Metal Roofing in Markham, Ontario — Lifetime Interlock® Aluminum Shingles Installed Locally

Aluminum panels shed snow and ice far more effectively than asphalt because their smooth, hard surface prevents ice adhesion and provides no friction grip for snow accumulation. Markham receives about 117 cm of snow per year across roughly 86 freeze-thaw days, which repeatedly weakens asphalt shingles through expansion and contraction. Interlock's four-way interlocking design keeps water from penetrating seams even under snow melt cycles. Optional snow guards can be installed if you want to control roof runoff, but the metal itself resists ice-dam formation that plagues traditional roofing in freeze-thaw climates.

No. Aluminum actually thrives in freeze-thaw climates because it expands and contracts uniformly without cracking or splitting—properties that asphalt shingles and wood cannot match. Markham experiences approximately 86 freeze-thaw days annually, plus 780 mm of rain and about 117 cm of snow, creating ideal conditions for shingle failure. Aluminum's oxide layer self-heals when scratched, so seasonal stress does not compromise the material. The ICC-ES evaluation report ESR-1790 confirms suitability for IBC/IRC standards nationwide, including regions with severe moisture and temperature swings.

Yes, reliably. Markham's typical wind gusts reach 113 km/h, and Interlock panels are warranted to resist winds up to 120 mph (193 km/h) when installed to specification. The four-way interlocking design distributes lateral forces across adjacent panels, preventing the edge-lifting and blow-off common to asphalt shingles in strong gusts. Each panel locks on all four sides, creating a unified system rather than 3,000 independent shingles vulnerable to wind. This structural redundancy is why Interlock carries a wind warranty that asphalt cannot match.

Aluminum cannot rust because it contains no iron; iron is the element that oxidizes and corrodes in wet conditions. Instead, aluminum develops a thin, self-healing oxide layer that protects the underlying metal from moisture and salt air. Markham's climate delivers 780 mm of rain annually, creating persistent moisture that would accelerate rust on steel. Interlock uses roofing-grade 3105-H24 / 3003-H24 aluminum (ASTM B209) with a dual-sided Alunar 70% PVDF fluorocarbon coating warranted 30 years against chalking and fading, adding a second barrier that steel roofing cannot offer.

Yes. Interlock's Mediterranean Tile profile installs at approximately 0.59 lb/sq ft—about 96% lighter than concrete or clay tile—so no structural reinforcement is required. Most homes can accommodate the weight over an existing roof, eliminating the cost and disruption of tear-off and structural work. This matters in Markham, where carrying 117 cm of snow plus 780 mm of annual rainfall creates meaningful structural load. Because the aluminum tile weighs less than 1 pound per square foot, you gain authentic aesthetic appeal without engineering modifications or contractor delays.

Interlock panels achieve UL 2218 Class 4 impact rating—the highest available—and the warranty covers perforation from hailstones up to 1.5 inches. This non-combustible, impact-resistant construction often qualifies homeowners for insurance premium discounts with carriers that recognize Class 4 ratings and metal roofing durability. Markham's climate includes periodic severe weather, and a roof that survives hail without requiring replacement or claims activity is attractive to insurers. Contact your carrier to verify eligibility for discounts when you upgrade; many offer 5–15% reductions for Class 4 metal roofing.

Aluminum metal roofing requires far less maintenance than asphalt, wood, or clay tile. Asphalt shingles degrade continuously under Markham's 3,017 annual sunshine hours and freeze-thaw stress, requiring gutter cleaning and periodic sealing. Metal roofing is CALGreen-verified for reduced maintenance: gutters only need seasonal clearing, and the hard surface sheds debris without absorbing moisture or supporting algae growth. No caulking, no recoating, no wood rot risk—aluminum simply weathers in place. The 30-year coating warranty against chalking and fading means your roof maintains appearance and protective value without intervention.

How much does metal roofing cost, and how does it compare to asphalt over 50 years?

Yes. energy-efficient Interlock colors achieve initial solar reflectance up to 0.55 and thermal emissivity of 0.84, reflecting the heat that asphalt shingles absorb and radiate into the home. Markham's 3,017 annual sunshine hours means significant cooling load during warm months; a reflective roof measurably reduces AC runtime. Cool Roof Rating Council certification confirms measured reflectance at installation and after aging. The difference compounds over decades: while energy savings vary by home orientation and insulation, reflective metal roofs consistently outperform dark asphalt in solar heat gain, offsetting a portion of the premium through lower utility bills.

Yes. Interlock Metal Roofing (Ontario) Ltd. has served the region since 1998, bringing 25+ years of local expertise to Markham and surrounding areas. The company manufactures panels in Delta, BC, and draws on proven installation experience from coastal salt-air homes to Antarctic research stations, ensuring knowledge of how aluminum performs under diverse conditions. Local service means faster response times, familiarity with Markham's building codes and climate stress patterns, and accountability within the community. Pair this with the current promotion—interest-free payments for 3 months and savings of at least $2,499—and you benefit from established local reputation and simplified financing.