The Interlock Blog
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Showing 13–24 of 29 articles
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The Effects of Snow on Your Roof
Snow damages roofs by weight, not depth — and a foot of wet snow can outweigh several feet of powder. An Interlock aluminum roof adds almost no load of its own (~0.41 psf) and its smooth, four-way-interlocked surface sheds snow; one owner reported a 95% drop in roof snow load after switching.
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15 Most Popular Roof Types and Their Characteristics
Roof type refers to the shape of the roof — gable, hip, gambrel, mansard, flat, and a dozen more — and each has its own strengths in cost, weather resistance, attic space, and solar suitability. Whatever shape your home has, an Interlock metal roof can be formed to fit it.
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Quality Roof Materials
A roof is only as good as its weakest component. Interlock builds the whole system to last — aircraft-grade aluminum panels, stainless-steel fasteners, and cast-metal snow guards — so nothing rusts out before the roof does. It’s the quality a retired engineer noticed, and the reason the Empire State Building switched its windows to aluminum.
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Explore Diverse Metal Roof Styles for Your Home
Metal roofing comes in three materials (aluminum, steel, copper) and many looks — slate, shake, shingle, tile, and standing seam. Aluminum lasts 30–70+ years and won’t rust, copper can last 100+, and Interlock pairs any of these styles with a four-way interlock, UL 2218 Class 4 impact rating, and a lifetime warranty.
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Minimum Roof Pitch for a Metal Roof
The minimum pitch for all Interlock Metal Roofing Systems is 3:12 — meaning the roof rises 3 inches for every 12 inches of horizontal run. Adequate slope lets water run off quickly and prevents pooling and leaks; for roofs shallower than 3:12, a membrane roofing system is recommended instead.
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Skylights for Metal Roofs
Yes — you can add skylights to a metal roof. Curb-mounted skylights are compatible with all Interlock Lifetime Metal Roofing Systems, integrating with the panels and flashing to stay watertight. They bring in natural light, can help with heating and ventilation, boost mood, and add value when installed properly.
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Historic Metal Roofing Excellence: Interlock Metal Slate on the Samuel Gilbert House in Gloucester, MA
The 1750 Samuel Gilbert House in Gloucester, MA — a 275-year-old colonial landmark — was preserved with a Black Interlock Metal Slate roof in 2012. It delivers the authentic look of natural slate without the crushing weight, won’t crack or split, withstands New England’s coastal weather, and carries a 50-year transferable warranty.
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Can You Walk on a Metal Roof?
You can walk on a metal roof, but you usually shouldn’t. It’s slippery, you can dent panels or void coverage if you step wrong, and falls are the real danger. If walking is unavoidable, use fall protection and slip-resistant footwear and step in the right places — but for inspections and repairs, it’s safest to call a professional.
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Interlock Metal Roofing Systems Are Strong
Interlock roofs are made from aircraft-grade aluminum — pound-for-pound stronger than steel, about one-third the weight, and rust-proof. Formed into a four-way interlocking panel and finished in Alunar® coating, the system is light enough to install over an existing roof yet rated UL 2218 Class 4 for impact.
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Problems With Your Asphalt Shingles?
Asphalt shingles curl, crack, and blow off; lose the protective granules that shield them from UV; and grow moss, algae, and black streaks. Each problem shortens an already short (15–20 year) lifespan. A rust-proof aluminum roof eliminates all of them — no granules to lose, nothing to rot, and a 50+ year life.
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Why an Aluminum Shingle Roof Is the Best Choice for Homeowners Living Near the Ocean
Salt air destroys ordinary roofs. Interlock’s aircraft-grade aluminum shingles can’t rust, are sealed in a marine-tough PVDF Alunar® coating, carry UL 2218 Class 4 impact resistance, and are Florida Building Code approved for High-Velocity Hurricane Zones — making them the best choice for coastal homes.
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An Interlock® Roof Is a Great Investment
A metal roof costs more upfront, but as an asset it pays back: one lifetime install instead of three asphalt re-roofs, up to 25% cooling savings, possible insurance discounts from its Class A fire and Class 4 impact ratings, higher resale value, and a transferable lifetime warranty.
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