DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Roofing and Siding > Gable Vents; type & material?




Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old 06-13-2013, 07:32 AM  
o2284200
Member
 
Join Date: Oct 2012
Location: , South Florida
Posts: 92
Liked 4 Times on 3 Posts

Default Gable Vents; type & material?

I'm adding a gable vent (non-powered & no fan) on both ends. Roofer recommends something no bigger than 12"x12" in aluminum with critter screen from big box stores. I'm thinking more a rectangle rather than a square. What else to consider...Do they open & close? I would appreciate your thoughts & opinions especially as to type and material. FWIW, this is stucco over concrete block in Dade county, Florida within 1/2 mile of ocean. THANKS!




__________________
o2284200 is offline  
 
Reply With Quote Quick reply to this message
Old 06-13-2013, 11:39 AM  
nealtw
Senior Member
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 9,006
Liked 690 Times on 617 Posts
Likes Given: 1211

Default

I went and read your old post again http://www.houserepairtalk.com/f34/how-properly-vent-lower-roofs-15892/

The biggist problem you had with the vents before, as they are now, is the short cercuit. Any air that needs to escape from the upper vents can be short cercuited by air coming in the lower vent on the same side. So closing the two lower vents on the sides would be first on my list. There is a space above the concrete wall on the side we can see, if both are the same the upper vents in the overhang should be enough although they should be closer to the top of the run. Then you want to check the vents across the bottom for enough air flow and maybe add more. I have assumed that you didn't vent across the top of the roof.



__________________
nealtw is offline  
 
Reply With Quote Quick reply to this message
Old 06-13-2013, 11:44 AM  
o2284200
Member
 
Join Date: Oct 2012
Location: , South Florida
Posts: 92
Liked 4 Times on 3 Posts

Default

Thanks!
Preparing to have rake vents closed off & add the gable vents; it appears too late for ridge across the top of the roof or any other reasonable options.

__________________
o2284200 is offline  
 
Reply With Quote Quick reply to this message
Old 06-13-2013, 11:51 AM  
nealtw
Senior Member
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 9,006
Liked 690 Times on 617 Posts
Likes Given: 1211

Default

Cutting thru block wall?

__________________
nealtw is offline  
 
Reply With Quote Quick reply to this message
Old 06-13-2013, 12:31 PM  
o2284200
Member
 
Join Date: Oct 2012
Location: , South Florida
Posts: 92
Liked 4 Times on 3 Posts

Default

Is there any other way?

__________________
o2284200 is offline  
 
Reply With Quote Quick reply to this message
Old 06-13-2013, 12:42 PM  
nealtw
Senior Member
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 9,006
Liked 690 Times on 617 Posts
Likes Given: 1211

Default

Well the question is why is there a block wall. It's not there to bear any weight so it has to be for the wind. Any change to that wants an opinion from some one who understands how to do it and not make it useless in the wind.

The other way: from above;
So closing the two lower vents on the sides would be first on my list. There is a space above the concrete wall on the side we can see, if both are the same the upper vents in the overhang should be enough although they should be closer to the top of the run. Then you want to check the vents across the bottom for enough air flow and maybe add more. I have assumed that you didn't vent across the top of the roof.

As you pointed out before there was lots of water leaks above and maybe no amount of venting could have kept the area dry. Givin that you should not a have a roof leak now and you are not worried about ice dams, I would not lose, wind protection for a little more venting. I would just improve the venting that you have.
That would bring it up to code where I am in a wet zone. You may want to take your photos and talk to the inspectors for the city and just get their opinion.

__________________

Last edited by nealtw; 06-13-2013 at 01:01 PM.
nealtw is offline  
 
Reply With Quote Quick reply to this message
Old 06-13-2013, 12:55 PM  
o2284200
Member
 
Join Date: Oct 2012
Location: , South Florida
Posts: 92
Liked 4 Times on 3 Posts

Default

You're correct. From what I'm learning, most single family homes in this area are concrete block... mine is also & yes, we'll have to cut thru the block wall to install the gable vent unless there's another way.

__________________
o2284200 is offline  
 
Reply With Quote Quick reply to this message
Old 06-13-2013, 01:55 PM  
nealtw
Senior Member
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 9,006
Liked 690 Times on 617 Posts
Likes Given: 1211

Default

I am saying, do not put in a gable vent...
In this photo we can see light over the block wall, so the attic is not a closed cavity and one vent in each side like you already have will do the job.
If the gap between the wall and the roof sheeting is more than 1 1/2" it will work fine and you haven't weekend the structure.
Try to get gable vent out of your head and go back and read my earlier posts

soffitslowersouthroof.jpg  
__________________
nealtw is offline  
 
Reply With Quote Quick reply to this message
Old 06-14-2013, 10:33 AM  
o2284200
Member
 
Join Date: Oct 2012
Location: , South Florida
Posts: 92
Liked 4 Times on 3 Posts

Default

I see...makes sense, THANKS!

__________________
o2284200 is offline  
nealtw Likes This 
Reply With Quote Quick reply to this message
Old 06-14-2013, 03:58 PM  
WindowsonWashington
Junior Member
 
WindowsonWashington's Avatar
 
Join Date: May 2013
Location: Washington, DC, Virginia
Posts: 198
Liked 19 Times on 18 Posts
Likes Given: 28

Default

Why not vent near the intersecting wall and via the soffits?

That will give you the best circulation and pull.

They make vents for over shingles.

Google DCI products



__________________
WindowsonWashington is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Gable roof extended for porch? DIYguy12 Framing and Foundation 3 04-04-2012 02:19 PM
New Gable Patio Roof DIYguy12 Framing and Foundation 3 02-01-2011 08:45 AM
Switch from floor vents in slab to ceiling vents in attic? cubfan23 HVAC 1 07-21-2009 07:01 AM
gable-end access to attic jingle Carpentry and Woodworking 2 10-23-2007 11:22 PM