Asphalt shingles. They degrade over time and can’t be replaced piecemeal. They’re cheap and easy to lay down. I think the original idea behind them was that the

Asphalt shingles. They degrade over time and can’t be replaced piecemeal. They’re cheap and easy to lay down. I think the original idea behind them was that the home owners could DIY cheaply every 10-15 years but both houses and people have moved away from that being considered an option. If you have a low pitch roof without a lot of valleys it’s still easy to do though.