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You can technically install a metal roof over asphalt shingles, but it isn’t a good idea. This is because you’re essentially creating a moisture barrier under the metal, which can easily—and often does—lead to significant mold damage. Removing an asphalt roof isn’t terribly expensive, and some roofing companies might cut you a serious labor and disposal discount if you add it to a new install.

Roll roofs don’t last as long as traditional roofs, like those made of asphalt shingles. A roll roof typically lasts between five and 15 years, whereas a shingled roof will last between 20 and 50  years. Modified bitumen roofs are similar in look to rolled roofing but have a 12 to 15 year warranty.

Though people use the terms interchangeably, there are some notable differences between wood shakes and shingles. Wood shakes are hand-split from trees and thus have a more textured appearance. They’re also usually thicker (and may not be perfectly uniform). Wood shingles are smoother, thinner, and more uniform than wood shakes.

Because truss manufacturers can stockpile the necessary lumber and other materials for truss construction, and the manufacturing takes place in a single, climate-controlled location, trusses are often for sale for less than the raw material cost to construct rafters on-site. Additionally, truss installation is much faster than rafter construction, so you'll also save on labor costs.