Ice Dam Resolution?
The distance up from the eaves is not based on your roof, it is based on your exterior walls. Proper installation is minimum of 2 feet beyond all exterior walls. How far up the roof depends on your soffit overhang and pitch of your roof. Each structure must be calculated accordingly. IE, if you have 12" soffits on a 6/12 that's going to put your exterior wall roughly 14" up the roofdeck, add two feet to that. Most ice/water is roughly 39" so one run would be adequate. If you have 2' soffits it changes the equation and you would need at least 1 1/2 runs. Hope that helps
Last edited by OldNBroken; 02-19-2009 at 10:13 AM.