In Part 1 of our Roofing 101 series, we focused on the first layer of defense your roof provides — the leak barrier.   In Part 2 of the series, we shift our attention to roof deck protection, an underlayment that assists in shielding your roof deck from moisture infiltration. In case you’re not familiar, an underlayment sits just above the leak barrier, and underneath the rest of the components of your roof. Underlayments can be made of different materials, including asphalt saturated felt and more modern, synthetic materials.  The significance of roof deck protection is the fact that it covers your roof deck and its sole purpose is to act as a secondary moisture barrier — going a long way in preventing wind-driven rain from breaching your roof and causing damage to your home. That said, the roof deck protection product your roofing contractor uses is a critical component to the roof replacement process. At Legacy Exteriors, our asphalt roofing brand of choice is GAF. Their products are fantastic, and they are also America’s #1