News & Advice

News & Advice

Why Can’t You Shingle A Flat Roof?

Why Can't You Shingle A Flat Roof

Shingles aren’t used on flat roofs because they require a slope to effectively shed water; flat roofs use materials like modified bitumen or TPO (Thermoplastic Polyolefin).

Shingling a flat roof is generally not recommended for several reasons…

  1. Water Drainage – Shingled roofs efficiently shed water, while flat roofs lack the necessary slope for effective drainage. Without proper drainage, water can accumulate on flat roofs, causing leaks, damage, and premature deterioration.
  2. Seams and Joints – Shingles have seams and joints that are vulnerable to water penetration, especially on flat roofs. Overlapping shingles increase the risk of water infiltration, making it essential to minimize seams.
  3. Durability – Shingles aren’t suitable for flat roofs. Specialized materials like built-up roofing membranes, modified bitumen, or single-ply membranes are needed for long-term performance.
  4. Code Compliance – Flat roof materials must comply with building codes and regulations for safety and structural integrity. Shingling a flat roof may not meet these requirements.

Overall, while shingles are suitable for sloped roofs, they are not recommended for flat roofs due to their inability to effectively manage water drainage and withstand the unique challenges posed by flat roof structures.



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