Roof Covering Materials Part I: Underlayment & Shingles

A leaking roof is every homeowner’s nightmare. The good news is that with proper materials and planning, you can significantly reduce the risk of leaks. In this guide, we’ll explore the role of underlayment and shingles in your roofing system and how to decide when it’s time for a replacement.

The Role of Underlayment

Underlayment is an essential layer beneath your roof covering, providing an additional barrier against moisture. Traditional tar paper was once the standard, but today’s homes benefit from advanced materials that offer greater durability and performance. At Quality Homes & Renovations, we use two primary underlayment products for optimal protection.

Ice & Water Barrier

Installed along the eaves and in roof valleys, the ice & water barrier is a self-adhering waterproof membrane. When applied to the plywood, it seals nail penetrations, preventing water infiltration caused by ice dams or backed-up water. While the Ontario Building Code mandates its use at eaves, we go a step further by applying it in valleys for added protection. Think of it as affordable insurance for your roof.

Synthetic Roofing Underlayment

Covering the rest of the roof, synthetic underlayment is a modern upgrade from traditional tar paper. It’s lighter, more durable, and resistant to tearing. Installed with staples or cap nails, it provides temporary waterproofing while the roof covering itself is being installed. If your roof covering is damaged, the overlapping rows may be enough to protect your home until repairs are made.

Shingles: A Popular Roofing Choice

Shingles have been a top choice for homeowners for decades due to their cost-effectiveness and aesthetic appeal. While they were once classified by their lifespan (e.g., 15-year or 25-year shingles), manufacturers now offer limited lifetime warranties. However, the actual lifespan depends on various factors, including weather conditions and maintenance.

How to Choose the Right Shingles

The weight of a shingle is a reliable indicator of its durability. Heavier shingles generally contain more material, making them better suited to withstand the elements. For instance:

• 3-tab shingles (e.g., BP Dakota or IKO Marathon) are single-layered and less durable.
• Laminated shingles (e.g., BP Mystique) consist of two layers fused together, offering a longer lifespan and a 3D appearance.

By 2024, most manufacturers, including BP and IKO, phased out 3-tab shingles in favor of laminated architectural shingles. These modern options are easier to install and provide superior performance, making them the preferred choice for most homeowners.

Why Choose Shingles?

- Aesthetic Appeal: Laminated architectural shingles create a stylish, dimensional look that enhances curb appeal. With a wide range of colors and matching flashings, they complement various home styles.

- Cost-Effectiveness: Although shingles were traditionally the more affordable option compared to steel roofing, the price gap has narrowed due to rising raw material costs and supply chain issues post-pandemic.

- Ease of Installation: Shingles are faster and simpler to install, reducing labor costs and project timelines.

At Quality Homes & Renovations, we help you evaluate your project’s specific needs to determine the best value roofing option.