HOT Attic, Ridge Vent/soffit Vent Questions - Roofing/Siding - DIY Home Improvement | DIYChatroom


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

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

Reply
 
Thread Tools Display Modes
Old 01-06-2008, 11:15 PM   #16
Member
 
the roofing god's Avatar
 
Join Date: Aug 2007
Location: Pomona,New York,10970
Posts: 877
Rewards Points: 500
Send a message via MSN to the roofing god
Default

HOT attic, ridge vent/soffit vent questions


let me explain for you ED,WHEN SOFFIT IS INSTALLED ,the sider puts a level at the bottom of the fasciaand marks the corresponding level point on the house wall,the j-channel is installed on the house wall,and the soffit panel goes onto the bottom of the fascia where it is secured,and in turn lapped over by the fascia cover.since the panels are cut shorter than the actual measurement to allow for proper expansion and contraction,this leaves a small space at both ends of the soffit panels.also when this is done properly,the soffit panels hang approximately 1-2 " below the existing wood soffit,which will as I said allow for plenty of breathing space,so if what you see is just the fascia cover without a j-channel showing,that`s how it was done like this;

Advertisement

__________________
"If it`s worth doing,It`s worth doing right!!"

www.ADVANCEDROOFINGNEWYORK.com
the roofing god is offline   Reply With Quote
Old 01-06-2008, 11:31 PM   #17
Member
 
the roofing god's Avatar
 
Join Date: Aug 2007
Location: Pomona,New York,10970
Posts: 877
Rewards Points: 500
Send a message via MSN to the roofing god
Default

HOT attic, ridge vent/soffit vent questions


when the gable vent is open near the ridge vent,it causes the pull from the ridge vent to go to the closest air source,ie;the gable vents--which is what Ed is telling you when he says short circuiting the vents-he`s right about that
__________________
"If it`s worth doing,It`s worth doing right!!"

www.ADVANCEDROOFINGNEWYORK.com
the roofing god is offline   Reply With Quote
Old 01-06-2008, 11:37 PM   #18
Member
 
Join Date: Jan 2007
Posts: 2,384
Rewards Points: 1,000
Default

HOT attic, ridge vent/soffit vent questions


Quote:
Originally Posted by ShortEdged View Post
Do these Gable Vents short circuit to the ridge vents causing soffit vents not to work effectively?

Yes in theory, they would. It also would depend on how much and where the intake ventilation is coming from.

Is this photo the same house as the aluminum soffit photos are from?

Additionally, there may be even more at play here, since the ridge lines of these lower roofs are lowere than the highest ridge line of the house.

Are the attic areas fluid from the lower roof attic sections to the main upper roof section?

If so, then even the placement of the ridge ventilation on the lower ridge lines may have been theoretically incorrect.

If there is proper intake ventilation in these lower roof section soffits, then the gable vents should be sealed off from the interior.

Now for TRG,

Fortunately for you, you install soffit and fascia in the correct manner. I still think your scenario would not allow a free flowing of air, but I could be wrong, depending on how many inches of space you have alloted for the soffit panels to be suspended below the wooden soffits. 1"-2"??? That would seem likely to allow them to to vibrate and chatter from the wind.

In the method you described, it would seem as if the panels are free floating between the channels.

Whenever I have had to tear off old soffit panels that needed repairs, it was more likely than not, that they were fastened directly to the wooden soffit with either a staple or brad nails in the v-crimp.

Ed
Ed the Roofer is offline   Reply With Quote
Old 01-06-2008, 11:50 PM   #19
Member
 
the roofing god's Avatar
 
Join Date: Aug 2007
Location: Pomona,New York,10970
Posts: 877
Rewards Points: 500
Send a message via MSN to the roofing god
Default

HOT attic, ridge vent/soffit vent questions


Ed,soffit j has a 1"lip,if it was that way you would see it in this picture,when you level it the space between the bottom of the fascia and the old wood soffit remains constant,so yes at least 1"of space,and when soffit is cut you take the exact measurement and subtract 1" to allow for expansion/contraction,and as for the pic,if they did what you`re used to,you would see the j channel because it would butt against the fascia,and definitely be visible past that 3/4"bottom bend os the fascia cover

__________________
"If it`s worth doing,It`s worth doing right!!"

www.ADVANCEDROOFINGNEWYORK.com
the roofing god is offline   Reply With Quote
Old 01-06-2008, 11:55 PM   #20
Member
 
Join Date: Dec 2007
Posts: 49
Rewards Points: 31
Default

HOT attic, ridge vent/soffit vent questions


Quote:
Originally Posted by Ed the Roofer View Post
Is this photo the same house as the aluminum soffit photos are from?
No, this house has soffit vents about every three feet. No siding.
Quote:
Originally Posted by Ed the Roofer View Post
Are the attic areas fluid from the lower roof attic sections to the main upper roof section?
Yes
Quote:
Originally Posted by Ed the Roofer View Post
If there is proper intake ventilation in these lower roof section soffits, then the gable vents should be sealed off from the interior.
That is why this thread caught my attention. I had a few roof contractors say seal the gable vents and others say that was great to have them for the extra ventilation. None said anything about the multi level ridge vent. Did have one who said seal the ridge vents and use twirly birds instead.

I almost sealed the gable vents up until another contractor said don’t.

Is there a simple test to do to see if there is a ventilation problem? I read HOT attic and that seems so subjective. What is to hot? 20,30,40 deg hotter than outside. Where I’m located it can get 110’s.
ShortEdged is offline   Reply With Quote
Old 01-07-2008, 12:02 AM   #21
Member
 
the roofing god's Avatar
 
Join Date: Aug 2007
Location: Pomona,New York,10970
Posts: 877
Rewards Points: 500
Send a message via MSN to the roofing god
Default

HOT attic, ridge vent/soffit vent questions


don`t put turbines unless you want leak issues IMO---AND YOU NEED A BETTER PIC OF THAT ROOF SHOWING THE HEIGHT OF THOSE A`S,SINCE HEY MAY NOT BE CONNECTED TO THE MAIN ATTIC,if it`s a small rise,sometimes they frame and sheathe the main area 1st,and then mount those onto the roof sheathing--definitely close the gable vents
__________________
"If it`s worth doing,It`s worth doing right!!"

www.ADVANCEDROOFINGNEWYORK.com
the roofing god is offline   Reply With Quote
Old 01-07-2008, 12:09 AM   #22
Member
 
Join Date: Dec 2007
Posts: 49
Rewards Points: 31
Default

HOT attic, ridge vent/soffit vent questions


Quote:
Originally Posted by the roofing god View Post
THE HEIGHT OF THOSE A`S,SINCE HEY MAY NOT BE CONNECTED TO THE MAIN ATTIC,if it`s a small rise,sometimes they frame and sheathe the main area 1st,and then mount those onto the roof sheathing--definitely close the gable vents
The gables areas are all the same area and connected. The gables were there before there was a ridge vent. Ridge vents were put there after a tear off and re-shingled. And yes, they are very close to the lower level ridge vents. Now, how can you test to see if this creates an issue?
ShortEdged is offline   Reply With Quote
Old 01-07-2008, 12:41 AM   #23
Member
 
Join Date: Jan 2007
Posts: 2,384
Rewards Points: 1,000
Default

HOT attic, ridge vent/soffit vent questions


Mixed elevation ridge lines with inter-connecting attic spaces create debate at the Ventilation Seminars.

I will read up on the most current studies and thought process, but from previous instructions and worldly advice, unless there is only a slight 1-3 foot dofferential in the ridge elevations, they would probably say to seal the gable vents and the ridge vents on the lower attic recesses and install a powered attic ventilator in that cavity and block off the path of attic where the 2 sections meet and exchange the same air.

That sounds like alot of expense and additional work for non-guaranteed results.

If it were my home, I would ensure that the soffit ventilation was 100% as efficient as possible, especially on those lower attic cavities and keep the ridge vent, but ensure that the slot cut out was properly wide enough for expedient air exhaust and close off the gable vents from the interior.

Proper ventilation will lower the interior temperatures from 20* to 40* depending on the other criteria. Black vs. white shingles and orientation to the direct rays of the sun in the horizon and internal heat and humidity conditions and the prevailing direction of the winds.

Even with the most proper ventilation, the attic will still remain warmer, but not passing out hot, than the ambient external air temperatures.

Ed

Last edited by Ed the Roofer; 01-07-2008 at 11:36 AM.
Ed the Roofer is offline   Reply With Quote
Old 01-07-2008, 06:45 AM   #24
Member
 
Join Date: Jan 2008
Location: Ontario
Posts: 49
Rewards Points: 25
Default

HOT attic, ridge vent/soffit vent questions


Quote:
Originally Posted by the roofing god View Post
don`t put turbines unless you want leak issues IMO
Leaks from where? If you install them right, with the right capping around the base like any other type of vent cap, there are no leaks.

roofing god, could you please elaborate on your comment as we would all benefit from your almighty wisdom.

Thanks!

Last edited by Educator; 01-07-2008 at 09:40 AM.
Educator is offline   Reply With Quote
Old 01-07-2008, 09:06 AM   #25
Member
 
Join Date: Aug 2007
Posts: 86
Rewards Points: 75
Default

HOT attic, ridge vent/soffit vent questions


In addition to proper venting, no one has mentioned radiant barriers... it was amazing how much heat it kept out of our attic last summer.

The radiant barrier, stapled to the bottom of the uppermost truss 2x4 (therefore 3.5 inches below our roof), served to also provide an airspace to keep our insulation away from the area above the outside walls.... we have extra insulation with advanced trusses. The air from the soffits is not blocked and can take the heat that is radiated up from the barrier up to the ridge vents. There is also a gap in the barrier just below the ridge vent to allow ventilation from the attic. It really works. Just google radiant barrier... lots of info out there.
leezarrd is offline   Reply With Quote
Old 01-07-2008, 01:59 PM   #26
Member
 
Join Date: Jan 2007
Posts: 2,384
Rewards Points: 1,000
Default

HOT attic, ridge vent/soffit vent questions


Here is the written response to the question about applying Ridge Vents on homes with multiple ridge line elevations, taken from Air Vent Corp., Ask The Expert Seminars, directed by Paul Scelsi.

It seems as if my previous response regarding the theory was right on the money.

Ed

How do I ventilate a roof with multiple ridge heights?

A “regular” at each seminar, we get this question almost more than any other. Our answer is that for multiple ridgelines, ridge vents are best because they are independent of wind direction. The basic rule for ridge heights states that all ridges can be vented whether they run parallel or at angles to each other. If, however, the ridges are more than 3 feet apart in height, one should only ventilate the higher one.


Here’s why: Recall how an externally baffled ridge vents works — as the wind passes over the baffle, it creates low static pressure, drawing air from the attic. The faster the wind moves over the baffle, the greater the pressure it creates, drawing more air from the attic. Typically, wind moves faster at higher elevations, therefore, the higher ridge will be exposed to higher wind speeds. If the wind speed difference is adequate, the pressure at the higher ridge may be enough to pull air through the lower ridge vent.
If the ridgelines are more than 3 feet apart in height, we recommend that you separate the attics with a piece of plywood or poly sheeting to create two distinct attics. Once this is done, you can ventilate both ridgelines with exhaust vents and balance them with intake vents.

Last edited by Ed the Roofer; 01-07-2008 at 11:41 PM.
Ed the Roofer is offline   Reply With Quote
Old 01-07-2008, 05:13 PM   #27
Member
 
Join Date: Dec 2007
Posts: 49
Rewards Points: 31
Default

HOT attic, ridge vent/soffit vent questions


Thanks Ed,
Sounds like I got my hands full. I will have to keep an eye on the venting. And to think, I thought I was covered with all the vents I had. I guess too much in the wrong place is just as bad as having none at all.
ShortEdged is offline   Reply With Quote
Old 01-07-2008, 07:04 PM   #28
Member
 
the roofing god's Avatar
 
Join Date: Aug 2007
Location: Pomona,New York,10970
Posts: 877
Rewards Points: 500
Send a message via MSN to the roofing god
Default

HOT attic, ridge vent/soffit vent questions


and we have cockiness rearing it`s ugly head w/this statement
"Leaks from where? If you install them right, with the right capping around the base like any other type of vent cap, there are no leaks.

roofing god, could you please elaborate on your comment as we would all benefit from your almighty wisdom.

Thanks!"
Last edited by Educator : Today at 09:40 AM.
iF THERE IS NO WIND SPINNING THEM,THEY WILL,AND HAVE LEAKED IN HEAVY DOWNPOURS OF RAIN-I have seen it many,many times
__________________
"If it`s worth doing,It`s worth doing right!!"

www.ADVANCEDROOFINGNEWYORK.com

Last edited by the roofing god; 01-07-2008 at 07:06 PM.
the roofing god is offline   Reply With Quote
Old 01-07-2008, 07:09 PM   #29
Member
 
the roofing god's Avatar
 
Join Date: Aug 2007
Location: Pomona,New York,10970
Posts: 877
Rewards Points: 500
Send a message via MSN to the roofing god
Default

HOT attic, ridge vent/soffit vent questions


just so you know,I don`t just talk about it,I do roofing.for 30 years now,so save the sarcasm for someone who appreciates it
__________________
"If it`s worth doing,It`s worth doing right!!"

www.ADVANCEDROOFINGNEWYORK.com
the roofing god is offline   Reply With Quote
Old 01-07-2008, 11:58 PM   #30
Member
 
Join Date: Jan 2007
Posts: 2,384
Rewards Points: 1,000
Default

HOT attic, ridge vent/soffit vent questions


Once again, I must strongly urge you to not use the turbine vents as Educator has suggested.

I know that they leak, not only from many studies I have read, but also from 29 years of actual hands on roofing experience.

Additionally, the ball bearings will eventually freeze up and the rotation will be non-existent, which would totally thwart any perceived wind driven benefit.

Ed

Advertisement

Ed the Roofer is offline   Reply With Quote
Reply


Thread Tools
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
is an attic vent required for cedar shingle roof? walenta Building & Construction 2 10-25-2007 11:31 AM
Useless Ridge Vent? itwerx2 Roofing/Siding 22 10-22-2007 10:57 PM
sofit vents + gable end vents no ridge vent mattg1970 Roofing/Siding 5 10-18-2007 10:47 AM
Ridge vent installation cost Douche Roofing/Siding 1 07-26-2006 05:59 AM
Ridge Vent - Low-pitched roof? brianp Roofing/Siding 2 05-08-2006 09:32 PM




Top of Page | View New Posts