For Round Back & Keepa Roof Jack Vent Caps

How much clearance (height) does your roof jack vent cap need?

The answer depends on
1) The placement of the roof jack on the roof.
2) The type of roof you have (how pitched or how flat)
3) The climate zone you live in

For 3/12 pitch roofs or higher, Roof Jacks can have a 2" tall collar if they are less than 3 feet from the peak of the roof. In climates zones 4 and higher, a snow guard/rain diverter should be above your roof jack vent cap. This will ensure protection from sliding ice and rushing water.  

For 3/12 pitch roofs or higher, with the vent in the mid to lower portion of the roof you will need:

  • 4″ tall collar for zones 1, 2 & 3 
  • 4" tall collar for zone 4. A snow guard is highly recommended.
  • 4″ tall collar for zones 5 & 6. A snow guard is required.
  • 11″ or 12″ tall collar for zones 7 & 8. A snow guard is required. 

For roof pitches 2/12 or less you will need:

  • 4” tall collar in zones 1 & 2
  • 6" tall collar for zones 3 & 4
  • 8” tall collar for zones 5 & 6
  • 11″ or 12” tall collar for zones 7 & 8

You can use taller collars for additional clearance in warmer climate zones. However, you can’t use shorter collars in colder climate zones. For more information on AVP's roof jack vent caps view the keepa roof jacks or round back roof jacks.

Click here to find the zone of your county.

Source: US Office Of Energy Efficiency & Renewable Energy
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