Underlayment is a felt (15 lb, 30 lb, or synthetic) material used over your decking to provide additional protection. That makes it a crucial component to your roof.
That's why we make a video breaking it down. In the video above, you'll learn what roof underlayment it is, types, how it impacts the cost of your roof replacement, and more.
After watching this video, don't forget to check out our next video on Drip Edge.