Install Underlayment and Moisture Barrier

What happens here

The roofing crew begins by installing underlayment layers on the roof deck. This includes a black ice and water barrier near the eaves and along edges, followed by a blue synthetic moisture barrier (likely a type of roofing felt). These layers are crucial for waterproofing and protecting the roof deck from water infiltration, especially in cold weather environments prone to ice damming. The underlayment is laid horizontally across the roof, overlapped, and secured to the plywood sheathing. This process is shown being done by two roofers working collaboratively on ladders.

Goal: Apply layers of ice and water barrier, followed by a synthetic moisture barrier, to waterproof and protect the roof deck in preparation for metal panel installation.