Get matched with top roofers in Worthington, MN

You can only overlay a roof once. Any additional layers of shingles will add too much weight and may also violate building codes. Once your roof has had an overlay, you’ll need to have a full roof replacement, including a tear-off of all existing roofing materials, when it’s time for a new roof. 

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.

The common formula for measuring a roof is length x width equals square footage. Professional roofers measure the length and width of your roof, including dormers, and determine its pitch and rafter sizes. If a roof surface is a triangle, they’ll divide that square footage by two, then add up the square footage of each surface to get the total for the roof.

While you can technically install TPO roofing over an existing roof, it isn't always wise to do so. The more layers of material you add to your roof, the more weight it must support. You may also develop moisture issues by covering your existing roof with TPO. Your local building codes and regulations may actually require you to remove the existing roof before adding TPO, so check with your local municipality.