When I was in seminary, I went out on a service project with some of the guys. Among them were a couple of men from Nigeria. We went to help Habitat for Humanity strip down a house in St. Paul, MN. And it was an old house. My job was to remove as much of the siding as possible, getting all the way down to the original wood slats on the exterior. I spent all day on one side, removing vinyl siding to reveal shingles. Underneath the shingles was kerosene paper (which I had never encountered before). Under the kerosene paper was the wood slats I sought.