The Last Roof Quote: a fixed price to Never Re-Roof Again.

We are the certified Interlock® roofing contractor for Ontario, installing Interlock® roofs since 1998 from our office at 2800 Argentia Rd #5 in Mississauga. We install one roofing system, the Interlock® aluminum roof, made in Canada by Interlock Roofing at its plant in Delta, BC, and installed in Ontario by our own company. We are BBB Accredited with an A+ rating, Baeumler Approved, a Metal Roofing Alliance member and a GuildQuality GuildMaster Award winner in 2025 and 2026.

Five aluminum profiles (Slate, Cedar Shingle, Shake, Mediterranean Tile and Standing Seam), also available in solid copper. Slate is the profile we sell most, and Shake and Cedar Shingle are the usual choice when an owner wants to keep the look of a wood roof. Every profile needs a minimum 3/12 roof slope. We bring samples to the consultation so you can see each one against your house.

Class A is the highest fire classification for roof coverings under ASTM E108, and it rates a complete roof assembly rather than a covering alone; in Canada the matching standard is CAN/ULC-S107. The roof covering, underlayment and deck are tested together, which is why the same panel can carry different classifications on different assemblies. On our roofs, Class A Fire Rated Available, as a complete assembly: two layers of GAF VersaShield® over 12 mm (15/32-inch) plywood, per ASTM E108. When a roofer says their roof is Class A, ask which assembly the rating applies to.

Two. The manufacturer, Interlock Roofing, gives the Guardian Lifetime Limited Material Warranty on the aluminum material and its factory finish. We, Interlock Metal Roofing (Ontario) Ltd., give a 10 Year Limited Labour Warranty on the workmanship of the installation. They are separate documents with separate terms, and you can read both in full before you buy.

It depends on your roof, so we price each house after a free consultation instead of publishing a number. The biggest factors are roof area, pitch and complexity (valleys, dormers, skylights and chimneys), what is under the old roof, the profile you choose, and options such as the Class A Fire Rated Available assembly, snow guards or hidden gutters. Steep lots and hard-to-reach cottage sites change the logistics too. You get a fixed price in writing, and anything the deck needs goes into that quote, not into a change order later.

We take work across southern, central and eastern Ontario: the GTA, including Toronto, Mississauga, Oakville and Markham, and Barrie; Kitchener and Guelph; Hamilton, Simcoe and Niagara Falls; London, Woodstock and Chatham; Muskoka, Gravenhurst and Huntsville; Kawartha Lakes and Peterborough; Kingston and Belleville; and Ottawa, Almonte and Cornwall. It is the same company and the same warranties everywhere. We don't regularly serve Northern Ontario, but we consider projects there case by case, so ask.

No. Interlock Roofing manufactures the panels at its plant in Delta, BC, and issues the Guardian Lifetime Limited Material Warranty on the material. Interlock Metal Roofing (Ontario) Ltd. is the Ontario company, based in Mississauga, that sells and installs them and gives you the 10 Year Limited Labour Warranty on the installation. The two work closely, but they are separate companies with separate warranties.

Yes. Interlock® panels are manufactured by Interlock Roofing in Delta, BC, and installed in Ontario by our own company, Interlock Metal Roofing (Ontario) Ltd. Made in Canada, installed in Ontario: the roof never crosses a border on its way to your home, and the company that installs it is the one that stands behind the workmanship.

Our job book records 8,261 completed Interlock® roofs in Ontario since the company was founded in 1998. Ottawa, Toronto and Mississauga have the most, followed by Scarborough, Brampton, Hamilton, London, Etobicoke, Kitchener and Kingston. Every completed roof is listed by town, so the town pages show the install record for your part of the province, including the profiles and colours chosen there.

Ontario has no compulsory provincial licence for roofers: Skilled Trades Ontario lists Roofer as a non-compulsory trade. So the checks that matter are WSIB coverage, liability insurance, a municipal licence where your city requires one, a written contract and a warranty you can read in full. Ask us, and any other roofer, for a WSIB clearance certificate and an insurance certificate. You can also look up a contractor's clearance yourself through the WSIB's online clearance service. Interlock Metal Roofing (Ontario) Ltd. holds municipal contractor licences in Toronto (Building Renovator T85-3589700), Hamilton (Building Repair 14 205557), Brantford (General Trades 13 000983GT) and Halton Hills (BUSL-08-0134).

On our reviews page, which shows reviews from Ontario homeowners only, with nothing borrowed from another province or state. Our HomeStars, Baeumler Approved and BBB profiles are public too, and the BBB profile shows every complaint and our response. GuildQuality named Interlock Metal Roofing (Ontario) Ltd. a GuildMaster Award winner in 2025 and 2026.

Call or visit our Mississauga office at 2800 Argentia Rd #5, Mississauga, ON L5N 8L2, Monday to Friday, 9:00 a.m. to 5:00 p.m., or email scott@interlockmetalroofing.ca. Sales visits are by appointment, and most consultations can be done on Zoom. Existing customers with a service or labour warranty question can reach onservice@interlockroofing.com or 1-866-588-7663, and Guardian material warranty claims go to guardian@interlockroofing.com.

Aluminum has been known to last over 100 years, because it does not rust or rot and absorbs no water to freeze and thaw inside it. That is a property of the metal, not a promise about any one roof. The written terms are the warranties: the manufacturer's Guardian Lifetime Limited Material Warranty covers the material and finish while the original purchaser owns the home, and a transferred warranty runs to 50 years from installation. Our metal roof lifespan page goes into more detail.

Aluminum. The roofs we install are heavy-gauge aluminum, and Solid Copper is the other option. The difference matters because aluminum contains no iron, so it does not rust, and it absorbs no water and cannot rot; steel depends on its coating to keep rust away. The manufacturer's ICC-ES evaluation report lists 3105-H24 and 3003-H24 aluminum alloys for the shingle, shake and tile panels, and the aluminum has up to 95% recycled content.

Slate. It is the profile we sell most. Shake and Cedar Shingle are the usual choice when a cedar roof is being replaced and the owner wants to keep the look, Mediterranean Tile suits houses designed around a tile roof, and Standing Seam gives a clean, modern line. We bring samples of every profile to the consultation so you can compare them on your own house.

Nine: Solid Copper, Copper Penny, Hunter Green, Black, Deep Charcoal, Musket Grey, Tile Red, Colonial Brown and Tudor Brown. The finish is the Alunar® coating system, a 70% PVDF coating designed and tested to meet AAMA 2605, backed by a 30 Year Alunar® Coating Warranty, and the colours are rated by the Cool Roof Rating Council (CRRC). We bring samples to your consultation, because colour on a roof reads differently outdoors than on a screen.

From the street it reads as a slate, shake or shingle roof. The Shake profile has deep, hand-split shadow lines, and the Cedar Shingle profile has the flatter look of a sawn cedar roof. The best way to judge is on your own house: we bring samples and colours to the consultation so you can hold them up against your siding and trim.

Yes. Slate, Cedar Shingle, Shake and Mediterranean Tile are all interlocking aluminum profiles. Each piece locks to its neighbours on all four sides with the fasteners concealed, so from the street the roof reads as slate, cedar or tile rather than sheet metal. They are made in Canada by Interlock Roofing and installed in Ontario by our own company, with a fixed price in writing after a free consultation.

Yes. Solid Copper is one of our six profiles, and it is usually used on a bay window, porch or entry rather than a whole house. It is priced differently from the aluminum profiles, so ask for it as a separate line in your quote. The manufacturer's Guardian Lifetime Limited Material Warranty covers every Interlock profile, Solid Copper included.

Yes. Standing Seam is one of our six profiles, alongside Slate, Cedar Shingle, Shake, Mediterranean Tile and Solid Copper, and it needs a minimum 3/12 roof slope like every other profile. Bring photos of the look you want to the consultation, and we will go through the details with you and price it in writing.

Roughly 2 to 3.5 kg per square metre depending on profile, a fraction of the weight of concrete tile. That leaves the structure's capacity for snow load, which matters through an Ontario winter, and replacing concrete tile usually takes weight off the house. We still check the deck and framing at the consultation and put anything that needs attention in the written quote.

3/12. Every Interlock profile needs a minimum 3/12 slope, and the manufacturer's ICC-ES evaluation report lists 3:12 with code-compliant self-adhered underlayment. If part of your roof is flatter than that, such as a porch or a low addition, that section needs a different roofing system, and we will point it out at the consultation so it is dealt with in the written quote.

It has a strong case. The aluminum in Interlock panels has up to 95% recycled content, the panels are made in Canada rather than shipped in from overseas, and a roof that does not need replacing avoids the repeated tear-off waste of shorter-lived roofs. The colours are CRRC-rated, so their solar reflectance and thermal emittance are published.

Class A Fire Rated Available, as a complete assembly. Under ASTM E108 a fire classification belongs to the assembly, not the panel; on our roofs Class A is achieved with two layers of GAF VersaShield® over 12 mm (15/32-inch) plywood. Aluminum itself does not ignite. If you want the Class A assembly, ask for it in your quote, where it is priced as a line item.

No material earns the top rating on its own; the rating belongs to the assembly. FireSmart Canada's guidance is that a Class A fire-rated roof assembly offers the best protection, and it lists metal among the examples, along with clay tile, concrete tile and asphalt shingles. On our roofs, Class A Fire Rated Available, as a complete assembly: two layers of GAF VersaShield® over 12 mm (15/32-inch) plywood, and the aluminum does not ignite.

No roof can promise that, and no roof is fireproof. A Class A assembly and aluminum that does not ignite help, but in a forest fire embers get into gutters, vents and gaps at the roof edge. That is why FireSmart Canada guidance looks at the whole home ignition zone, not just the roof covering. If your home or cottage is near forest, we walk the whole roof edge with you at the consultation, not just the panels.

Gutters, vents and gaps. FireSmart Canada recommends gutters and downspouts made of non-combustible materials such as aluminum, copper or galvanized steel, and non-combustible vents with 3 mm screening or ASTM fire-rated vents. Keep gutters clear of needles and leaves through fire season. We go through the gutters, vents and roof edges with you at the consultation, and we install hidden gutters where the design needs them.

Yes. Interlock's Shake and Cedar Shingle profiles keep the cedar look in aluminum, which does not ignite, and Class A Fire Rated Available, as a complete assembly: two layers of GAF VersaShield® over 12 mm (15/32-inch) plywood, per ASTM E108. Cedar shingles and shakes always come off before the new roof goes on, so the old roof's condition and the deck underneath are checked and priced in your written quote.

For as long as the original purchaser owns the home on which the roof was installed and remains the registered owner under the warranty. Coverage runs from the date of original installation. It is a limited warranty on the material and its factory finish; it does not cover installation workmanship, which is covered separately by our labour warranty.

Ten years from the Substantial Completion Date on your certificate. It is issued by Interlock Metal Roofing (Ontario) Ltd., covers the workmanship of the installation, and stays in effect while a purchaser named on the certificate is the registered owner of, and lives at, the property. It takes effect once the contract is paid in full, and it is not transferable.

The Guardian material warranty transfers once, to the first subsequent registered owner, who receives coverage to 50 years from the original installation date. The transfer needs notice to the manufacturer with proof of purchase within 60 days of the change of ownership and a $300 transfer fee. Our 10 Year Limited Labour Warranty is not transferable.

It depends on where the water gets in. If the problem is in how the roof was installed, such as flashings, trim or a detail, it is a labour warranty matter for us. If it is a defect in the panels or their finish, it is a Guardian matter for the manufacturer. If you are not sure, call us first at 1-866-588-7663 and we will tell you which applies.

For workmanship, contact us at onservice@interlockroofing.com or 1-866-588-7663 no later than 10 days after you find the issue, with your name, address, phone number, certificate number and a description. For the material, write to guardian@interlockroofing.com within 30 days of the issue becoming known, with your registration number, installation date, photos and contact details. If an inspection finds a home-maintenance issue rather than workmanship, a minimum $250 inspection fee may apply.

Yes, within 60 days of installation, using the registration form we supply. If you need another copy of the form, request one from policies@interlockgroup.com. Registration matters because a claim asks for your registration number, and a transfer to a new owner later works from the registered record.

Read the exclusions before you sign. The material warranty excludes installation workmanship, severe weather and Acts of God, hail larger than 38 mm (1.5 in), condensation, ice damming, normal wear including minor scratches and dents, and alterations, foot traffic or equipment added after installation. The labour warranty excludes, among others, fire, lightning, wind storms, hail, impact of foreign objects, ice damming, snow and ice shedding, inadequate venting or insulation, pressure washing, and items such as solar added to the roof.

Yes, and we would rather you did. The Guardian warranty summary and the full 10 Year Limited Labour Warranty text are on our warranty pages, the Ontario labour certificate is available as a PDF, and a free copy of the complete Guardian warranty is available from policies@interlockgroup.com. We also hand you the warranty documents with your quote.

Because a per-square-foot number would be wrong for most houses. Two homes on the same street can differ a lot in roof area, pitch and what is underneath the old roof, and those differences move the price more than the panels do. One consultation gets you a fixed price in writing for your house, and that is the number we stand behind. If you are comparing quotes, compare the system, the fasteners, the warranty terms and the contractor's coverage first, then the price.

An Interlock® roof is priced for your house, not from a price list: roof area, pitch, complexity, what has to come off, the profile and any options set the number. We measure the roof, look at the deck and framing where we can, go through profiles and colours with you, and give you a fixed price in writing. The consultation and the written price are free, with no obligation. Book one through the quote form or call our Mississauga office.

Yes, the estimate is free, and there is no obligation. Consultations are by appointment, and most can be done on Zoom, with a visit to measure the roof and look at the deck. We go through profiles and colours with you using real samples and leave you with a fixed price in writing; our scheduling team confirms the install timing. What you do with it after that is up to you.

No. The price in writing is the price. If we find something that needs attention, such as soft decking or framing that needs work, it goes into that written quote before you sign, not into a change order afterwards. That is why we look at the deck and framing where we can before we price the roof.

For an owner who wants to stop re-roofing, usually yes, though it costs more up front than an asphalt re-roof. We install one roofing system and don't install asphalt, so if you're comparing us with asphalt you're comparing a roof you'll replace again with one that shouldn't need it. Interlock panels lock on all four sides with concealed fasteners, aluminum absorbs no water and cannot rot, and the Guardian Lifetime Limited Material Warranty covers the material and finish while the original purchaser owns the home. The trade-offs are the higher upfront price and the need for a trained installer.

Only through promotions, and offers change. When a promotion includes payment terms, it is shown on our home page with its full conditions and expiry date, and the terms you qualify for are written into your quote. We don't offer standing financing, so check the current offer on the home page or ask at your free consultation.

From us. Interlock Metal Roofing (Ontario) Ltd. is the certified Interlock® roofing contractor for Ontario, and we sell and install the system as a complete roof, so the manufacturer's material warranty and our labour warranty come with it. Book a free consultation through the quote form or call our Mississauga office for a fixed price in writing.

It sheds it. Snow and ice can build up and release unexpectedly, so keep the release area under the eaves clear of people, cars and property through the winter. Snow guards over entries, decks and walkways restrict how much releases at once, and we price them as a line item. Ask where the snow will slide and where the guards go before the roof is ordered, not after the first slide. The panels weigh roughly 2 to 3.5 kg per square metre, which leaves the structure's capacity for snow load.

Yes. Snow guards over entries, decks and walkways are priced as a line item in your written quote, and we plan their placement with you at the consultation. If you want guards added, removed or moved after the roof is finished, call us to arrange it; that is a service call with charges, not a workmanship warranty item. Guards restrict how much snow releases at once, but they can also let snow build up on the roof.

We won't promise that, and neither warranty does: ice damming is excluded from both the manufacturer's material warranty and our labour warranty. Ice dams come from heat loss. Warm air from the house melts snow on the upper roof, and the water refreezes at the colder eaves, so the fix lies in attic insulation, air sealing and ventilation. We look at those with you at the consultation; inadequate venting or insulation is also outside the labour warranty.

Well, because aluminum absorbs no water, so there is nothing in the panel for meltwater to soak into, freeze and expand. Ontario roofs go through that cycle again and again in late fall and early spring. Interlock panels also lock to each other on all four sides with the fasteners concealed, so there are no exposed screw heads for water and ice to work at. Flashings, valleys and gutters still have to drain, and we check those details at the consultation.

Yes, with planning. Communities downwind of Georgian Bay, Lake Huron and Lake Ontario can get heavy, repeated lake-effect snowfalls, so the roof has to shed snow safely and the structure has to carry what stays. Aluminum panels are light, which leaves capacity for snow load, and snow guards over entries, decks and walkways control how much slides at once. Tell us where you park, walk and store things under the eaves, and we plan guard placement around that.

One that sheds snow, absorbs no water and has nothing exposed for wind or ice to work at. That is the case for interlocking aluminum: it has no water to freeze inside it, contains no iron to rust, is light enough to leave capacity for snow load, locks on all four sides with concealed fasteners, and its wind resistance is warranted to 193 km/h (120 mph) when installed to manufacturer specification. Pair it with good attic insulation and ventilation, because no roofing material prevents ice dams on its own.

Wind resistance is warranted to 193 km/h (120 mph) when installed to manufacturer specification, under the manufacturer's Guardian Lifetime Limited Material Warranty. The panels lock to each other on all four sides with the fasteners concealed, which leaves no loose edge for a summer thunderstorm or a winter windstorm to get under. Damage from severe weather and Acts of God is excluded, so read the exclusions before you buy.

Interlock's aluminum panels carry a UL 2218 Class 4 impact rating, the highest class in that standard, tested and listed by Intertek (SPEC ID 33876, listed under Delta Building Products, the manufacturing operation in Delta, BC). The listing covers the Diamond, Shingle and Slate, Shake and Tile panel families. The manufacturer's material warranty excludes hail larger than 38 mm (1.5 in), and hail damage is a matter for your home insurance.

Not on a house. The manufacturer's guidance is that on a home with solid decking, underlayment, an attic and insulation, rain noise is comparable to asphalt shingles. The noisy-roof reputation comes from open-framed barns and sheds, where rain hits a bare sheet with nothing under it. Our installs go over a solid deck.

No. Rust is corrosion of iron and steel, and aluminum contains no iron, so there is no rust to start at a scratch, a cut edge or a fastener hole. That is one reason Interlock roofs are aluminum rather than steel. The finish is the Alunar® coating system, backed by a 30 Year Alunar® Coating Warranty, and the Guardian Lifetime Limited Material Warranty covers the material. Rinse dirt off from the ground now and then, as you would on any roof.

The finish helps. Alunar® colours are rated by the Cool Roof Rating Council, so their solar reflectance and thermal emittance are published, and lighter colours reflect more of the sun. How much that changes your cooling through a hot, humid Ontario summer depends on your insulation, ventilation and the house itself, so we don't put a savings number on it. Ask to compare the CRRC values of the colours you like.

No. Lightning follows height, shape and isolation, not roof material, so it strikes the tallest point around: a tree, a pole, a chimney, a hilltop. The manufacturer cites the Metal Construction Association's technical guidance that a one-storey home with a metal roof is no more likely to be struck than the same home with asphalt. Lightning damage itself is excluded from the labour warranty and is a home insurance matter.

Any roof can, and it is often mistaken for a leak. Condensation is caused by high humidity and a lack of ventilation, and Ontario's humid summers and cold winters test both. Keep the attic and other roof cavities well ventilated and the eaves free of blockage; if condensation persists, have a builder check ventilation, insulation and the vapour barrier. Condensation is excluded from the manufacturer's material warranty, and inadequate venting or insulation is excluded from the labour warranty.

There is no fixed figure, because timing depends on the stock of the profile and colour you choose, crew availability, building permit approval where one is needed, and the size and complexity of the roof. Our scheduling team confirms the timing for your project. Hips, valleys, dormers, skylights and chimneys each add flashing and time, and remote cottage sites add logistics.

Only over a single layer of asphalt shingles, and only after inspection. Cedar shingles and shakes, concrete tile and natural slate always come off. With one layer of asphalt, we inspect first to see whether a roof-over is suitable, because problems such as rot can be hiding underneath, and they have to be dealt with before the new roof goes on. Whatever the inspection finds is written into your quote.

It depends on your municipality and the scope of work. Under Ontario's Building Code Act, 1992, building permits are issued by your municipality's chief building official, so the local building department decides what your project needs. Structural work, such as replacing rafters or sheathing, can change what is required. We confirm the requirements for your address before you sign.

Yes. Muskoka, Gravenhurst, Huntsville, Kawartha Lakes and Peterborough are all in the areas we serve. Cottage sites with long driveways, steep lots or water access change the logistics, and we plan them at the consultation so they are reflected in your written price and install timing. If the cottage is near forest, ask about the Class A Fire Rated Available assembly and non-combustible gutters while the roof is planned.

Talk to us before anything is mounted. Damage from equipment added to the roof after installation is excluded from the manufacturer's material warranty, and the installation of solar, antennas or other items on the roof is excluded from our labour warranty. Work on the roof by anyone other than us or our authorized representatives may also void the labour warranty, so bring us into the racking plan first.

Yes, skylights and chimneys are flashed as part of the roof, and each adds time that is reflected in the price. For gutters, we install hidden gutters where the design needs them; standard aluminum gutters are coordinated with a third-party gutter specialist. If your home or cottage is near forest, ask about non-combustible gutters and screened vents while the roof work is planned.

Very little, but not none. Have the gutters cleaned regularly and have branches and other debris removed from the roof promptly. Rinse dirt or mildew from the ground with a hose and a well-diluted non-abrasive detergent. Keep attic ventilation working and the eaves clear. Unlike cedar, there is no re-treating, and unlike asphalt, there is no granule loss to watch for.

It is best avoided, for your safety and for the finish. Do what you can from the ground with long-handled tools, and hire a skilled professional for anything that needs roof access. Foot traffic after installation is excluded from the manufacturer's material warranty, and work by anyone other than us or our representatives may void the labour warranty, so call us first.

No. The use of high-pressure washing systems is excluded from our labour warranty. Clean the roof from the ground by lightly hosing it down with a well-diluted non-abrasive liquid detergent and a long-poled soft-bristle brush, and remove debris with a long rope or pole. How fast dirt and mildew build up depends on slope, shade, trees and sun exposure.

Call our service line at 1-866-588-7663 or email onservice@interlockroofing.com. We can look at the damage and arrange the repair. Damage from wind storms, falling objects and other Acts of God is excluded from both warranties, so it is usually a home insurance claim; photograph the damage before anything is moved.

No repainting is part of normal ownership. The factory finish is the Alunar® coating system, a 70% PVDF coating designed and tested to meet AAMA 2605, and it carries a 30 Year Alunar® Coating Warranty. Keep the finish in good shape by cleaning from the ground with a hose and a mild detergent, never a pressure washer, and by keeping foot traffic off the roof.

Yes, and the board usually leads it, because roofs are generally part of the common elements the condominium corporation controls; your declaration sets out exactly what is common. We can meet the board or the property manager, walk the roofs, and give a fixed price in writing, along with the product documents, colour samples and warranty terms the board and owners will ask for. One profile and one colour can run across every building in a townhouse complex.

It can, under section 97 of Ontario's Condominium Act, 1998. Repairing or replacing with materials reasonably close in quality to the original, as appropriate under current construction standards, is not treated as an alteration. A change beyond that is an addition, alteration or improvement to the common elements: it usually needs notice to owners, who can requisition a meeting, and a substantial change, as defined in section 97(6), needs a vote in favour by owners of at least 66⅔ per cent of the units. Get legal advice before deciding.

Only with the corporation's approval, where the roof is part of the common elements. Under section 98 of the Condominium Act, 1998, an owner can change the common elements only after the board approves it by resolution and the owner and the corporation sign an agreement covering cost, repair, maintenance and insurance, with notice to owners where section 97 would apply. Get the approval in writing before you sign anything; we can supply the specification sheets and warranty terms the board needs.

The manufacturer's Guardian warranty terms are the same for each building, but the board should read the full terms before it decides, because the ownership and transfer rules matter in a condominium. Our labour warranty covers the purchaser named on the certificate while that purchaser is the registered owner of, and lives at, the property. We give the board both documents in full with the quote.

ICC-ES evaluation report ESR-1790, held by the manufacturer, Interlock Roofing. It evaluates fire classification, wind-uplift resistance and weather resistance for the Shingle, Diamond, Shake and Hidden Fastener Tile panels under the International Building Code and International Residential Code. In Ontario, acceptance rests with the municipality's chief building official under the Ontario Building Code, so share the report early, and check the current version on the ICC-ES website.

Per the manufacturer's ICC-ES report, the aluminum shingle and diamond panels are 3105-H24 alloy at 0.48 mm (0.019 in) base metal, and the shake and tile panels are 3003-H24 or 3105-H24 at 0.70 mm (0.0276 in). The finish is the Alunar® coating system, a 70% PVDF coating designed and tested to meet AAMA 2605, with CRRC-rated colours. Installed weight is roughly 2 to 3.5 kg per square metre depending on profile.

Class A Fire Rated Available, as a complete assembly: Interlock aluminum over two layers of GAF VersaShield® fire-resistant underlayment on 12 mm (15/32-inch) plywood, classified under ASTM E108 per ICC-ES ESR-2053. In Canada the matching standard is CAN/ULC-S107. Specify the assembly, not the panel, because the classification belongs to the whole build-up, and ask us for it as a priced line in the quote.

The manufacturer's ICC-ES report ESR-1790 lists maximum allowable uplift loads that depend on the fastening system: up to 8.50 kPa (177.5 psf) for the shingle and diamond panels, 6.82 kPa (142.5 psf) for the hidden fastener tile panels and 5.51 kPa (115.0 psf) for the shake panels. Check the current report before you specify. The Guardian warranty warrants wind resistance to 193 km/h (120 mph) when installed to manufacturer specification.

Email scott@interlockmetalroofing.ca or call our Mississauga office. The manufacturer publishes its test reports and certifications at interlockroofing.com, including the ICC-ES report. We can bring samples and colours to a design meeting, in person or on Zoom, and price the roof in writing once the drawings are far enough along.

Yes, we take subcontract work from builders and general contractors. Talk to us early in the design: slope (minimum 3/12 for every profile), the Class A Fire Rated Available assembly if the site needs it, snow guard locations and the deck are much easier to settle before framing than after. Email scott@interlockmetalroofing.ca or call our Mississauga office to discuss the project, and our scheduling team will confirm timing.

A solid deck. For the Class A Fire Rated Available assembly, the deck is 12 mm (15/32-inch) plywood under two layers of GAF VersaShield®. The manufacturer's ICC-ES report sets a minimum 3:12 slope with code-compliant self-adhered underlayment. Confirm the deck and underlayment with us before framing so the roof goes on as specified.

Yes. Ask us for a WSIB clearance certificate and our liability insurance certificate. You can also look up our clearance yourself through the WSIB's online clearance service, and the WSIB states that a principal holding a valid clearance will not be held liable for premiums the contractor owes for the clearance's validity period. Ask for the insurance certificate to come directly from the broker or insurer with the policy dates on it.

Start with coverage, because Ontario has no compulsory provincial licence for roofers. Verify WSIB coverage with a clearance certificate you look up yourself, liability insurance from the insurer, the legal name in the Ontario Business Registry, any municipal licence, and the written warranty terms, including who issues each warranty and what it excludes. Our legal name is Interlock Metal Roofing (Ontario) Ltd., 2800 Argentia Rd #5, Mississauga, ON L5N 8L2.

We review bids when they are submitted to us, but we don't actively pursue public tenders. If you have a public-sector or institutional project, send the scope, location, schedule and submission requirements to scott@interlockmetalroofing.ca. For a submission we can provide company documents, the manufacturer's published test and evaluation reports, the warranty documents, and our WSIB clearance certificate and liability insurance certificate on request.

Yes, it is made in Canada. The panels are manufactured by Interlock Roofing in Delta, BC, and installed in Ontario by Interlock Metal Roofing (Ontario) Ltd. The aluminum has up to 95% recycled content, and the Alunar® colours are CRRC-rated, with published solar reflectance and thermal emittance values.

Book the free consultation for a time you can both be there, at the house or on Zoom. We measure the roof, bring samples, answer questions and leave a fixed price in writing, with no obligation. Before anyone signs, check the contractor the same way you would for yourself: an Ontario street address, the legal name in the Ontario Business Registry, WSIB coverage and a warranty you can read in full.

They change. Our labour warranty stays in effect while a purchaser named on the certificate is the registered owner of, and lives at, the property; if more than one purchaser is named, one of them must still own and live there. It is not transferable. The Guardian material warranty runs while the original purchaser owns the home and transfers once to the next registered owner, to 50 years from installation, with notice and proof of purchase within 60 days and a $300 fee.

A 10-day cooling-off period, among others. Ontario's consumer guidance says a home renovation or repair contract of $50 or more signed in your home can be cancelled within 10 calendar days without fees, though reasonable compensation may be owed for work already started. Contracts over $50 must be in writing, and the final price cannot be more than 10% over the estimate unless new work or a new price was agreed. Ontario also recommends keeping deposits to a minimum.

Not much, and none of it needs a ladder if you plan for it. There is no re-treating as with cedar. Gutters need regular cleaning and debris should be removed promptly, ideally by a professional rather than a family member on a ladder. Dirt can be rinsed from the ground with a hose and a long-poled soft brush. Put snow guards over the entry and walkways, because snow slides off a metal roof.

Check who you are dealing with before anyone books work. Look for an Ontario street address you can find on a map, a legal name you can find in the Ontario Business Registry, WSIB coverage, no listing on Ontario's Consumer Beware List, and finished jobs in nearby towns. Make sure the quote, contract and warranty all name the same company, the one that installs the roof, and read the exclusions before signing.

That is up to your insurer, so ask them before you assume a discount. What we can give you is the documentation they may ask for: the UL 2218 Class 4 impact listing by Intertek for the aluminum panels, the Class A Fire Rated Available assembly details if you choose it, and the manufacturer's warranty documents. Some insurers weigh impact resistance; others do not.

We can't promise a number, and nobody honestly can. What a buyer gets is concrete: the manufacturer's Guardian material warranty transfers once, giving the next registered owner coverage to 50 years from installation, if notice and proof of purchase reach the manufacturer within 60 days of the sale with the $300 transfer fee. Keep your registration and contract with the house papers.

Not for the roofing itself, as far as current programs show. The Home Renovation Savings Program, run by Enbridge Gas and Save on Energy with support from the Ontario government, lists upgrades such as insulation, windows and doors, heat pumps, smart thermostats and solar panels with battery storage; roofing is not on the list. If you are adding attic insulation while the roof is replaced, check that program's requirements separately. Program rules change, so check before you rely on one.

Generally that is your home insurance, not the roof warranties. The labour warranty excludes hail, wind storms, hurricane-force winds and impact of foreign objects, and the manufacturer's material warranty excludes severe weather, Acts of God and hail larger than 38 mm (1.5 in). Check your policy, photograph damage before anything is moved, and call us at 1-866-588-7663 to assess the repair.