Ridge Vent - Roofing - Contractor Talk

Ridge Vent

 
Thread Tools Search this Thread Display Modes
Old 10-24-2011, 08:00 AM   #1
Pro
 
enforcer's Avatar
 
Trade: windows-siding
Join Date: Aug 2008
Posts: 658
Rewards Points: 500

Ridge Vent


i am having my roof done. Can a ridge vent cause my home to be colder in winter? Let's say I don't have a lot of insulation in my attic, will a ridge vent not only make my attic colder but the downstairs living area as well?
Final question... Obviously a ridge vent keeps the interior roof colder and prevents melting. Eventually it has to melt, will that cause damning or is the whole roof melting at the same time which prevents the ice damn?
enforcer is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   

Advertisement

 

Old 10-24-2011, 05:25 PM   #2
Pro
 
Randy Bush's Avatar
 
Trade: Exterior Remodeling
Join Date: Mar 2011
Location: Great Falls, MT
Posts: 5,504
Rewards Points: 1,430

Re: Ridge Vent


If not having a ridge vent is keeping your house warmer , I do think you have problems, more insulation needed. I did a house with a steel roof a number of years ago and the guy swore up and down I made his house colder. Which in fact I probably did. After looking in the attic there was barely enough insulation to cover the 2x4 ceiling. Made me spray foam in the roof edges ribs before I could collect on the job.
He was the type that was over educated.
I do believe a proper vent and insulated roof will be cooler in the summer there by the shingles lasting longer and keep the heat away from the roof in the winter there by less ice damming.
IMO I would not leave the ridge vent off.

Advertisement

Randy Bush is online now  
Old 10-24-2011, 05:41 PM   #3
Pro
 
GettingBy's Avatar
 
Trade: Home Improvement/handyman
Join Date: Aug 2010
Location: DC area
Posts: 2,622
Rewards Points: 6,486

Re: Ridge Vent


Quote:
Originally Posted by enforcer View Post
is the whole roof melting at the same time which prevents the ice damn?
Yes. Freezing at the roof edges and melting in the other areas due to attic heat causes ice dams.

I wired up my attic fan so I could turn it on in the winter to prevent ice dams. In principle it would work but practically it's hard to tell unless you run the fan all the time and everyone else is having dams and you aren't.
GettingBy is offline  
Sponsored Links
Advertisement
 
Old 10-24-2011, 05:41 PM   #4
General Contractor
 
greg24k's Avatar
 
Trade: New Home Construction-Additions-Remodeling
Join Date: May 2007
Location: NJ
Posts: 7,586
Rewards Points: 8,310

Re: Ridge Vent


Quote:
Originally Posted by enforcer View Post
i am having my roof done. Can a ridge vent cause my home to be colder in winter? Let's say I don't have a lot of insulation in my attic, will a ridge vent not only make my attic colder but the downstairs living area as well?
Final question... Obviously a ridge vent keeps the interior roof colder and prevents melting. Eventually it has to melt, will that cause damning or is the whole roof melting at the same time which prevents the ice damn?
What attic ventilation you have now? Do you have gable vents with a vented soffit, or just gable vents?
__________________
I never lost a cent on the jobs I didn't get!
greg24k is offline  
Old 10-24-2011, 08:04 PM   #5
Pro
 
enforcer's Avatar
 
Trade: windows-siding
Join Date: Aug 2008
Posts: 658
Rewards Points: 500

Re: Ridge Vent


I have gable vents and soffits. My roofer will close up the gable vents, make sure the soffits are functioning, and then install the ridge vent.
What I am still confused about is this.. The ridge vent will make the roof cooler thereby reducing melting from the ridge. However, the snow has to eventually melt right? Won't that in itself cause damning? Or is it that the whole roof melts together with a ridge vent including the eaves so there is no snow at the edges to damn?
enforcer is offline  
Old 10-24-2011, 08:33 PM   #6
General Contractor
 
greg24k's Avatar
 
Trade: New Home Construction-Additions-Remodeling
Join Date: May 2007
Location: NJ
Posts: 7,586
Rewards Points: 8,310

Re: Ridge Vent


Quote:
Originally Posted by enforcer View Post
I have gable vents and soffits. My roofer will close up the gable vents, make sure the soffits are functioning, and then install the ridge vent.
What I am still confused about is this.. The ridge vent will make the roof cooler thereby reducing melting from the ridge. However, the snow has to eventually melt right? Won't that in itself cause damning? Or is it that the whole roof melts together with a ridge vent including the eaves so there is no snow at the edges to damn?
You will be fine, ridge and soffit is the best attic ventilation you can get... To avoid ice dam, make sure no warm air or humidity escapes from the house into the attic. Make sure you have good ceiling insulation that will reduce heat loss by conduction.
__________________
I never lost a cent on the jobs I didn't get!
greg24k is offline  
Old 10-24-2011, 08:46 PM   #7
Pro
 
MJW's Avatar
 
Trade: General Contractor, Roofing, siding, windows
Join Date: Jan 2006
Location: MN
Posts: 1,934
Rewards Points: 1,772

Re: Ridge Vent


Quote:
Originally Posted by enforcer View Post
I have gable vents and soffits. My roofer will close up the gable vents, make sure the soffits are functioning, and then install the ridge vent.
What I am still confused about is this.. The ridge vent will make the roof cooler thereby reducing melting from the ridge. However, the snow has to eventually melt right? Won't that in itself cause damning? Or is it that the whole roof melts together with a ridge vent including the eaves so there is no snow at the edges to damn?
No matter what you do, there will be heat loss into the attic from the conditioned space below.

There is a possibility of the warm air melting the snow on top of the ridge vent, and the water flowing under the snow and creating an ice dam. The snow will act like an insulator and there could be water under it turning into ice when it cools.

This is usually only when it is a year with high snow totals and low temps. Make sure to keep the venting clear, especially if you notice it covered in snow or has formation of ice.

I have seen this on many houses and it rarely causes problems because it only happens for a short length of time. Last year, we had plenty of snow and did a lot of snow removal. Skylights, bathroom and range vents can and will do the same in these deep snow, low temp winters.

Never hurts to add insulation and save some of your heat and cooling.

Make sure those gable vents are closed and the soffit vents are functional.
MJW is offline  
Old 10-24-2011, 11:53 PM   #8
Member
 
Splinter hands's Avatar
 
Trade: GC
Join Date: Aug 2011
Location: Minnesota
Posts: 1,021
Rewards Points: 500

Re: Ridge Vent


The idea of venting is to keep the attic space at the same temp as the outside. How an ice dam usually forms is the attic space is above freezing which melts snow from the underside and when it gets to the eave it will freeze because the 1' or 2' that is on the outside of the interior wall is below freezing. When it freezes it gets bigger and bigger due to blocking the snow that is continually melting over the surface of the roof. At some point it will work it's way under the shingles melt again when it come in contact with the warmer sheathing and end up on your kitchen table. In short you NEED the vent.
Splinter hands is offline  
Old 10-25-2011, 07:04 AM   #9
Carbon Dioxide Producer
 
DuMass's Avatar
 
Trade: EC
Join Date: Feb 2008
Location: MA
Posts: 782
Rewards Points: 500

Re: Ridge Vent


I thought all the asphalt shingle manufacturers were requiring ridge and soffit venting to be installed in order for their 30 and 40-year architectural grade shingle "warranties" to be in effect?
Maybe not.
DuMass is offline  
Old 10-25-2011, 07:52 AM   #10
Pro
 
BamBamm5144's Avatar
 
Trade: Everything Exterior, Mostly Roofing.
Join Date: Jul 2008
Location: Wisconsin
Posts: 7,181
Rewards Points: 2,786

Re: Ridge Vent


Quote:
Originally Posted by DuMass
I thought all the asphalt shingle manufacturers were requiring ridge and soffit venting to be installed in order for their 30 and 40-year architectural grade shingle "warranties" to be in effect?
Maybe not.
Nope. You just need the proper amount of exhaust and intake. Majority of roofs don't have that and that's why 9 out of 10 roof warranties invalid.
BamBamm5144 is offline  
The Following User Says Thank You to BamBamm5144 For This Useful Post:
DuMass (10-25-2011)
Old 10-25-2011, 09:00 AM   #11
Pro
 
GettingBy's Avatar
 
Trade: Home Improvement/handyman
Join Date: Aug 2010
Location: DC area
Posts: 2,622
Rewards Points: 6,486

Re: Ridge Vent


Quote:
Originally Posted by enforcer View Post
However, the snow has to eventually melt right?
It can go directly from solid to vapor.
http://www.google.com/search?client=...UTF-8&oe=UTF-8
GettingBy is offline  
Old 10-25-2011, 02:23 PM   #12
Pro
 
welterweight's Avatar
 
Trade: sales
Join Date: Nov 2009
Posts: 556
Rewards Points: 500

Re: Ridge Vent


By installing a ridge vent, you will decrease ice damns because as you said, the ridge won't melt before the eaves and there will be no snow at the eaves to damn..The temp will be the same throughout opposed to the eaves being much colder than the ridge.

Last edited by welterweight; 10-25-2011 at 02:25 PM.
welterweight is offline  
Old 10-26-2011, 01:18 AM   #13
Member
 
Splinter hands's Avatar
 
Trade: GC
Join Date: Aug 2011
Location: Minnesota
Posts: 1,021
Rewards Points: 500

Re: Ridge Vent


Quote:
Originally Posted by welterweight View Post
By installing a ridge vent, you will decrease ice dams because as you said, the ridge won't melt before the eaves and there will be no snow at the eaves to damn..The temp will be the same throughout opposed to the eaves being much colder than the ridge.

Kinda. The idea is to try to keep the entire attic area the same temp as the eaves, not just at the ridge. There is still going to be snow at the eaves if there is snow on the roof.
Splinter hands is offline  
Old 10-26-2011, 01:20 AM   #14
Member
 
Splinter hands's Avatar
 
Trade: GC
Join Date: Aug 2011
Location: Minnesota
Posts: 1,021
Rewards Points: 500

Re: Ridge Vent


Quote:
Originally Posted by GettingBy View Post
It can go directly from solid to vapor.
http://www.google.com/search?client=...UTF-8&oe=UTF-8
Freeze dry.
Splinter hands is offline  
Old 10-26-2011, 06:28 AM   #15
Pro
 
enforcer's Avatar
 
Trade: windows-siding
Join Date: Aug 2008
Posts: 658
Rewards Points: 500

Re: Ridge Vent


Ok..so keep the whole roof the same temp as eaves.. if there can stll be snow on the eaves, there will be snow everywhere else? Or just not neatly as much therefore reducingnthe amount of meltbat the ridge?
enforcer is offline  
Old 10-26-2011, 07:04 AM   #16
Pro
 
jmiller's Avatar
 
Trade: Roofing
Join Date: May 2010
Location: Indianapolis
Posts: 1,712
Rewards Points: 1,002

Re: Ridge Vent


Quote:
Originally Posted by enforcer View Post
Ok..so keep the whole roof the same temp as eaves..
Via ventilation AND insulation. You haven't mentioned how well the attic is insulated. Pay special attention to the area over the top plate on exterior walls, which is especially hard to insulate if you have a ranch. You need baffles there, at least at the soffit vents*, so you can get the most insulation possible without restricting air flow.

Most ice dams we looked at last year were due to poor insulation near recessed lights, at uninsulated attic hatches, bathroom exhausts vented into the attic, etc.

*Ideally you'd have continuous soffit vents if you're switching to ridge vent. An imbalance exhaust/intake can pull conditioned air from the living space, so technically yes- it could make the house colder in winter.
jmiller is offline  
Old 10-27-2011, 06:35 PM   #17
Registered User
 
Lavezzo Const's Avatar
 
Trade: General Contractor
Join Date: Oct 2011
Location: Charlottesville, VA
Posts: 5
Rewards Points: 10

Re: Ridge Vent


Adding a ridge vent will make the attic colder in the winter, especially on a metal roof. But with proper insulation, there should be no problems. Its better to add the ridge vent then have none at all. Cuts down on humidity

http://www.lavezzoconstruction.com
Lavezzo Const is offline  
Old 10-27-2011, 06:58 PM   #18
Pro
 
Tom Struble's Avatar
 
Trade: siding
Join Date: Mar 2007
Location: west milford n.j.
Posts: 17,271
Rewards Points: 20

Re: Ridge Vent


colder in the winter? whoda thunk
__________________
Tom
Tom Struble is offline  
Old 10-27-2011, 11:24 PM   #19
Member
 
Splinter hands's Avatar
 
Trade: GC
Join Date: Aug 2011
Location: Minnesota
Posts: 1,021
Rewards Points: 500

Re: Ridge Vent


Quote:
Originally Posted by enforcer View Post
Ok..so keep the whole roof the same temp as eaves.. if there can stll be snow on the eaves, there will be snow everywhere else? Or just not neatly as much therefore reducingnthe amount of meltbat the ridge?

Yes that is what you are trying to do. Keep the entire roof the same temp. Also in the summer you want to be able to cool off the attic space, soffit vents and a ridge vent let cooler air in through the soffitt and the hot air out through the ridge.
Splinter hands is offline  
Old 10-28-2011, 11:46 AM   #20
Pro
 
larryb's Avatar
 
Trade: Retail and insurance repair claims consultant
Join Date: May 2008
Location: Minneapolis, Minnesota USA
Posts: 383
Rewards Points: 258

Re: Ridge Vent


Proper soffit ventilation with chutes and ridge vent - then make sure your insulation is sufficient.

Advertisement

__________________
3RSystems, LLC - Storm Damage Contractor Insurance Claim Sales and Process Training, Hail Reports, and loss report analysis.
larryb is offline  


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
seal gable vents after ridge vent installed? tacoma5050 Roofing 41 06-07-2012 07:32 PM
Ridge Vent issue--- enforcer Roofing 5 04-27-2011 10:16 AM
Ridge Vent for Steep Roof MSBOY General Discussion 4 03-24-2010 09:30 AM
Ridge vent code for fire break? goneelkn Roofing 1 02-14-2010 05:41 PM
ridge vent boman47k Roofing 15 05-12-2009 08:06 AM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?