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Does my roof need ridge vents? #4945481
12/06/18 09:32 PM
12/06/18 09:32 PM
Joined: Apr 2013
Posts: 5,979
FL, USA
gregk24 Offline OP
gregk24  Offline OP

Joined: Apr 2013
Posts: 5,979
FL, USA
We have a 1959 ranch house that has gable vents on either side, as well as soffit vents all around. We are looking at getting it re-shingled the beginning of next year. Are ridge vents necessary? We want the new roof to last as long as possible. The current roof is a 3 tab shingle roof going on 15 years old. The shingles themselves look good to me other than some nails sticking up in some spots, we also have a small leak when it rains heavily or for an extended period.

I figured with it being 15 years old and with the leak (and possible other leaks we don't see yet) it may be time to have a new one put on. Anyway, I got a quote to have it replaced. $6,350. This includes dimensional shingles, synthetic felt underlayment, new flashing, and clean up. I emailed the guy back to see if he would charge extra for ridge vents. Just wanted to see what the knowledgable BITOG crowd had to say.

Currently there are no ridge vents installed.


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Re: Does my roof need ridge vents? [Re: gregk24] #4945490
12/06/18 09:36 PM
12/06/18 09:36 PM
Joined: Jul 2005
Posts: 31,431
NY
demarpaint Offline
demarpaint  Offline

Joined: Jul 2005
Posts: 31,431
NY
Florida house. I'd get them, especially if you plan on redoing the roof. There is no better time to do it them when you're redoing the roof.


God Bless Our Troops

Re: Does my roof need ridge vents? [Re: gregk24] #4945491
12/06/18 09:37 PM
12/06/18 09:37 PM
Joined: Dec 2017
Posts: 1,546
US
JLTD Offline
JLTD  Offline

Joined: Dec 2017
Posts: 1,546
US
Ridge vents do a better job of what the gable vents and soffits do for you; probably will be an improvement.


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Re: Does my roof need ridge vents? [Re: gregk24] #4945492
12/06/18 09:38 PM
12/06/18 09:38 PM
Joined: Oct 2014
Posts: 13,013
Canyon County Idaho
CT8 Online content
CT8  Online Content

Joined: Oct 2014
Posts: 13,013
Canyon County Idaho
I put ridge vents on my last house and you could feel the heat venting out . I also doubled the eave vents. The roof had scoop vents as well. There are Florida approved vents on the market at the time I installed the vents maybe around 2006 .


2015 Ford F150 2.7
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Re: Does my roof need ridge vents? [Re: gregk24] #4945519
12/06/18 10:11 PM
12/06/18 10:11 PM
Joined: Dec 2017
Posts: 3,702
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline

Joined: Dec 2017
Posts: 3,702
SE British Columbia, Canada
I have ridge vents in my 6 year old house. No complaints. They have a mesh that theoretically keeps pests out.


If you want the job done right......do it yourself.
Re: Does my roof need ridge vents? [Re: gregk24] #4945521
12/06/18 10:13 PM
12/06/18 10:13 PM
Joined: Mar 2004
Posts: 21,580
Upstate NY
Donald Offline
Donald  Offline

Joined: Mar 2004
Posts: 21,580
Upstate NY
The cooling air needs to flow from the soffit vents up between roof rafters and out the ridge vents. Cathedral ceiling is another story. The ridge vents are pretty easy for them to install. They cut the top 2" of plywood away on each side of the peak. The ridge vent goes there.


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Re: Does my roof need ridge vents? [Re: gregk24] #4945525
12/06/18 10:20 PM
12/06/18 10:20 PM
Joined: Jul 2013
Posts: 1,860
Ottumwa, Iowa
jhellwig Offline
jhellwig  Offline

Joined: Jul 2013
Posts: 1,860
Ottumwa, Iowa
It depends on the pitch of the roof and which way the rain drives from also. I removed my ridge vent because it isn’t needed due to there being no air space to vent and it leaked when it rained with a little wind. My house is a ranch with a relatively low pitch but still enough to shingle.

I would say the ridge vent is more for looks than functional. It is basically thick corrugated plastic with the air moving through the corrigations. Adding more regular vents would be a more effective way to move more air.


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Re: Does my roof need ridge vents? [Re: jhellwig] #4945562
12/06/18 11:18 PM
12/06/18 11:18 PM
Joined: Aug 2013
Posts: 2,976
Central Maryland
HangFire Offline
HangFire  Offline

Joined: Aug 2013
Posts: 2,976
Central Maryland
Originally Posted by jhellwig
It depends on the pitch of the roof and which way the rain drives from also.


This. All ridge vents allow in a little rain. You live in Florida. You have hurricanes there. We don't know the pitch of your roof or the prevailing winds.

I would get opinions from neighbors, as well as your contractor.


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Re: Does my roof need ridge vents? [Re: gregk24] #4945571
12/06/18 11:38 PM
12/06/18 11:38 PM
Joined: Sep 2010
Posts: 8,022
Texas
4WD Offline
4WD  Offline

Joined: Sep 2010
Posts: 8,022
Texas
Put them on first in 1996 (plugged old turbine holes) and then replaced that roof in 2015 - and since the slots were already there we put new ridge vents exactly where they were before. Never leaked a drop and we get some bad thunderstorms and tropical storm effects Also doubled in the intake and got all that re trimmed ... After that ... went up and stapled astro foil (double bubble and double foil) to my rafters stopping about six inches from the ends of the 2x6"s ... about 10% better on electric bills after that ...

Re: Does my roof need ridge vents? [Re: JLTD] #4945651
12/07/18 05:48 AM
12/07/18 05:48 AM
Joined: Nov 2008
Posts: 3,448
Oshawa, Ontario Canada
JC1 Online content
JC1  Online Content

Joined: Nov 2008
Posts: 3,448
Oshawa, Ontario Canada
Originally Posted by JLTD
Ridge vents do a better job of what the gable vents and soffits do for you; probably will be an improvement.


+1. I re-shinglwd half of my roof and added ridge vents to the two peaks that had the old style vent. Better ventilation in the summer for sure.

They will probably want to charge you some inflated cost, but they are worth it.


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Re: Does my roof need ridge vents? [Re: gregk24] #4945675
12/07/18 06:43 AM
12/07/18 06:43 AM
Joined: Jan 2011
Posts: 3,422
PV Az @ 5000'
AZjeff Offline
AZjeff  Offline

Joined: Jan 2011
Posts: 3,422
PV Az @ 5000'
Very few houses will not benefit from ridge vents. Do some research and see what the industry says about ridge vents. You need adequate soffit vents to allow either gable or ridge vents to work properly. The object is for the attic temp to be the same as air temp and to vent out excess moisture. If you have bathroom exhaust fans make sure they vent to outside and not into the attic space as well.


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Re: Does my roof need ridge vents? [Re: gregk24] #4945681
12/07/18 06:54 AM
12/07/18 06:54 AM
Joined: Apr 2010
Posts: 2,666
Atlanta,GA
BMWTurboDzl Offline
BMWTurboDzl  Offline

Joined: Apr 2010
Posts: 2,666
Atlanta,GA

"Where the air leaves isn’t as important — whether it’s a ridge vent, or mushroom caps, or gables. What’s important is that you have continuous air entry at the perimeter of the roof down low."

-Joe Lstiburek, Building Science Corp

He is one of the premier building science experts in North America.

https://buildingscience.com/documents/digests/bsd-102-understanding-attic-ventilation
https://www.greenbuildingadvisor.com/article/lstibureks-rules-for-venting-roofs


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Re: Does my roof need ridge vents? [Re: gregk24] #4945686
12/07/18 07:11 AM
12/07/18 07:11 AM
Joined: Jun 2015
Posts: 4,739
New England
Virtus_Probi Offline
Virtus_Probi  Offline

Joined: Jun 2015
Posts: 4,739
New England
I do have a mild warning about ridge vents if you go with them...we just had our roof done and the shingles above the vents looked much worse than the rest of the roof.
Our contractor told us it was very common in our area when our house was built to use an inferior product above the ridge vents, I guess there was something on the market that was cheap and readily available...so some people would end up needing work on the ridge vents done well before the rest of the roof needed attention. He said that people typically had a 10-15 year product on the ridge vents but 20-30 year shingles everywhere else.
He assured us that the replacement shingles on our whole house would all be of the same quality, my wife handled most of it but I think we have a "lifetime" warranty (I'd assume that's as long as we own the house and not as long as the structure stands). I guess it looks to me from a distance like shingles are bent over the top of the ridge vent, but it seemed like the contractor was saying the product comes as a unit with the shingles already attached. Our roof is steep enough that I don't care to get up there and take a close look....except for our nightmare sunroom roof that is way too shallow because he hired an inferior contractor for that. The latest roofer told me his crew made some improvements that should prevent some of the water issues we had when than room was new and we had heavy snow, and I didn't run a wire on the surface like I had up there for many years...but I wouldn't be surprised if I am up there shoveling that roof this winter like I have done a couple dozen of times over the years and running a wire next year.


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Re: Does my roof need ridge vents? [Re: gregk24] #4945698
12/07/18 07:33 AM
12/07/18 07:33 AM
Joined: Dec 2002
Posts: 1,631
North Carolina
Rat407 Offline
Rat407  Offline

Joined: Dec 2002
Posts: 1,631
North Carolina
We put ridge vents on our house and it made a difference. We also get hurricanes here in eastern NC and no issues with rain coming in. Especially after hurricane Florence. It rained for three days straight, flooding everywhere but the attic was dry as was our separate garage and my 25'x40' shed. All have ridge vents.

I did open up my sofet vents all the way around the house as to get good air flow.


2002 Silverado 5.3 0w-20 AMSOIL
Re: Does my roof need ridge vents? [Re: jhellwig] #4945700
12/07/18 07:37 AM
12/07/18 07:37 AM
Joined: Sep 2007
Posts: 413
northern NY
Driz Offline
Driz  Offline

Joined: Sep 2007
Posts: 413
northern NY
They came on our 95 modular, surely builders 🤨quality and I won’t brag on them. Yea they work but last year we found a few soft spots along the length this past summer. Offhand I’d say the cracked sealant let the water in.
I’d [censored] well be sure to paint the edges and especially the end grain of the cutout before they go on. Make sure you get a set that’s high quality and recommended. Use high quality sealant when they go in and dont scrimp on it. Then keep an eye on it for hardening and deterioration then scrape and reseal when needed down the road. Pay special attention to where they lap together as ours particularly leaked in there from sealant deterioration. They’ll let the heat out nicely but water too in if you don’t watch them.

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