Ridge Vent Industry Question

USER8493893

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?

SLSTech

If in doubt - read the directions

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MALCO.New.York

NEVER to the end.

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Lou the roofer

i usually run it about 1.5-2 feet from the end.

Kgmz

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.

johnk

What he said,looks way better

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johnk

What he said,looks way better

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MALCO.New.York

I do not disagree with running the vent to the ends. Just not cutting.

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Ultimate Wisdom---------
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Ed the Roofer

Thats how I train our guys to do it too.

Ed

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RooferJim

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".

RooferJim
www.jbennetteroofing.com

USER8493893

never! directions are over rated!

mattp

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.

tinner666

Always to the end. End is uncut and shingle tops overlap. Silly to put any cap under the vent.

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Roofsafe

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

tinner666

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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wizendwizard

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.

2.

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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wizendwizard

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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"If you start the grout process over, you too could use sparkly grout!"
There is no such thing as an illegal immigrant, they are either illegal or immigrants.
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Driftwood

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!

Ed the Roofer

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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