Hello Im helping out a friend installing a through the roof kit. (cathedral ceiling) my only question is when I look at the book they want me to only place the top of the flashing under the top shingles. I have been doing HVAC for a while now and I have always been told to start low and work the flashing up. I just wasn't sure if it calls for the installation this way for a reason. (it is a ventilated flashing) any help would be great. It is simpson dura vent
thanks Jason
thanks Jason