CHAPTER 8 — Fiberglass Asphalt Shingles & Post-War Roofing (1950–1980)
After World War II, Canada experienced a massive housing boom. This period transformed roofing once again as fiberglass-reinforced asphalt shingles replaced older organic felt shingles. Lighter, stronger, and more moisture-resistant, fiberglass shingles became the new standard for Canadian suburbs during the second half of the 20th century.
Why Fiberglass Shingles Replaced Organic Shingles
- Improved durability: Fiberglass matting resisted rot, moisture absorption, and structural warping.
- Lighter weight: Reduced stress on roof decking and made installation easier.
- Better fire resistance: A major selling point for insurers and builders.
- Lower cost: Mass production lowered manufacturing and installation expenses.
The Canadian Post-War Housing Boom
Between 1950 and 1980, millions of new homes were built across Canada. Developers needed affordable, rapid, and predictable roofing systems — making fiberglass shingles the obvious choice. Entire subdivisions in Ontario, Quebec, and the Prairies standardized this material.
Technological Improvements
- Colored mineral granules improved UV resistance and aesthetics.
- Self-sealing strips enhanced wind resistance.
- Laminated (architectural) shingles emerged in the late 1970s as a premium option.
Performance in Canadian Climates
Fiberglass shingles performed better in freeze-thaw cycles, resisted cracking, and absorbed far less water than their organic predecessors. They also reduced winter ice-dam issues in properly ventilated roofs.
Long-Term Impact
By the 1980s, fiberglass shingles became the dominant roofing material in Canada — a position they still hold today in most residential subdivisions. This era shaped the look and construction standards of modern Canadian homes.
This chapter is part of the ROOFNOW™ Canadian Roofing History Archive.