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Ridge Vent Industry Question

 
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Old 09-26-2008, 05:57 PM   #1
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Ridge Vent Industry Question


I just did a roof, single ranch, and they decided they wanted ridge vent after i was all done(fun)! so i installed it. i then drove around and started noticing that every other house ran it differently. some houses ran it right to the end , some run it to about 3 ft from the end and ran cap to the end of thevent and left the vent exposed. ialso saw someone run it 3 ft from the end and run the cap over the end of the vent and continue to the end. which is the correct way to install that plastic vent?
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Old 09-26-2008, 06:10 PM   #2
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Re: Ridge Vent Industry Question


If in doubt - read the directions

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Old 09-26-2008, 06:23 PM   #3
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Re: Ridge Vent Industry Question


NEVER to the end.
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Old 09-26-2008, 06:28 PM   #4
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Re: Ridge Vent Industry Question


i usually run it about 1.5-2 feet from the end.
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Old 09-26-2008, 08:33 PM   #5
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Re: Ridge Vent Industry Question


Actually with most brands you run the vent to the end, and cap it or fold it over to seal the end. But you do not cut the slot in the roof to the end, you stop the cut about a foot back from the gable wall.

Other wise it looks stupid with that step up and down at the ends or that slope some guys make by running the ridge cap over the end, especially if it is one of the thicker ridge vents.
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Old 09-26-2008, 08:49 PM   #6
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Re: Ridge Vent Industry Question


Quote:
Originally Posted by Kgmz View Post
Actually with most brands you run the vent to the end, and cap it or fold it over to seal the end. But you do not cut the slot in the roof to the end, you stop the cut about a foot back from the gable wall.

Other wise it looks stupid with that step up and down at the ends or that slope some guys make by running the ridge cap over the end, especially if it is one of the thicker ridge vents.
What he said,looks way better
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Old 09-26-2008, 08:57 PM   #7
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Re: Ridge Vent Industry Question


Quote:
Originally Posted by Kgmz View Post
Actually with most brands you run the vent to the end, and cap it or fold it over to seal the end. But you do not cut the slot in the roof to the end, you stop the cut about a foot back from the gable wall.

Other wise it looks stupid with that step up and down at the ends or that slope some guys make by running the ridge cap over the end, especially if it is one of the thicker ridge vents.
What he said,looks way better
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Old 09-26-2008, 08:57 PM   #8
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Re: Ridge Vent Industry Question


I do not disagree with running the vent to the ends. Just not cutting.
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Old 09-26-2008, 10:46 PM   #9
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Re: Ridge Vent Industry Question


Quote:
Originally Posted by Kgmz View Post
Actually with most brands you run the vent to the end, and cap it or fold it over to seal the end. But you do not cut the slot in the roof to the end, you stop the cut about a foot back from the gable wall.

Other wise it looks stupid with that step up and down at the ends or that slope some guys make by running the ridge cap over the end, especially if it is one of the thicker ridge vents.
Thats how I train our guys to do it too.

Ed
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Old 09-27-2008, 08:52 AM   #10
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Re: Ridge Vent Industry Question


Always run your ridge vent continous. end to end. This is for esthetic reasons as well as manfactures instructions. It is the mark of a hack job and an uncaring unsymetricle roof to short change the lines of your roof. makes an otherwise neat job look like crap. "a pet peeve of mine".

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Old 09-27-2008, 03:09 PM   #11
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Re: Ridge Vent Industry Question


Quote:
Originally Posted by SLSTech View Post
If in doubt - read the directions
never! directions are over rated!
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Old 09-27-2008, 04:25 PM   #12
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Re: Ridge Vent Industry Question


I always run mine to the end but will put about 3-4 pieces of ridge cap under the vent on the ends. So it's not realy venting the last foot but looks a hell of alot better. By the way directions on amoni-roll say leave 12-16" from end.
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Old 09-27-2008, 08:59 PM   #13
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Re: Ridge Vent Industry Question


Always to the end. End is uncut and shingle tops overlap. Silly to put any cap under the vent.
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Old 09-27-2008, 09:08 PM   #14
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Re: Ridge Vent Industry Question


You can use ridge vent for more than ridges, if you don't have enough ridge to get the amount of air flow you need, and you don't want to ugly up the roof with box vents, use more ridge vents. Passive ventilation that works and gets all the air flow required for code is easily attainable.
Might require a little more work but I have found that the customer is willing to pay extra for something that will cost nothing to have in operation and save them money while it is operating 24/7. Ridge vents is the easiest to modify to attain that goal.http://www.contractortalk.com/pictur...&pictureid=167

Last edited by Roofsafe; 09-27-2008 at 09:11 PM.
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Old 09-27-2008, 09:15 PM   #15
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Re: Ridge Vent Industry Question


Hers' the link. I forgot to add it to my site. Just stuck the page up.

http://www.albertsroofing.com/Ridge%20Vent%20Detail.htm
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Old 09-27-2008, 09:43 PM   #16
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Re: Ridge Vent Industry Question


Cobra has advice on this on their website. Your air outflow should not be more than your air intake. It really depends on square footage of your roof.

Balanced Ventilation
Requirements
Balanced ventilation requires 1 square foot of ventilation
for every 300 square feet of attic floor space.
1.
Calculate the total square footage of the attic floor area
(round up to the next highest number). This number
will determine the minimum total linear feet of Cobra
Exhaust Vent that is needed.

2.
Find the appropriate amount of Cobra Exhaust Vent
and minimum intake ventilation that corresponds to
the total attic square footage.

Total Recommended Length Minimum Intake
Attic Square of Cobra Exhaust Vent Ventilation (Net Free
Footage (Feet)
* Area in Sq. In.)*

1600 23/28 389/395
1900 27/33 457/466
2200 32/38 541/536
2500 36/43 609/607
2800 40/48 676/677
3100 45/53 761/748
3400 49/58 829/818
*
First figure pertains to hand nail, second figure
pertains to nail gun
NOTE: In no case should the amount of ridge exhaust
ventilation exceed the amount of soffit ventilation.


With this being presented, the length that you install depends on personal taste and asthetics, also what is defined in your contract.
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Old 09-27-2008, 09:59 PM   #17
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Re: Ridge Vent Industry Question


Quote:
Originally Posted by wizendwizard View Post
Cobra has advice on this on their website. Your air outflow should not be more than your air intake. It really depends on square footage of your roof.

Balanced Ventilation
Requirements
Balanced ventilation requires 1 square foot of ventilation
for every 300 square feet of attic floor space.


1.
Calculate the total square footage of the attic floor area


(round up to the next highest number). This number
will determine the minimum total linear feet of Cobra
Exhaust Vent that is needed.
2.


Find the appropriate amount of Cobra Exhaust Vent


and minimum intake ventilation that corresponds to
the total attic square footage.



Total Recommended Length Minimum Intake
Attic Square of Cobra Exhaust Vent Ventilation (Net Free
Footage (Feet)


* Area in Sq. In.)*


1600 23/28 389/395
1900 27/33 457/466
2200 32/38 541/536
2500 36/43 609/607
2800 40/48 676/677
3100 45/53 761/748
3400 49/58 829/818
*


First figure pertains to hand nail, second figure


pertains to nail gun
NOTE: In no case should the amount of ridge exhaust
ventilation exceed the amount of soffit ventilation.



With this being presented, the length that you install depends on personal taste and asthetics, also what is defined in your contract.

Those who only aspire to meet Minimum Specifications are doomed to eventually be labeled disingenuous as far as the longevity and quality of performance.

It has been stated that; Those who only perform to Minimum Code, (or Minimum Specifications), are those that barely recieved a passing grade.

Congratulations!!!

That Grade is a D-Minus.

Strive to offer more and your reputation will preceed your proposal.

Ed
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Old 09-27-2008, 10:02 PM   #18
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Re: Ridge Vent Industry Question


Quote:
Originally Posted by Ed the Roofer View Post
Those who only aspire to meet Minimum Specifications are doomed to eventually be labeled disingenuous as far as the longevity and quality of performance.


It has been stated that; Those who only perform to Minimum Code, (or Minimum Specifications), are those that barely recieved a passing grade.

Congratulations!!!

That Grade is a D-Minus.

Strive to offer more and your reputation will preceed your proposal.


Ed
Example being my most recently install of 48' on a 17 sq roof, where the customer originally requested minimum code allowance?

Choose your admonations carefully!
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Old 09-27-2008, 10:06 PM   #19
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Re: Ridge Vent Industry Question


2 story home, mile of the beach, nothing breaking the weather. Vents were taking in some water,[ceiling stain ] each winter. Funny We did fine without these a loota years!
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Old 09-27-2008, 10:14 PM   #20
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Re: Ridge Vent Industry Question


Quote:
Originally Posted by wizendwizard View Post
Example being my most recently install of 48' on a 17 sq roof, where the customer originally requested minimum code allowance?

Choose your admonations carefully!
You were not the target of the critiquing.

I only quoted your post, due to the Minimum criterial recommendations suggested in the ventilation advice posted from that site.

48 feet of Exhaust ventilation certainly achieved a credible and significant improvement on the home owners request.

Per chance, did you have the opportunity to upgrade his Intake Ventilation at the same time, or as a work in progress change order to upgrade his specifications?

Ed

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