In this episode, Joe, the homeowner, fabricates a stone hearth, and Richard learns about automatic sprinkler systems. Then, Kevin sees a simulator that shows how the Camp Fire spread. Tom inspects a vent that’s designed to resist embers, and another project gets the green light. Richard travels to Salt Lake City to replace a shower valve he has never seen before in his career with a conventional pressure balanced one; Nathan demonstrates how to refinish stair treads; Tom helps a homeowner remove moss from his roof and prevent it from growing back.