Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Roofing/Siding

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-28-2009, 10:56 AM   #1
Newbie
 
Join Date: Sep 2009
Posts: 7
Rewards Points: 10
Default

Follow Up: Problems with Cobra III Ridge Vent


These are a few pics of our brand new ridge vents during a rain this weekend. The vents are dry (no condensation at all) when it is not raining. Does this look like an installation problem or could it be a negative pressure issue (bringing the outside weather inside). This weekend, we left the attic fan off during the rain (it also has a problem it seems...water splashing off the deck and coming in through the screening). This attic space was originally vented with three gable vents and an attic fan. Only since the new roof was installed, are we getting moisture. And specifically, the moisture is accumulating on the new ridge vents and new fan.
Thanks for anyone's comments.
Attached Thumbnails
Follow Up:  Problems with Cobra III Ridge Vent-ridge-vent-iii.jpg   Follow Up:  Problems with Cobra III Ridge Vent-leaking-ridge-vent-ii.jpg   Follow Up:  Problems with Cobra III Ridge Vent-leaking-ridge-vent.jpg  

GADad is offline   Reply With Quote
Old 09-28-2009, 11:23 AM   #2
Commercial Roofing
 
AaronB's Avatar
 
Join Date: Jan 2005
Location: Illinois
Posts: 927
Rewards Points: 500
Default

Follow Up: Problems with Cobra III Ridge Vent


If you're using ridge vent AND attic fans, this is a big no-no. Likely to be pulling outside air in through the ridge vent via the attic fan. Roofer should have known better than to mix the two.

__________________
www.roseroofing.net/ Free inspection within 12 miles
Seamless Polyurea Roofing Membranes for Metal Roofing, Roof Leak Repair, Seamless Commercial Spray Foam Insulation, Seamless Commercial Roofing, SPF Roofing, Industrial Insulation, Our trucks are red but our roofing is GREEN!
AaronB is offline   Reply With Quote
Old 09-28-2009, 11:37 AM   #3
Newbie
 
Join Date: Sep 2009
Posts: 7
Rewards Points: 10
Default

Follow Up: Problems with Cobra III Ridge Vent


We did not have the fan running when this rain event occurred. And still, you can see the amount of water that built up on the vents. Would that mean that they are installed improperly?
GADad is offline   Reply With Quote
Old 09-28-2009, 11:55 AM   #4
Residential Roofer
 
Slyfox's Avatar
 
Join Date: Jun 2008
Location: Struthers, Ohio
Posts: 803
Rewards Points: 500
Default

Follow Up: Problems with Cobra III Ridge Vent


Even when your power vent is not running it is still open and allowing air flow in or out.
That much water in the ridge vent is most likely a wind driven situation,
it happens with all types of exhaust vents. If the vent was installed properly the amount of water getting in will be minimal to the point of doing no harm.
In my experience I would say the amount of wetness showing in your pictures is high and I would check to make sure the ridge vent is fastened properly and has a proper amount of ridge cap overhang.
__________________
God Family Country Work Play
Facebook <> Twitter
Slyfox Exteriors Co.
Slyfox is offline   Reply With Quote
Old 09-28-2009, 12:11 PM   #5
Newbie
 
Join Date: Sep 2009
Posts: 7
Rewards Points: 10
Default

Follow Up: Problems with Cobra III Ridge Vent


The roofer recommended the attic fan for one half of the attic. This particular side is very steep and apparently doesn't have a long enough ridge to accomodate a working ridge vent. Unfortunately, what we discovered after the installation was that the roofers actually cut open the short run of ridge on the same side of the attic as the fan. Now they are saying that they can just close it up. (We are a little concerned with how they plan to do that so that we don't have future problems. They said it is not a big deal; that they will install ridge cap shingles and place another piece of ridge vent on top for asthetic purposes (which is what they were supposed to do in the beginning).

There is a plywood partition wall between the two sides of the attic. The other side of the attic has the longer section of ridge vent. (We do also have a large gable vent on the same side that they said would not be a problem.) The roofer originally indicated that there would be no problem utilizing ridge vent for ventilation on that half of the attic ...while using the venilator fan on the other side.

Now we are thinking that maybe we should just have them close up all of the ridge vent and go back to just merely using the gable vents and the new fan. ??
GADad is offline   Reply With Quote
Old 09-28-2009, 12:24 PM   #6
Commercial Roofing
 
AaronB's Avatar
 
Join Date: Jan 2005
Location: Illinois
Posts: 927
Rewards Points: 500
Default

Follow Up: Problems with Cobra III Ridge Vent


One or the other.

I have never seen a situation whereas the roof was too steep for ridge vent. A steeper pitch means faster hot air rise and vent.
__________________
www.roseroofing.net/ Free inspection within 12 miles
Seamless Polyurea Roofing Membranes for Metal Roofing, Roof Leak Repair, Seamless Commercial Spray Foam Insulation, Seamless Commercial Roofing, SPF Roofing, Industrial Insulation, Our trucks are red but our roofing is GREEN!
AaronB is offline   Reply With Quote
Old 09-28-2009, 05:57 PM   #7
Residential Roofer
 
Slyfox's Avatar
 
Join Date: Jun 2008
Location: Struthers, Ohio
Posts: 803
Rewards Points: 500
Default

Follow Up: Problems with Cobra III Ridge Vent


8/12 was the steepest for the exposed metal ridge vents, but I have not used any cap over styles that have a limit on steepness.

Power/Solar Fans work,
Box vents work,
Ridge vent works the best.

Take some pictures of the ridge vent "exterior" and maybe we can spot a problem in the installation. Take the picture with the power vent viewable as well if possible.
__________________
God Family Country Work Play
Facebook <> Twitter
Slyfox Exteriors Co.
Slyfox is offline   Reply With Quote
Old 09-28-2009, 07:22 PM   #8
Remodeling Contractor
 
oldfrt's Avatar
 
Join Date: Oct 2007
Location: Northwest Ct.
Posts: 224
Rewards Points: 150
Default

Follow Up: Problems with Cobra III Ridge Vent


From what I can try and see,it looks as though the vent holes may be cut improperly.

In the first pic it looks like the there is a strip of plywood just to the right of the ridge and then a cut section of decking for venting.
On the second picture,it looks like the vent cut in the plywood is too wide.
This would mean that the ridge vent doesn't overhang the shingles enough and your getting splash in from the rain.

Typically,the decking is cut 1" from each side of ridge and the ridge vent would overlap the shingles by about 3".
oldfrt is offline   Reply With Quote
Old 09-28-2009, 09:32 PM   #9
Newbie
 
Join Date: Sep 2009
Posts: 7
Rewards Points: 10
Default

Follow Up: Problems with Cobra III Ridge Vent


That is what we were thinking...that the opening is too big. Now what? Is it safe for them to just close them up and utilize the original ventilation (gable vents and attic fan)? What is the appropriate method of closing the ridge vents?

GADad is offline   Reply With Quote
Reply


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 Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cobra ridge vent problems dharris008 Roofing/Siding 24 04-30-2011 12:29 AM
Cobra Ridge Vent cougar01 Roofing/Siding 15 04-04-2011 04:21 PM
Hip caps to ridge vent KEITHnhia Roofing/Siding 1 07-04-2009 02:17 PM
Which is a better ridge vent? Cobra or Owens Corning Mikero Roofing/Siding 2 06-16-2009 05:51 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.