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Old 09-13-2007, 03:42 PM   #1
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Flat roof venting question


Hi all,
I have a newer rubber roof on a 1915 house. Its a square roof with the joists running the long way from from to back and the roof slopes from front to back (for water runoff).

Right now there are a few small turbine roof vents towards the front of the house.

I plan to raise the ceiling on the 3rd floor to the joists (leaving about 3 inches btwn insulation and roof for venting).

The problem is that these couple vents will now only vent 2 spaces between the joists (there will be no way for air to flow between joists) since I am raising the ceiling to the joists.

My question is this:
Is there some type of line vent for a flat roof? I was thinking a roofer could basically cut a slice the length of the roof (towards the front/higher section) perpendicular to the joists and cap it in some way?

There must be some solution for this.

Thanks


(heres my wonderful 1 minute depiction)


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Old 09-13-2007, 09:11 PM   #2
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Flat roof venting question


you can make it yourself or use a clerestory vent to cap the vented area,depending on the roof pitch

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Old 09-13-2007, 10:03 PM   #3
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Flat roof venting question


clerestory Vent? Please help an old roof dog learn a new trick.
I taint near ever seen nothin like dat. Got a link or pic?

tryin to fix stupid here! Thanks for your help
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Old 09-13-2007, 10:10 PM   #4
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Flat roof venting question


http://[URL="http://www.airvent.com/professional/products/ridgeVents-specialtyFilter.shtml"]www.airvent.com/professional/products/ridgeVents-specialtyFilter.shtml[/URL]
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Old 09-13-2007, 10:15 PM   #5
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Flat roof venting question


there you go big fella!
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Old 09-13-2007, 10:31 PM   #6
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Flat roof venting question


Thanks, I was having trouble googling "clerestory vent" for information as well. I now know what "net free area" is though. The image you provided is a "peak vent". Im having trouble visualizing how that piece would be applied to a flat roof.

Also, would this type of vent provide enough ventilation?

Thanks
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Old 09-13-2007, 10:47 PM   #7
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Flat roof venting question


that`s what" air vent " calls it,the old "lomanco" term is clerestory vent,that`s what you call where the rafter ends at one side,rather than where a ridge beam connects to another,typical of contemporary style homes,the diagram he showed has pitch ,iyou would cut the 3/4" slot same as ridge vent, set elastomer sealant done on the roof where the vent will be secured,set the vent in it,w/a lower pitch I would flatten the gutter style lip before installation so there`s no problems
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Old 07-16-2008, 12:26 PM   #8
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Flat roof venting question


How id it go? I need to do something similar and would like to know the results.

-Jay
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Old 07-17-2008, 04:45 PM   #9
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Flat roof venting question


Project got reduced to a point that didnt include removing the ceiling. Sorry.

Quote:
Originally Posted by jayshultis View Post
How id it go? I need to do something similar and would like to know the results.

-Jay

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