The answer to 'best underlayment' is that the best underlayment for your roof depends on the type of roofing material you are using, the climate in your area, and your budget. Underlayment is the water-resistant barrier installed between the roof deck and the roofing material, and it plays a critical role in protecting your home from leaks and water damage.
Some of the most common and effective underlayment options include asphalt-saturated felt paper, synthetic underlayment, and self-adhering rubberized asphalt underlayment. Asphalt-saturated felt paper is a traditional and affordable option, while synthetic underlayment and self-adhering rubberized asphalt offer enhanced waterproofing and durability. The best choice for your home will depend on the specific requirements of your roofing project.