Shingles are just the first line of defense for your roof. Backing them up is the underlayment attached to your roof decking. Traditional asphalt felt is made of organic material such as wood pulp, it’s heavy, can tear easily, and is prone to degradation from UV exposure. Karis Construction chooses to use the Atlas synthetic underlayment which has multiple benefits. The underlayment is lighter, which helps our roofers install the rolls faster and easier, and benefits distributers as well. The synthetic material provides enhanced protection against water and mold growth. The synthetic material is stronger, tearing less frequently than traditional felt and includes a UV coating further protecting the underlayment and health of your roof.