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gwilkrrs 10-19-2012 07:16 AM

best ridge vent for cathedral cielings
recent addition is cathedral ceiling 5/12 pitch. it is a 20 x 40 that has a "T" shaped roof where 1 ridge ties into the other one in the middle. what is the best ridge vent to use with this senario- is a cobra roll vent ok? there will be vented soffitts.... thanks.

joecaption 10-19-2012 07:48 AM

Personaly I'd pass on using any of the roll vents. Use one like this instead.

My local shingle distributors have stopped even carrying them because of all the complents.

How wide a rafter are you using? A ridge vent and soffits are usless unless you have room for baffles and still have room left for the proper insulation.

gwilkrrs 10-23-2012 06:47 AM

thanks. 2"x12" rafters with insulation at the bottom-ceiling side- leaving 1" of open space to the roof side for air flow.

shazapple 10-23-2012 06:51 AM

Joe is right, the roll style vents depend a lot on the installer. If they overdrive the nails you lose a good portion of your ventilation.

bcdemon 10-23-2012 08:01 AM

Cobra Vent (AKA Roll of S.O.S Pad) is useless IMO. Although it's "bird friendly" as I see them using it for nesting all the time lol. The one Joecaption offered is a better option. I use Lomanco OmniRoll vent, very similar to the one joecaption posted above.

gwilkrrs 10-23-2012 11:21 AM

thanks. i will be the installer. i used the cobra vent roll when i re roofed my house 6 years ago. it was easy to work with but seems rather basic.....

i want to put in a functioning vent to avoid any problems- when i did the house i created a draft inside..... the house is a 1952 cape cod that had 2 small gable vents solid soffit with 0 vent and no ridge vent and minimal insulation. i installed blown in insulation, vented soffit and a ridge vent. during the first winter after this work you could feel a draft inside that wasnt present before.... still debating on blocking the gable vents off to see if this helps, i made sure the insulation wasnt blocking the eaves...

bcdemon 10-24-2012 07:37 AM

If you have soffit intake and ridge vent, I would close off the gable vents, just counterproductive to the venting system.

And if you felt a draft in your house once you vented your roof, I would say the seal between your living space and your attic is leaking big time.

gwilkrrs 10-26-2012 07:05 AM

thanks! yes the seal is bad somewhere. it is ballon framed with no wall insulation. i blew down into the open stud bays from the attic the best i could but.............

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