A roofing underlayment is the protective sheet placed right under your shingles. It stops water from seeping in, keeps moisture from rotting the roof deck, and adds an extra layer of defense during storms.
For homeowners in Toronto and Hamilton, this layer is vital. Our roofs face heavy snow, ice, and sudden temperature swings that test every joint and nail.
Whether you use tar paper for roofing or roofing felt, as preferred by Ontario contractors, the material alone isn’t enough. Its performance relies on accurate installation. A small gap or wrinkle can let in water and cause damage over time. Therefore, for reliable roof protection, it is essential to consider professional help.
What Is Roofing Felt and Why It’s Still Common in Ontario
Roofing felt is one of the oldest types of underlayment used in Canada. It’s made from fiber sheets soaked in bitumen, which helps block water and protect the roof deck. For decades, homes across the GTA have used roofing felt paper because it’s affordable, easy to install, and reliable in most weather conditions.
Many roofing contractors Toronto homeowners trust still recommend it for standard pitched roofs, where it provides steady protection against leaks. You can find roof felt at Home Depot or get it through local roofing experts.
Either way, it remains a reliable choice that many Toronto homeowners continue to use to protect their roofs from leaks and harsh weather conditions.
Benefits of Roofing Felt
- One of the main roofing felt advantages is that it shields the roof decking from moisture, keeping wood from swelling or rotting.
- It also helps shingles stay stable during temperature swings, reducing cracks and early wear.
- Roof felt Ontario homeowners can find it almost anywhere, and small repairs are quick and inexpensive.
- In Hamilton, where roofs face milder conditions, roofing underlay made of felt is a simple, budget-friendly option that still gets the job done.
When to Seek Professional Guidance
If your shingles start curling or you notice brown stains in the attic, it’s a good time to book a roof inspection Toronto homeowners can count on. These are often early signs that the underlayment is no longer doing its job. Keeping up with regular roofing checks helps you address small problems before they escalate.
A professional roofer can inspect the entire roof, identify damaged areas, and advise you on whether switching to asphalt felt or a stronger synthetic material would be a wise move.
Tar Paper: The Traditional Material Still Found on Older Roofs
One of the oldest roofing materials is tar paper, made from fiber sheets soaked in tar instead of bitumen. It was widely used decades ago for its strength and water resistance, and you can still find it under many older roofs. In downtown and heritage areas, it’s common to see tar paper that Toronto homeowners inherited with their vintage homes or garages. While it offers basic protection, it doesn’t perform as well in modern weather conditions as newer materials. For repairs or upgrades, roofing tar paper Hamilton specialists often suggest replacing old felt tar paper with improved underlayment options.
Strengths and Drawbacks
- One of the main strengths of tar paper is that it’s affordable and easy to install, which makes it useful for smaller projects like sheds or garages.
- When comparing tar paper vs roofing felt, felt lasts longer and stands up better to changing weather.
- Tar paper can tear in cold temperatures and slowly lose its waterproofing as it ages.
- Though you can still find tar paper, home hardware, or other roofing paper that Ontario stores carry, it’s not ideal for roofs that face heavy snow or frequent freeze-thaw cycles.
When to Consider Professional Replacement
If your roof still has old tar paper or you’ve noticed blistering or soft spots, it’s time to call a roof replacement expert in Hamilton before re-shingling. A professional can safely remove the worn layer and install modern materials, such as asphalt felt or synthetic underlayment, that meet today’s building codes.
This kind of roofing felt upgrade Toronto homes benefit from also helps improve insulation and moisture control. Hiring a skilled roofing contractor in Ontario ensures proper installation, preventing trapped moisture and hidden wood rot, which are common problems in older Hamilton houses.
Asphalt Felt: The Reliable Option for Harsh Canadian Winters
Asphalt felt is a durable type of underlayment made from heavy paper sheets that have been soaked in asphalt for added strength and waterproofing. It’s usually available in two grades: #15 and #30, with the thicker option offering more protection for harsh weather.
Many Toronto and Hamilton roofers trust asphalt roofing felt because it performs well under snow, ice, and strong winds. The asphalt-saturated felt layer acts as a dependable barrier against moisture and cold air.
For extra protection, contractors often recommend 15-lb asphalt felt, which Toronto homeowners can rely on to keep their roofs stable throughout Canada’s long, freezing winters.
Types of Asphalt Felt
- Asphalt felt type 15: It is a lightweight roofing felt made from asphalt-saturated organic felt. It is commonly used for smaller projects or low-cost repairs where minimal moisture exposure is expected. While it offers basic protection, its thinner structure makes it less suitable for long-term or high-moisture environments.
- Asphalt felt type 30 is thicker and more durable than asphalt felt type 15, offering stronger resistance to tearing and water penetration. This makes it the preferred choice for sloped roofs and homes in colder climates, such as Ontario, where ice and heavy snow can strain roofing layers.
In many modern installations, both asphalt felt type 15 and asphalt felt type 30 are combined with ice and water shield membranes to create a stronger, more watertight barrier beneath shingles. These layers work together to protect the roof deck from leaks, condensation, and wind-driven rain, ensuring longer roof life and consistent performance.
Synthetic Underlayment: A Modern Upgrade
Synthetic roof underlayment represents the newest advancement in residential roofing, especially popular across Toronto suburbs and modern Hamilton homes. Made from high-strength polypropylene or polyester, it provides superior resistance to tearing, UV exposure, and moisture absorption.
Unlike traditional felt, it remains lightweight and easier to handle during installation. Many builders now choose this material for its stability under shingles and improved traction for workers.
As more homeowners compare synthetic vs. felt underlay systems in Toronto, the preference leans toward synthetic due to its long-term reliability and reduced maintenance, making it a preferred roof underlay in Ontario for modern builds.
When Homeowners Should Consider It
Homeowners planning a full roof replacement or upgrading to a premium roofing system should look into synthetic underlayment Hamilton options. This material performs especially well in areas near Lake Ontario where humidity and wind exposure are constant concerns. Its durability and moisture resistance make it a smart choice for long-term protection.
However, correct installation is essential. Professional roofers use proper tensioning and fasteners to keep the material firmly in place beneath shingles. As more people shift toward modern roofing materials in Ontario, synthetic underlayment stands out for its strength, stability, and dependable weatherproofing.
Tar Paper vs Roofing Felt vs Asphalt Felt: Comparison Table
| Feature | Tar Paper | Roofing Felt | Asphalt Felt |
| Durability | Basic | Moderate | High |
| Water Resistance | Low | Good | Excellent |
| Lifespan | Short | 10–15 years | 15–25 years |
| Cost | Low ($0.10–$0.25/sq ft) | Medium ($0.25–$0.50/sq ft) | Medium ($0.40–$0.70/sq ft) |
| Climate Suitability | Mild | Variable | Best for snow and cold |
| Professional Recommendation | Replace | Common choice | Strongly recommended |
How Toronto and Hamilton Homeowners Can Make the Right Choice
For Toronto and Hamilton homes, choosing the right underlayment depends heavily on the roof’s design, location, and exposure.
Tar paper for roofing works best on small sheds, garages, or older homes with simple, low-pitch roofs in areas that don’t face heavy snow, such as midtown Toronto neighborhoods with moderate winter conditions. It’s less suitable for main residential roofs in north or west Hamilton, where snow piles up and freeze-thaw cycles are frequent, because it can tear and lose waterproofing over time.
Roofing felt is a solid choice for standard-pitched roofs in suburban Toronto and Hamilton areas, where winters are typically mild but not extreme, offering moderate protection and easy availability. It’s not ideal for large, exposed roofs or homes near Lake Ontario where ice dams form, because its water resistance is limited.
Asphalt felt, including 15 lb or 30 lb grades, is preferred for homes in neighborhoods that experience heavy snowfall, high wind exposure, or frequent ice buildup, such as those near waterfront Toronto or in elevated Hamilton districts. It performs well under shingles, resists water penetration, and handles snow loads; however, it may be overkill for small outbuildings or low-traffic sheds.
Synthetic roof underlayment is ideal for new constructions or full roof replacements in Toronto and Hamilton homes near lakes or wetlands, where high humidity requires long-lasting moisture protection.
The best choice always comes after a professional inspection. Trusted roofing contractors in Hamilton can evaluate your roof’s structure, attic conditions, and exposure to help you pick the underlayment that will last the longest and protect your home through harsh winters.
When Professional Help Makes a Real Difference
Homeowners should consider professional help when
- Roofs are older than 15 years
- Leaks appear near flashing or valleys
- Shingles or felt layers are uneven or buckled
Experienced roofers bring the right tools and materials for Toronto and Hamilton’s weather, ensuring the underlayment and shingles form a watertight seal that lasts. This expertise not only extends the life of your roof but also protects the overall value of your home, giving peace of mind through harsh winters and unpredictable weather conditions.
Conclusion
All three underlayment options, tar paper for roofing, roofing felt, and asphalt felt, serve the same basic purpose of protecting your roof, but their performance varies depending on local weather conditions.
For Toronto and Hamilton homeowners, asphalt felt often provides the best balance of cost, durability, and protection. At the same time, synthetic underlayment is a premium choice for those seeking long-lasting performance in high-humidity or exposed areas.
Ultimately, proper installation by experts offering professional roofing services ensures correct sealing, alignment, and long-term roof stability, investing in your home’s protection a worthwhile endeavor.