Roofs are made up of multiple layers of materials, each with a specific purpose. These layers include:
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- Roof decking
- Underlayment
- Ice and water shield
- Flashing
- Shingles
- Ridge capping
- Drip edge
- Starter strip
- Ridge vents and hip vents
- Insulation
- Drainage system
Built-up roofs are made by layering multiple layers of material, called "plies", to create a solid roof
covering. These plies are alternating layers of bitumen and reinforcing fabrics.