There are multiple ways to install a new roof to an existing construction. If the roof has sustained significant damage or worn down an incredible amount, it may be worth it to have the roof completely replaced. Tear-off services install a new roof by “tearing off” the shingles of a roof to start completely from scratch. This is often the most effective way to install a new roof to your home. Overlays, on the other hand, implement new shingles over the existing ones. This is an easier method, but it can cause the shingles to wear down much faster, while a tear-off technique ensures that the roof is built on a firm foundation.