Are particularly good for buildings in colder climates (significant snow and rain accumulation). Some materials, like slate, are known for lasting upwards of 50 years. Slanted roof have a longer lifespan then flat roofs. Most common asphalt shingles last between 15-30 years. Slanted design help roll off moisture.
The material used for these roofs is usually bitumen or synthetic compound designed specifically for roofing purposes. A base layer protects the underside and a top layer coats and protects the roof’s surface. Easy to maintain and can be done by homeowners themselves. Flat roofs need to be re-coated every 5 to 7 years to make sure they are sealed. It has to be frequently inspected to prevent bubbles from forming and bursting along their surface.
A larger building will be more stable with slanted roof than a flat roof. Residential buildings are usually built in a way that flat roofs are being a fine option, but large buildings may be more structurally safe when slanted roof is installed. With the right roof, your house will be dry and aesthetic for years to come.