How are the Revolv roof jacks measured for 21” to 35”? Is the measurement taken below the roof flashing?

To measure for the correct size roofjack needed, take the following steps: First, take two measurements from where the furnace is located - measure the distance from the floor to the ceiling and the distance from the ceiling to the roof. Next, add those two measurements together. Then, subtract the height of the furnace from your combined measurement. Finally, your end result is the height of the roofjack you need.

If you have any further questions, please call us and we will be happy to assist you.