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.

Yes, installing a new metal or tin roof can increase your home's value. A metal roof's longevity and durability are major selling points for prospective buyers, as it means they likely won't have to worry about a roof replacement. These roofs can last 40 to 80 years, which is significantly longer than traditional asphalt roofs.

In terms of return on investment (ROI), homeowners may see an increase in home value of around $7,000 to $8,000, which can represent 60% to 70% of the installation cost. Another way to measure ROI is per square foot, which can range from $3.00 to $8.40, with higher returns in areas where a durable roof is particularly beneficial.

You can install solar panels on a flat or pitched roof, but keep in mind that they will need to rest at a 30- to 50-degree tilt for optimal sun absorption. It costs more to install solar panels on a flat roof because you will need to install a framing system and likely hire a structural engineer. If your roof has a pitch of more than 40 degrees, it may not be a good candidate for solar panels.

If you're looking for a dependable and affordable option for garage roofing, asphalt shingles offer a durable way to blend a detached garage in with the surrounding residential aesthetic. If you're looking for a more durable and protective option because you're storing expensive equipment in your garage, consider metal roofs that perform well against snow, ice, hail, and heavy rains.