Poor attic air circulation is allowing moisture, mold spores and dry rot to occur in this home’s attic.
Poor attic air circulation

Poor attic air circulation is allowing moisture, mold spores and dry rot to occur in this home’s attic.
Wood rot discovered at the bottom of this post will require extensive repairs.
Replacement of this sliding door in near future is likely due to the dry rot damage that is present.
Fire resistant plywood that has become defective.