Your roof needs to be ventilated to protect the shingles and attic from excessive heat build up. Simply put, a flow of air enters through soffit vents, and then flows up through the rafters and out through a ridge vent. Installing ridge vents is a fairly aggressive project. Don’t attempt this project if you are uncomfortable with heights or uncertain about your carpentry skills. It is also not a project that can be left unfinished for any amount of time because you are opening your roof to the elements. Keep in mind that whenever you are working on ladders and high places, make sure you take proper precautions. Your ladder should be placed on firm ground and angled appropriately.