When choosing a roof, it’s not enough to look at the price or style. A roof also has a story that runs from making it, to using it, to what happens when it wears out. This is called lifecycle analysis (LCA). LCA looks at:
- How much energy it takes to make.
- How much carbon it creates.
- How long it lasts.
- If it can be recycled.
Metal Roofing
Metal roofs can last 40–60 years. Many are made with 25–95% recycled metal. Almost all of it can be recycled again at the end. Metal creates about 25% less pollution than asphalt shingles across its life.
Clay and Slate Tiles
Clay is made in hot kilns, and slate is cut from rock, so both need a lot of energy to produce. But they last a long time—75–100 years or more. They are also natural and safe to recycle.
Green Roofs
A green roof uses more energy at first because it needs soil, plants, and special waterproof layers. But after that, it saves energy. A green roof can cut heating and cooling use by up to 30% each year and helps cool cities.
Solar Roofing
Solar panels and shingles take a lot of energy to make. But once in place, they pay back that energy in 2–4 years. After that, they give clean power for decades.
Asphalt Shingles
These are cheap but harmful. They last only 15–20 years, use a lot of oil, and are hard to recycle. Most go to landfills where they stay for hundreds of years.