Brian writes from Jacksonville, Florida: "I have a 1960 gable roof and I want to insulate the attic (blown-in). I have soffit vents (unable to install rafter vents, too tight to reach from inside attic). I plan on adding Ridge Vents. Could there be an issue with rafter vents not being installed? Can they be installed from outside the house at the eaves? Can they be glued?"

Answer: If you are able to install the soffit vents from the outside I see no problem in doing so. You should be able to staple half of the vent from the outside and maybe half from the inside. Glue is not a recommendation.

Installing the soffit vent is important because that is where air will enter the attic. The ridge vents act as the attic's exhaust.