10-24-2014, 06:06 AM
We put in a gable mount one, so our experience will not help, but have seen them installed much like any attic mount ....either
get a flat section for the mount that goes from the roof ridge down (HPM roofing makes them for their metal roofing, if you are not sure who made your roofing, can always to the measure to see...),
get flexible flashing (many are lead so those are not good for catchment) that fits the cowl of the vent (not really a great method as you can get some damming of water behind the flashing) or
cut a hole & just stick it in with a lot of rubber flashing tape (I would never recommend this method, nor do any roofing texts I have found, but it is really common on this island to pack any roof puka with that tape and call it done!... course you are gunna have problems down the line, but you can always use more o that tape....sooo...)
get a flat section for the mount that goes from the roof ridge down (HPM roofing makes them for their metal roofing, if you are not sure who made your roofing, can always to the measure to see...),
get flexible flashing (many are lead so those are not good for catchment) that fits the cowl of the vent (not really a great method as you can get some damming of water behind the flashing) or
cut a hole & just stick it in with a lot of rubber flashing tape (I would never recommend this method, nor do any roofing texts I have found, but it is really common on this island to pack any roof puka with that tape and call it done!... course you are gunna have problems down the line, but you can always use more o that tape....sooo...)