willshak wrote:
Ridge vents can be added at any time, including roofs that have been
shingled recently or even years ago. You can do it yourself if you are
not afraid of heights, have basic carpentry skills, and have access to
tools like a chalk line, hammer, and circular saw. Here's a how-to:
http://www.easy2.com/cm/easy/diy_ht_...ge_id=35693724

If you are in Florida make sure that the ridge vents that you choose are
on the statewide Product Approval list. Otherwise you risk installing
vents that aren't tested for wind-driven water intrusion.