For more than a century, roofing felt has been a familiar sight across Canada’s diverse landscapes—from the coastal homes of British Columbia to the farm buildings of the Prairies and the cottages of the Maritimes. What began as a simple, tar-soaked paper has evolved into a high‑performance roofing system that meets the demands of modern architecture and Canada’s challenging climate. Let’s take a closer look at how roofing felt has developed over time and why it remains a trusted choice for Canadian builders and homeowners.

The Early Years – Tar and Simple Materials

The earliest forms of roofing felt appeared in the late 19th and early 20th centuries. Builders used paper or fabric sheets soaked in coal tar or wood tar to create a waterproof barrier. It was an inexpensive and accessible solution, especially for sheds, barns, and smaller homes in rural areas.

However, these early materials had clear drawbacks. Tar became brittle in cold weather and softened in the summer heat, leading to cracks and leaks. Maintenance was frequent, and the roofs often had to be replaced after only a few years. Still, this simple technology laid the foundation for the durable roofing membranes we know today.

The Shift to Bitumen – A Technological Leap

By the mid‑20th century, the roofing industry began replacing tar with bitumen, a by‑product of petroleum refining. Bitumen proved far more stable and flexible, performing well in both freezing winters and hot summers—an essential quality in a country known for its temperature extremes.

At the same time, the base materials improved. Instead of paper, manufacturers began using glass fibre mats and later polyester reinforcements, which added strength and extended the lifespan of the roofing. This combination of bitumen and modern reinforcement transformed roofing felt from a temporary fix into a long‑term roofing solution suitable for residential, commercial, and industrial buildings alike.

Modern Roofing Felt – Flexibility and Design Freedom

Today’s roofing felt, often referred to as modified bitumen membrane, is a sophisticated product. Most systems use two layers: a base sheet and a cap sheet, which are either heat‑welded with a torch or applied using self‑adhesive technology. The result is a seamless, watertight, and highly durable surface that can last 30 years or more with proper care.

Modern bitumen membranes are not limited to flat roofs. Architects and builders increasingly use them on low‑slope and even pitched roofs, thanks to their flexibility and clean aesthetic. They can be finished in various colours and textures, allowing for creative design solutions—from sleek urban homes to green roofs that support vegetation and improve insulation.

Sustainability and Environmental Considerations

Sustainability has become a key focus in Canadian construction, and roofing felt is no exception. Manufacturers are developing products that incorporate recycled materials, reduce energy use during production, and support circular building practices. Some systems are designed for easy recycling at the end of their service life.

Roofing felt also plays a role in sustainable building design. It serves as an ideal base for green roofs, which help manage stormwater, reduce heat islands in cities, and promote biodiversity. In cold climates, bitumen membranes contribute to better insulation and energy efficiency, helping homeowners reduce heating costs.

Maintenance and Longevity

A modern bitumen roof requires relatively little maintenance, but regular inspection is still important. Debris, leaves, and moss should be cleared away, and seams or flashing should be checked for wear. With proper installation and periodic care, a bitumen roof can last for decades—often outlasting many other roofing materials.

From Humble Beginnings to High‑Performance Roofing

The story of roofing felt is one of continuous innovation. From the early tar‑soaked papers of the past to today’s engineered bitumen membranes, the material has adapted to meet the evolving needs of builders and the harsh realities of the Canadian climate. Combining tradition, technology, and sustainability, modern roofing felt remains a reliable and versatile choice—one that will continue to protect Canadian homes and buildings for generations to come.