A Full Guide to Metal Roof Installation in Ontario

Metal roofing is becoming increasingly popular in Ontario due to its durability, energy efficiency, and aesthetic appeal. Whether you’re a homeowner or a contractor, understanding the intricacies of metal roof installation is crucial. This comprehensive guide covers everything from installation requirements to common mistakes, specifically tailored for the Ontario region.

1) Installation Requirements For New Metal Roofs

Installing a new metal roof in Ontario involves a series of detailed and specific requirements that must be adhered to, ensuring both the longevity of the roof and the safety of the structure. Ontario’s diverse climate, ranging from harsh winters to humid summers, demands a roofing solution that can withstand various weather conditions while maintaining its integrity and appearance. Here’s a detailed look at what’s involved in the installation process for new metal roofs in this region.

Regional Considerations

1. Climate Adaptability: Ontario experiences heavy snowfall, strong winds, and occasional hail. Metal roofs being installed in the region must be capable of handling these extreme weather conditions. This involves selecting materials and designs that can withstand heavy snow loads and resist wind uplift.
2. Building Codes and Standards: Ontario’s building codes dictate specific standards for roofing materials and installation methods. These codes ensure that the roofing system is safe, durable, and energy-efficient. Compliance with these codes is not just a legal requirement but also a guarantee of quality.

Material Selection

1. Types of Metal: Common materials used in Ontario include galvanized steel, aluminum, and, less frequently, copper or zinc. Each material offers different benefits in terms of weight, durability, and aesthetic appeal. For instance, galvanized steel is popular for its balance of cost-effectiveness and durability, making it suitable for most residential applications in Ontario.
2. Quality and Specifications: The quality of the metal, indicated by its gauge (thickness), coating quality, and paint finish, is crucial. In Ontario, a thicker gauge metal might be preferred for additional strength against snow and wind.

Cost Factors

1. Price Range: The cost of installing a new metal roof in Ontario can vary widely, typically ranging from $5 to $12 per square foot. This price can fluctuate based on the type of metal used, the complexity of the roof design, and the installation labor costs.
2. Long-Term Savings: While the initial cost is higher than traditional roofing materials, metal roofs offer long-term savings through reduced maintenance costs, energy savings due to their reflective properties, and a lifespan that can exceed 50 years.

Product Parameters and Installation Details

1. Weight Load: Metal roofs are generally lightweight compared to traditional tile or slate roofs. However, it’s essential to ensure that the building’s structure can support the new roof, especially in older homes.
2. Insulation and Ventilation: Proper insulation and ventilation are key to preventing condensation, which can be a concern in Ontario’s humid climate. This involves installing an appropriate underlayment and ensuring adequate airflow in the attic space.
3. Waterproofing and Sealing: Given Ontario’s heavy rainfall and snow, ensuring that the roof is completely waterproof is crucial. This includes the use of sealants and flashing around roof penetrations, edges, and valleys.
4. Snow Retention: In areas with heavy snowfall, snow guards or retention systems may be necessary to prevent snow from sliding off the roof in large, dangerous sheets.
5. Wind Resistance: Metal roofs should be installed with a fastening system designed to resist wind uplift, which can be a concern during Ontario’s severe storms.

2) Tools Required

A successful metal roof installation requires the right tools. Essential tools include:

• Tape measure
• Metal shears or nibbler
• Screw gun
• Hammer
• Chalk line
• Level
• Safety equipment (gloves, glasses, harness)

3) Installation Materials Required

The materials needed for metal roof installation include:

• Metal panels or shingles
• Underlayment
• Fasteners (screws, nails)
• Flashing
• Ridge cap
• Eave trim
• Sealant

4) Project Step-by-Step

Installing a metal roof in Ontario requires precision and attention to detail. Here’s a step-by-step guide to ensure a successful installation, considering the region’s specific needs and challenges.

Step 1: Apply the Underlayment

• Purpose: Underlayment acts as a secondary barrier against water and moisture.
• Process: Roll out the synthetic underlayment over the roof deck, starting from the bottom. Overlap each row as specified by the manufacturer.
• Ontario Consideration: Choose a breathable underlayment to combat Ontario’s humid summers and cold winters.

Step 2: Order Panels to Fit

• Measurement: Accurately measure the roof to determine the size of the panels needed.
• Customization: Order panels cut to the specific lengths required for your roof to minimize waste and ensure a perfect fit.

Step 3: Bend Trim Ends Closed

• Purpose: Bending the trim ends prevents water and pests from entering under the roof.
• Method: Use a hand seamer or metal brake to bend the ends of the trim pieces.

Step 4: Fasten Eave Trim

• Installation: Attach the eave trim along the roof’s edge. This trim directs water away from the fascia and into the gutters.
• Securing: Use appropriate fasteners, spacing them as per manufacturer guidelines.

Step 5: Splice and Overlap Trims

• Technique: Overlap trim pieces by at least an inch to ensure a watertight seal.
• Sealing: Apply sealant between the overlaps for extra protection.

Step 6: Snap a Square Reference Line

• Guidance: A square reference line ensures that the panels are aligned correctly.
• Tool: Use a chalk line to mark a straight, square line across the roof deck.

Step 7: Set the Panels

• Alignment: Place the first panel according to the reference line.
• Attachment: Ensure the panel is flush with the eave and rake edges.

Step 8: Drive Screws Just Right

• Fastening: Use screws with rubber washers, driving them in perpendicular to the roof surface.
• Pressure: Avoid over-tightening, which can strip the washer and compromise the seal.

Step 9: Overlap the Panels

• Overlap: Each panel should overlap the preceding one by the manufacturer’s recommended distance.
• Alignment: Ensure the panels are straight and consistently overlapped.

Step 10: Cover the Rake Edge

• Protection: Rake edge trim protects the roof’s edge and gives a finished look.
• Installation: Fasten the trim over the edge of the panels and underlayment.

Step 11: Secure the Ridge Cap

• Final Step: The ridge cap covers the peak of the roof.
• Sealing: Fasten it securely, ensuring all gaps are sealed to prevent water ingress.

5) Common Metal Roof Installation Mistakes

Common Metal Roof Installation Mistakes in Ontario

Installing a metal roof in Ontario requires precision and expertise. However, even experienced installers can encounter common pitfalls. Being aware of these mistakes is crucial for homeowners and contractors alike to ensure a successful installation. Here’s a detailed look at common metal roof installation mistakes, particularly relevant to the Ontario region.

1. Incorrect Fastener Placement

• Issue: Using the wrong type of fasteners or placing them incorrectly can lead to leaks and reduced lifespan of the roof.
• Ontario Consideration: Given the region’s heavy snow and wind, it’s crucial to use fasteners that are designed for metal roofing and can withstand these conditions.

2. Inadequate Sealing

• Problem: Failing to properly seal joints, edges, and flashings can allow water and moisture to penetrate, leading to leaks.
• Specifics for Ontario: The freeze-thaw cycle in Ontario makes proper sealing even more critical to prevent water ingress and ice damming.

3. Poor Panel Alignment

• Consequence: Misaligned panels not only affect the roof’s appearance but can also compromise its structural integrity.
• Ontario’s Challenge: Incorrect panel alignment can be exacerbated by Ontario’s varying temperatures, leading to expansion and contraction issues.

4. Over-Tightening Screws

• Result: This can strip the screw holes and damage the metal, leading to leaks.
• Consideration: In Ontario’s climate, the correct installation of screws is vital to accommodate temperature-induced expansion and contraction.

5. Ignoring Manufacturer’s Instructions

• Mistake: Each metal roofing system comes with specific installation instructions. Ignoring these can lead to improper installation.
• Ontario’s Context: Adhering to manufacturer guidelines is essential, especially considering the regional weather patterns and building codes.

6. Inadequate Overlap of Panels

• Impact: Insufficient overlap can lead to leaks, particularly in areas with heavy rainfall and snow, common in Ontario.
• Detail: Ensure at least the manufacturer-recommended overlap, typically around 1-2 inches.

7. Incorrect Underlayment Use

• Issue: Using an underlayment that is not suitable for metal roofing or the specific climate can lead to moisture problems.
• Ontario’s Climate: Choose a breathable, waterproof underlayment that can handle Ontario’s humid summers and cold winters.

8. Neglecting Expansion and Contraction

• Problem: Metal expands and contracts with temperature changes. Not allowing for this movement can cause buckling and warping.
• Relevance in Ontario: With a wide range of temperatures throughout the year, accounting for expansion and contraction is crucial.

9. Improper Flashing Installation

• Result: Flashing is essential for waterproofing certain areas of the roof. Incorrect installation can lead to leaks.
• Ontario Factor: Particular attention should be paid to flashing around chimneys, vents, and valleys due to snow accumulation.

10. Not Preparing the Roof Deck

• Consequence: Failure to properly prepare the roof deck can lead to uneven surfaces, affecting the installation of the metal roof.
• Ontario Consideration: Ensure the deck is clean, dry, and free of damage before installation, especially after Ontario’s harsh winters.

6) Should You Hire a Contractor to Install a Metal Roof?

In Ontario, hiring a professional contractor is recommended due to the complexity of the installation and the need for adherence to local building codes.

7) How Long Does It Take to Install a Metal Roof?

The installation time can vary depending on the size and complexity of the roof. On average, it can take anywhere from a few days to a week.

8) Can You Put a Metal Roof Over Shingles?

In Ontario, it’s possible to install a metal roof over existing shingles, provided the structure can support the additional weight and the local building codes allow it.

Conclusion

Installing a metal roof in Ontario is a significant investment that offers long-term benefits. Whether you choose to DIY or hire a professional, understanding the process, requirements, and common pitfalls can ensure a successful installation. With proper installation, a metal roof can enhance the aesthetic, functionality, and value of your property in Ontario.