November 20th, 2011 10:24 PM by Dan Howard
PIPE FROM PLUMBING RUNS INTO THE ATTIC, BUT NOT THROUGH THE ROOF
This is a pipe from the sewer that goes up to the roof area, but not through the roof. The sewer gas, which includes potentially explosive methane and lots of organic ( sewage ) particles vent into the attic. A wet, organic rich coating on the roof plywood will ( and in this instance did )eagerly grow mold. The common term for the pipe is stink pipe.....one more reason to extend that pipe up through the roof.