Metal Roofing &
Fencing Insights.
Practical guides for Ontario homeowners on standing seam roofing, metal fencing, weather protection, and premium exterior upgrades.
153 articles in Metal Roofing — page 1 of 7
Can You Install a Metal Roof Over Existing Shingles?
Metal can go over shingles in some situations and shouldn't in others. Here's what actually decides it — the deck, the number of existing layers, ventilation, and your local building department.
Roofing Underlayment Compared: Synthetic vs Felt vs Self-Adhered
Underlayment is the layer you never see and can never replace without taking the roof off. Here is how felt, synthetic and self-adhered membranes actually behave under a metal roof.
Attic Ventilation for Metal Roofs: Intake and Exhaust as One System
A metal panel is airtight by design, so every moisture and temperature problem a roof has gets solved underneath it. Here is how intake and exhaust work together, and how attics fail.
Diagnosing a Roof Leak: Tracing Water Back to the Entry Point
The wet spot on your ceiling is almost never directly below the hole. Here is how water actually travels through a roof assembly, and how to narrow down where it is getting in.
K-Style vs Half-Round Eavestrough: Profile, Capacity and Appearance
The two profiles that cover almost every Ontario home. How each one is shaped, how much water it moves, how it hangs, and which one suits your roofline and your tree cover.
Freeze-Thaw Cycling: What It Actually Does to Roofing Materials
Freeze-thaw damage is not really about cold. It is about water getting inside a material and expanding as it freezes — which is why some materials come apart and others simply do not care.
PVDF (Kynar 500 / Hylar 5000) vs SMP: The Resin Difference
Two paint systems cover most of the pre-finished metal sold in Ontario. They look identical on a sample chip. The difference is the resin holding the pigment, and it shows up years later.
Low-Slope Commercial Metal Roofing: What Works Below 3:12
Below roughly 3:12 a metal roof stops shedding water and starts holding it. Here is what changes — mechanically seamed panels, in-seam sealant, and why end laps decide the outcome.
Snap-Lock vs Mechanically Seamed Standing Seam: How Each One Engages
Both systems hide their fasteners and both are called standing seam, but they close the seam in completely different ways. Here is how each works and where each belongs.
Galvalume vs Galvanized Steel: Coating Chemistry and Where Each One Fails
Both coatings protect steel, but they do it by different mechanisms — and they fail in opposite environments. Here is the chemistry, and how to pick the right substrate for an Ontario roof.
Tear-Off vs Overlay: How to Decide on Your Roof
Both approaches are legitimate. The right one depends on what you know about your deck, how long you plan to stay, and how much uncertainty you're willing to build over.
High-Temperature Underlayment: Why Metal Roofs Need It
A dark metal panel in July gets far hotter than a shingle roof. Standard peel-and-stick softens, bleeds and grabs the panel. Here is what high-temp membranes do differently.
Why Intake and Exhaust Must Be Balanced — and What Happens When They Are Not
An attic with more exhaust than intake does not simply underperform. It goes negative, and the make-up air comes from the heated house below — pulling moisture up with it all winter.
Rust Spots on a Metal Roof: What Cut Edges and Scratches Actually Mean
Not all rust on a steel roof means the same thing. Edge rust, scratch rust, fastener rust and orange speckling from cutting debris have different causes, different urgency and different fixes.
Sizing Eavestrough: 5-Inch vs 6-Inch and What Actually Drives the Choice
Eavestrough size is not a style preference. Roof area, pitch, valley placement, downspout count and rainfall intensity all feed the decision — and metal roofs change the maths.
Lake-Effect Snow: Why the Snow Belt Is a Different Roofing Problem
Lake-effect snow forms when cold air crosses open, relatively warm water. It explains why one part of Southern Ontario buries and another gets flurries — and why roofs are built differently there.
Chalking and Fading in Coil Coatings: How They Are Measured
Every painted roof chalks and shifts colour eventually. The useful questions are how much, how fast, and how the industry measures it — because warranty language depends on those numbers.
Retrofit Framing: Converting a Flat Commercial Roof to Sloped Metal
A retrofit framing system builds slope over an existing flat roof so a metal panel can be installed without a tear-off. How it works, what has to be engineered, and where the complications are.
Mechanical Seam Roofing: 90 Degree Single Lock vs 180 Degree Double Lock
A single lock folds the seam once. A double lock folds it again and wraps it over. The second fold changes minimum slope, sealant behaviour and how the roof handles wind-driven water.
Steel Gauge Explained: 24, 26 and 29 Gauge Metal Roofing
Gauge runs backwards — the bigger the number, the thinner the steel. Here is what 24, 26 and 29 gauge actually measure, how much stiffness you gain, and where each one belongs.
A Homeowner's Metal Roof Inspection Checklist
You can learn most of what you need to know about your metal roof from the ground, a ladder at the eave, and the attic. Here's exactly what to look at, twice a year.
Ice and Water Shield: Where It Goes and How Far Up the Roof
Ice barrier membrane is the last line of defence against an ice dam. Getting the coverage right means understanding what you are measuring from — and it is not the eave.
Ridge Vent vs Box Vents vs Turbines vs Powered Fans
Four ways to exhaust an attic, and they are not interchangeable. How each one moves air, how each behaves under a metal roof, and why powered fans are a poor fit for a cold climate.
Fasteners Backing Out on an Exposed-Fastener Metal Roof
Screws standing proud of the panel are the most common maintenance issue on exposed-fastener roofing. Here is why it happens, why tightening them is usually the wrong move, and how it is properly fixed.