Overlay Shingles Roof

This has advantages and disadvantages and each of those should be weighed carefully.
Overlay shingles roof. An overlay roof occurs when keep your existing roof as is choosing instead to shingle on top of it. They also last longer and stand up to foul weather better than shingles. It s good to know that you can only choose this option if your roof has not been overlaid previously. However this can only be done once.
Metal roofs offer energy savings but do cost more upfront than traditional asphalt shingles. In general overlaying a new roof takes less time less labor and thus less money.
Source : pinterest.com