Originally Posted By: jpeck
This post was automatically imported from our archived forum.
Depending on the roof slope, that only needs to be 12" high and up. That one probably only needs to be 12" high, measured on the high side.
The Roof Flashing is missing.
The storm collar is your flashing you are point to, that goes around the B vent at the top of the Roof Flashing (which is missing).
As to the height, there is no specified maximum unbraced height, except that the longest piece of B vent them make is (I believe) 5' long, and having a joint above the roof is not good for strength (although it is allowed for height extension).
Down here (where you and I are, that is going to blow off during the first high wind storm (never mind a real hurricane), right at that joint under the storm collar, where the B vent sections change color).
Like these from last week.
[ Image: Type B Gas Vent with joint at storm collar
[ Image: yes, it's this loose at the joint
Dura-Vent Installation Instructions