlock® roofs we signed across the Calgary & Southern Alberta market in 2025 and 2026. Treat them as a rough guide only: prices vary from job to job with structural and other conditions, and an in-home roof consultation is required for an accurate price. The consultation and the written quote are free.
Free, no obligation
A free consultation on Zoom or at your home: we go through profiles and colours with you, measure the roof, and give you a fixed price in writing. No pressure, and an honest date for the install.
Interlock Metal Roofing (Alberta) Ltd. · 210, 3750 46 Ave SE, Calgary, AB
Lifetime refers to the manufacturer's Guardian Lifetime Limited Material Warranty: material and finish, for as long as the original purchaser owns the home, transferable once, workmanship excluded. Warranty details
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