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-   -   How to properly vent lower roofs? (http://www.houserepairtalk.com/f34/how-properly-vent-lower-roofs-15892/)

o2284200 04-24-2013 10:12 AM

How to properly vent lower roofs?
 
In the middle of 2nd day of re-roof...

The 2 lower roofs, which share a small attic crawl space have what appears to be ample intake soffits on the front & sides but I'm trying to figure out the best way to vent outward from the near top without ruining aesthetics.

I've added 2 goose-necks to the back of the upper roof but I really don't think that will look good in the front lower roofs. I'm considered trying to put some sort of "gable vent" on one or both ends but your thoughts & opinions would be greatly appreciated!

FWIW, this is stucco over concrete block in Dade county, Florida within 1/2 mile of ocean.

THANKS!

http://imageshack.us/a/img443/420/dsc0307gu.jpg
http://imageshack.us/a/img845/377/dsc0317qu.jpg
http://imageshack.us/a/img5/7330/dsc0318xv.jpg

nealtw 04-24-2013 10:49 AM

The vents in the lower two photos are in the overhang on the sides, in most cases there isn't access to the attic from there unless someone cut into structure. In some cases the roof has been strapped sideways with 1x4 or 2x4 and then you will have some air movement there.

o2284200 04-24-2013 11:23 AM

Thanks, there are intake soffit vents in both lower overhangs on the front too.
And there's a crawl space that gives access to both lower overhang attics.

nealtw 04-24-2013 11:56 AM

Stick your head up in the attic and see if there are openings from the attic to where the vents are on the sides, if not look to see if the roof sheeting is nailed to the rafters or is there strapping between the rafters and the sheeting, if the answer to both is no then you need more venting, if the answer is yes to one or both, you likely are fine.

oldognewtrick 04-24-2013 12:38 PM

At the spot where the lower roof runs into the wall you should use a vent like Smart Vent that allows for head wall exhaust. Then the counter flashing should be fabricated go cover the Smart Vent.

CallMeVilla 04-24-2013 12:44 PM

Heck! OldDog beat me to it ... Smart Vent has an application which applies to this situation. You might call it a "shed roof to wall" application because you have vents at the bottom but not at the top.

Go to their site: http://www.dciproducts.com/html/smartvent.htm

Get 'er done! Do it right! :D

o2284200 04-24-2013 01:17 PM

Here's a shot in the attic looking at the lower right side of house or the 3rd pic from above. I can see the openings on this side but I was not able to get near the other side so I can only assume it;s the same set up.
http://imageshack.us/a/img832/6236/s...rsouthroof.jpg

oldognewtrick 04-24-2013 02:39 PM

You should close off the side vents and have a continues vent strip along the eave for air intake and a continous vent at the wall for exhaust. The vents along the side will allow the vent system to short cycle.

o2284200 04-24-2013 03:11 PM

Quote:

Originally Posted by oldognewtrick (Post 86355)
At the spot where the lower roof runs into the wall you should use a vent like Smart Vent that allows for head wall exhaust. Then the counter flashing should be fabricated go cover the Smart Vent.

Quote:

Originally Posted by CallMeVilla (Post 86356)
Heck! OldDog beat me to it ... Smart Vent has an application which applies to this situation. You might call it a "shed roof to wall" application because you have vents at the bottom but not at the top.

Go to their site: http://www.dciproducts.com/html/smartvent.htm

Get 'er done! Do it right! :D

Thanks, that looks awesome, would you go all the way across the top on each side of the lower roofs?

Also was looking at O'Hagins...
Has anyone had experience with their "Vents for Tile Roof Applications" http://www.ohagin.com/products_tile.asp ???

CallMeVilla 04-24-2013 05:30 PM

1 Attachment(s)
The application requires a gap at the top. You can cut the sheathing to create this gap and apply the Smart Vent all the way across. The flashing will have to be determined based on your wall structure. The couter-flashing makes perfect sense.

http://www.dciproducts.com/html/shedroof.htm#offwall


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