Here are some Handy Tips from RMC Services Inc.
Never stack wood, or pile dirt or land scaping material above the bottum edge of your siding. It will provide easy acces to your house, for a number of wood damaging insects.
Terminating your bath fan directly into the attic, with out a proper exhaust line, is a bad idea. It can cause unwanted mold or moister problems. Running a exhaust line and installing a vent to the out side is always best.